Numbuzin No.5 Glutathione Vitamin Tone-up Sun Serum 30ml

Values checked: 100% Genuine (Adilsons sourcing policy) · Fragrance-Free (no Parfum/Fragrance entry or named EU allergen found in the declared INCI) · Vegan-Friendly* · Halal status flagged, not badged (see Section 26) · Pregnancy safety reviewed, not flagged (see Section 33D). We did not badge "FA-Safe" outright — see Section 30B for why this is FA-Conditional instead.

PIH vs PIE: the niacinamide/glutathione angle here targets PIH (brown/melanin-based dark marks) through melanosome-transfer inhibition and daily UV protection that prevents new pigment from forming — it does nothing for PIE (red/pink marks from damaged capillaries), which needs centella, azelaic acid, or time instead.

Pros: genuinely fragrance-free for a sunscreen; lightweight serum texture reported as non-greasy by early reviewers; doubles as a light tone-up base under makeup; sits in a well-documented sub-line (No.5) with several in-catalog companion actives. Caveats: the "Glutathione" and "Vitamin" name-ingredients are trace-dosed, not the product's real strength; contains a non-trace amount of drying Alcohol Denat.; as of this writing this exact SKU is out of stock at Adilsons (see Section 38 for in-stock alternatives while it restocks).

This is a single leave-on step: no rinsing, no measuring beyond the two-finger rule, and no wait time before the rest of your morning. It qualifies as bedside-adjacent for mornings when a full routine feels like too much — cleanser (or a splash of water) plus this sunscreen alone is a legitimate two-product minimum-viable AM routine.

Because it contains Alcohol Denat., it can feel slightly tingly on freshly-cleansed, barrier-compromised skin during low-energy flare periods — if that happens, apply over a thin layer of plain moisturizer instead of directly onto bare skin.

Step 1 — When: AM only, as the final step before makeup or sun exposure. Step 2 — How much: the two-finger rule (roughly 1.25ml) for the face alone, plus a little extra for the neck. Step 3 — How: press and pat into clean, dry-to-slightly-damp skin until it sets to a soft matte-satin finish; do not rub it in like a lotion.

Introduce this as the ONLY new product in your routine. Wait a full 14 days before adding anything else. This isolation window ensures you can identify whether any reaction is caused by this specific product.

1) Gentle cleanser or water rinse. 2) Toner/essence layer of choice (optional — see Section 8B for the full map). 3) Any treatment serum (e.g. a No.5-line brightening pad or serum). 4) Lightweight moisturizer if your skin runs dry. 5) numbuzin No.5 Glutathione Vitamin Tone-up Sun Serum, two-finger rule, as the final step. In Mauritius humidity, humectant layers underneath (glycerin, propanediol, butylene glycol) draw moisture from the humid air itself rather than pulling it from deeper skin, so this sunscreen sits on top of already-plump skin rather than a dehydrated base.

This product carries no photosensitizing actives itself, but it IS the sunscreen step — skipping it defeats the purpose of every brightening product layered underneath it, since unprotected UV exposure re-triggers the exact pigment production niacinamide and glutathione are meant to calm.

This is an AM-only product and has no role in a PM routine. In the evening, remove it thoroughly with an oil or balm cleanser first (its silicone-forward, film-forming texture needs an oil-based first cleanse), followed by a water-based second cleanse, then continue your normal PM actives.

Squeeze a line of sunscreen along your index and middle fingers. This is approximately 1.25ml — the amount needed for your face alone.

Technique: pat and press rather than rub — rubbing generates friction that can smear the UV filter film unevenly and reduce real-world protection. Apply to dry or lightly-damp skin (not soaking wet) so the film sets evenly. Hands deliver 100% of product; cotton pads absorb approximately 30-40%, so always apply this with clean hands, never a pad.

This is an encyclopedia map of all product types. You do not use all of these daily. You select modules based on your skin state.

Global rules: viscosity ladder runs thinnest to thickest, water-phase before oil-phase, treatments before seals. Wait-time defaults: watery layers 10-20s, serum layers 30-60s, 10-15 minutes before sunscreen if you're layering several serums underneath it. Default amounts: watery toner/essence 5-8 drops per layer; serum/ampoule 2-3 drops or 1 pump; eye product ½ rice-grain per eye; gel moisturizer 1-1.5 peas, cream 1-2 peas; occlusive seal rice-grain to pea-size; sunscreen — two-finger rule for face, +1 finger for neck. Hydrators sit best on slightly damp skin; retinoids need fully dry skin; exfoliating acids depend on tolerance. If the routine pills, stings, or feels heavy, reduce layers, not increase.

AM Maximum Stack: 1) Rinse/gentle cleanse (optional) 2) pH-prep toner (optional) 3) Hydrating toner layers (optional) 4) Essence (optional) 5) Mist (optional) 6) Booster/soothing serum (optional) 7) Antioxidant lane — choose one (optional) 8) Pigment-support lane — choose one, e.g. a No.5-line pad/serum (optional) 9) Hydration serum lane (optional) 10) Oil-control/sebum lane (optional) 11) Peptide/repair lane (optional) 12) Eye cream (optional) 13) Moisturizer 14) Optional sealing layer (only if dry/AC) 15) Sunscreen SPF50+ PA++++ — this product, non-negotiable, two-finger rule, wait 10-15 minutes before makeup or sweat exposure, reapply every 2 hours outdoors 16) Lip SPF (optional). In AM, prioritize comfort and SPF adherence over stacking — in high humidity, fewer layers often perform better.

PM Maximum Stack: 1) Micellar pre-cleanse (optional) 2) Oil cleanser/balm (to remove this sunscreen's film) 3) Water cleanser (second cleanse) 4) pH-prep toner (optional) 5) Hydrating toner layers (optional) 6) Essence (optional) 7) Soothing/barrier serum (optional) 8) Anchor active of your choice (retinoid, acid, or Vitamin C lane — not this product, which is AM-only) 9) Targeted serum (optional, non-conflicting only) 10) Moisturizer 11) Sleeping mask (optional) 12) Occlusive seal (optional) 13) Spot treatment/patch (as needed) 14) Lip sleeping mask (optional). Do not layer retinoids with AHA/BHA in the same night; keep "one lane" per night.

This sits at the top of the viscosity ladder as the final leave-on film — a watery-to-light-serum texture that is nonetheless the LAST step, applied after every thinner hydrating layer and any lighter moisturizer. Apply it over, never under, your moisturizer.

Its formula runs on a silicone-and-ester emulsion base (Dimethicone, Caprylyl Methicone, Polymethylsilsesquioxane, Polysilicone-15) rather than a pure water-phase gel, which is what gives it a fast-setting, non-tacky film once absorbed rather than a lingering wet feel.

Before starting this product, your routine should already include a gentle cleanser and a basic moisturizer — sunscreen is not a substitute for either. Without a moisturized base, chemical UV filters and Alcohol Denat. can feel more drying than intended.

If your skin stings on moisturizer, feels tight within 30 minutes of cleansing, or shows visible flaking, your barrier is below threshold for this alcohol-containing formula — SKIN1004 Madagascar Centella Air-Fit Suncream Light (mineral-only, Zinc Oxide) is a gentler in-catalog starting point.

Fitzpatrick note: the Titanium Dioxide load and "tone-up" whitening effect can sit visibly ashy or grey-cast on deeper Fitzpatrick IV-VI tones until it fully sets (5-10 minutes); pressing rather than rubbing, and allowing the full set time before judging the cast, reduces this.

UV protection: SPF50+ PA++++ broad-spectrum coverage from a hybrid Titanium Dioxide + four-filter chemical system — this is the product's real, well-evidenced job. Tone evening (PIH, cosmetic + preventive): Niacinamide (position 11 of 44 in the INCI, plausibly a real dose) inhibits melanosome transfer to keratinocytes, and daily SPF prevents new UV-triggered pigment; Glutathione and Adenosine are present but at likely trace concentration, so treat their brightening contribution as a bonus, not the main mechanism.

What this product cannot do: it cannot lighten your natural skin tone — "tone-up" means a temporary cosmetic soft-focus cast plus genuine UV-driven pigment prevention, not a permanent change to your baseline complexion. It also cannot replace a dedicated dark-spot treatment serum if PIH is your primary concern — see Section 37 for pairing options built for that job specifically.

Every recommendation below is verified in our live catalog as of 2026-09-16. Because this exact sunscreen SKU is currently out of stock, these pairings assume you already own a bottle or are building a routine around it for when it restocks.

Primary pairing — numbuzin No.5 Vitamin-Niacinamide Concentrated Pad: same No.5 brightening lane, used as an AM toning-pad step before this sunscreen, reinforcing the niacinamide dose this sunscreen only contributes in a supporting amount.

Alternatives: numbuzin No.5 Vitamin Concentrated Serum (a leave-on treatment serum for the same PIH lane, used before this sunscreen), numbuzin No.5 Glutathione TXA Advanced Dark Spot Ampoule Concentrate (a stronger dark-spot-focused ampoule for the same routine), and numbuzin No.5+ Glutathione Vitamin Concentrated Mask (a weekly sheet-mask boost, PM use, not a same-routine layering partner).

Pilling risk: layering multiple silicone-forward products (this sunscreen plus a silicone-heavy primer or moisturizer) can pill. Mitigate by waiting a full 60 seconds after your moisturizer sets before applying this sunscreen, and pat rather than rub.

Assessment: Film-Forming (uncertain). This sunscreen's silicone-and-ester base (Dimethicone, Caprylyl Methicone, Polymethylsilsesquioxane) is designed to sit on the skin surface as a water-resistant, even film — that is precisely what makes it function as sun protection, but it means water may not reach the skin surface underneath during ablution.

If strict water-permeability matters to you, remove with a gentle cleanser before wudu and reapply after, or apply after your prayer window for that block of the day.

Adilsons provides this assessment based on the product's physical properties. Rulings on wudu validity vary between scholars. Consult your own trusted Islamic authority.

MYTH: "A sunscreen with 'Glutathione' in the name will visibly whiten my skin over time." REALITY: based on the INCI list we found, Glutathione sits at the very last ingredient position — a trace/marketing-level inclusion, not a treatment dose; the product's real, evidenced job is UV protection plus a temporary cosmetic tone-up cast.

MYTH: "Tone-up sunscreens work like foundation and replace makeup." REALITY: the cast is a soft-focus, light-diffusing effect from Titanium Dioxide, not color-matched pigment coverage — it evens the appearance of tone, it does not conceal texture or discoloration the way a foundation does.

Sugar cane burning season (Jul-Nov): PM2.5 rises during harvest burns. This sunscreen's Hippophae Rhamnoides (sea buckthorn) Water/Oil — genuinely the first ingredient by list position — provides a real, if unquantified, antioxidant base that offers some incidental pollution-defense support alongside its UV role.

*Glutathione and Adenosine appear below the estimated 1% line in the INCI list, suggesting they are present at a trace/sub-efficacious concentration. Their inclusion may be primarily for marketing rather than clinical effect.

Full INCI (sourced from cross-corroborated third-party retailer/ingredient-database listings — the same 44-item list came back verbatim across three independently-phrased searches, though direct-fetch confirmation from a primary source was blocked in this research session): Hippophae Rhamnoides Water, Water, Diisopropyl Sebacate, Titanium Dioxide (CI 77891), Propanediol, Butylene Glycol, Butyloctyl Salicylate, Dibutyl Adipate, Ethylhexyl Triazone, Terephthalylidene Dicamphor Sulfonic Acid, Niacinamide, Alcohol Denat., 1,2-Hexanediol, Tromethamine, Dimethicone, Hippophae Rhamnoides Oil, Caprylyl Methicone, Diethylamino Hydroxybenzoyl Hexyl Benzoate, Polymethylsilsesquioxane, Polysilicone-15, Isododecane, Octyldodecanol, Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine, Pentylene Glycol, VP/Eicosene Copolymer, Polyglyceryl-3 Distearate, Potassium Cetyl Phosphate, Cetearyl Alcohol, Glyceryl Stearate, Dimethicone/Vinyl Dimethicone Crosspolymer, Polyglyceryl-4 Isostearate, Hydroxyacetophenone, Methylpropanediol, Polyester-5, Isopropyl Titanium Triisostearate, Aluminum Hydroxide, [--- Estimated 1% Line ---] Polyglyceryl-10 Myristate, Carbomer, Glyceryl Stearate Citrate, Adenosine, Hydroxypropyl Methylcellulose Stearoxy Ether, Sodium Polyacryloyldimethyl Taurate, Xanthan Gum, Glutathione.

Preservative system: 1,2-Hexanediol and Pentylene Glycol — both glycol-type multifunctional preservative-boosters, a gentler preservative approach than parabens or formaldehyde-releasers, though not a stand-alone broad-spectrum preservative on their own; Hydroxyacetophenone (an antioxidant/preservative-booster) is also present.

Fragrance status: Fragrance-Free. No Parfum/Fragrance entry appears in the disclosed INCI, and no named EU 26 allergen (Linalool, Limonene, Citral, Geraniol, Eugenol, Coumarin, etc.) was detected in the list we found — unusual and worth noting for a sunscreen, where fragrance is common.

Scent: not specifically described in the research we found; expect a mild, non-perfumed cosmetic base scent typical of silicone-forward sunscreens.

Alcohol disclosure: contains Alcohol Denat. (ethanol-type, not a fatty alcohol) at INCI position 12 of 44 — a non-trace list position, meaningful enough to contribute to its fast-absorbing finish and to irritation risk on reactive skin. Cetearyl Alcohol also present, but that is a fatty alcohol (moisturizing, not drying).

Halal: we are deliberately NOT using our standard "no ethanol detected" self-assessed Halal badge here, because this formula DOES contain Alcohol Denat. (an ethanol-type alcohol) at a non-trace position.* No porcine- or otherwise haram-flagged animal-derived ingredients were found in the declared INCI, but the alcohol content means this SKU needs its own individual consideration rather than a blanket brand-wide assumption.

*Self-assessed by Adilsons based on available INCI data; this is NOT a formal Halal certification, and given the disclosed Alcohol Denat. content, Muslims following stricter alcohol-avoidance positions should consult their own scholars before use.

Vegan: no animal-derived ingredients were detected in this SKU's declared ingredient list.*

*Self-assessed by Adilsons based on available INCI data. This is NOT a formal vegan certification by The Vegan Society or equivalent body.

Cruelty-free: numbuzin describes itself as committed to cruelty-free production.*

*Brand-stated policy. Not independently certified by Leaping Bunny, PETA, or an equivalent third-party audit. Whether numbuzin sells through Mainland China retail — which can legally require post-market animal testing — has not been independently resolved in our research to date.

Reef safety (26D): free of Oxybenzone and Octinoxate based on the declared INCI — the product's chemical filters are Ethylhexyl Triazone, Terephthalylidene Dicamphor Sulfonic Acid, Diethylamino Hydroxybenzoyl Hexyl Benzoate, and Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine, none of which are on the commonly-cited reef-harm filter list, though independent reef-safety data on these specific newer filters remains limited.

Microplastic status: no named film-forming microplastic polymers (e.g. Polyethylene, Nylon-12) detected. It does contain several silicone-based texturizers (Dimethicone, Caprylyl Methicone, Polymethylsilsesquioxane, Polysilicone-15, Dimethicone/Vinyl Dimethicone Crosspolymer) — not classified as microplastics under current EU/ECHA rules, but disclosed here plainly rather than glossed over.

No evidence was found that this specific SKU carries MFDS Functional Cosmetic certification (the Korean government's additional testing tier); treat brightening/whitening language as General Cosmetic marketing claims rather than government-verified functional claims unless you find otherwise on the box.

Whitening translation: the Korean "미백" (mibaek) classification, where it genuinely applies to a product, means regulation of melanin production — fading dark spots toward your natural tone — not bleaching or changing your natural complexion. We found no independently-verifiable, SKU-specific clinical trial (institution, sample size, percentage result) for this exact Sun Serum; a widely-cited clinical figure exists for the separate No.5+ Vitamin Concentrated Serum, but that is a different product and we are not attributing its results to this one.

Evidence confidence: Marketing-Only* for the brightening claims specifically, given the trace list position of Glutathione and the absence of SKU-specific clinical data; Medium for the SPF50+ PA++++ claim itself, which rests on an established, multi-filter formulation approach even though we could not independently verify the exact broad-spectrum test result.

*No independently-verifiable clinical or in-vitro study was found for this SKU's brightening claims; treat "brightening" language as brand marketing copy rather than evidence-backed until a specific study surfaces.

This is a five-filter, next-generation hybrid system rather than the older oxybenzone/avobenzone/octinoxate combinations — it is reasonable to expect solid broad-spectrum, photostable coverage, though we could not independently verify a specific Critical Wavelength test result for this exact SKU.

White cast: low-to-moderate on light-to-medium tones, more visible on deep tones until fully set (see Section 13B). Eye sting risk: Moderate — in Mauritius heat, sweat can carry the Alcohol Denat. and chemical filters into the eyes; one reviewer specifically reported watery eyes. Avoid within 1cm of the orbital bone. Reapply every 2 hours of sun exposure — a full day outdoors in Mauritius requires 3-4 reapplications.

FA safety: FA-Conditional. The formula contains several polyglyceryl fatty-acid esters (Polyglyceryl-3 Distearate, Polyglyceryl-4 Isostearate, Polyglyceryl-10 Myristate) plus Glyceryl Stearate, Glyceryl Stearate Citrate, and Potassium Cetyl Phosphate — esters that some fungal-acne-prone users react to, though esters are less reliably problematic than free fatty acids. If you're fungal-acne-prone and reactive to numbuzin's other No.5/No.9 formulas, patch test this one too rather than assuming it's safe by association.

Assessment: Low-to-Medium. The silicone base (Dimethicone, Caprylyl Methicone, Polymethylsilsesquioxane) sets to a smooth film on its own, but stacking it over another heavy-silicone primer or moisturizer, or over unabsorbed watery layers, can cause pilling.

Mitigation: apply to lightly damp (not wet) skin, wait roughly 60 seconds after your moisturizer before this step, and pat rather than rub it in.

Fresh color should be a uniform white-to-off-white emulsion; any yellowing, separation that won't remix on shaking, or a sour/off smell signals the formula has broken down and should be discarded rather than used.

Mauritius storage note: keep out of direct heat and away from a hot bathroom shelf or car glovebox — the silicone emulsion and organic UV filters can destabilize faster in sustained heat above roughly 30°C. When in doubt, discard.

Patch test on the inner forearm for 24 hours, then behind the ear for 24 hours, before applying to the full face — this matters more than usual here given the Alcohol Denat. content and four-filter chemical UV system.

If adverse reaction: STOP ALL ACTIVES. For 72 hours, use ONLY gentle cleanser plus plain moisturizer plus a mineral-only SPF. NO acids, retinoids, Vitamin C, exfoliants, or essential oils. After 72 hours, reintroduce ONE product per 14 days. Emergency stop signals (seek care immediately): hives, swelling, blistering, persistent burning, or breathing difficulty.

1) Applying too little — most people under-dose sunscreen by half; use the full two-finger rule. 2) Skipping reapplication because "it's SPF50+" — the number describes peak protection at full, fresh application, not an all-day guarantee. 3) Rubbing it in like a lotion instead of pressing — this can disturb the UV filter film. 4) Applying directly onto bare, un-moisturized skin and blaming the sunscreen for stinging that's actually the Alcohol Denat. meeting a dry barrier. 5) Assuming the "Glutathione" name means a whitening treatment strength — see Section 23 for why that's not supported by the INCI position.

Overuse threshold: there isn't one in the usual sense for daily SPF — the real risk is under-use (skipping reapplication), not overuse.

At roughly 1.25ml per full-face application (the two-finger rule), a 30ml bottle provides approximately 20-24 full-face uses before neck and reapplications are counted — noticeably fewer than the "months" framing sunscreens often get, because correct dosing uses far more product per use than people assume.

If you also reapply midday (recommended every 2 hours outdoors), expect the bottle to run out faster than once-daily-only use — budget for a second bottle or a companion sunscreen for reapplication if you're outdoors most of the day. Using the correct dose from day one (rather than under-dosing to stretch the bottle) is the only way to get real SPF50+ protection out of it, even though it means reordering sooner.

This sunscreen closes out a brightening-focused AM routine built around the numbuzin No.5 line — its job is UV protection with a light tone-up finish, sitting as the final, thinnest-to-thickest step after every other AM layer.

AM: 1) Cleanse/rinse 2) numbuzin No.5 Vitamin-Niacinamide Concentrated Pad (toning step) 3) Lightweight moisturizer 4) numbuzin No.5 Glutathione Vitamin Tone-up Sun Serum — two-finger rule, pat into skin, wait 10-15 minutes before makeup.

If you're spending the whole day outdoors, carry a second, more portable sunscreen for the 2-hourly reapplications rather than trying to stretch one 30ml bottle across a full beach day. If your skin is barrier-compromised right now, use the mineral-only SKIN1004 Air-Fit Light alternative (Section 12) until it recovers, then return to this one. If you're in the sugar cane burning season (Jul-Nov), its sea buckthorn base gives a small incidental antioxidant boost against the added particulate load, but it is not a substitute for a dedicated antioxidant serum if pollution exposure is a real daily concern for you.

Stock-true bundle idea: numbuzin No.5 Vitamin-Niacinamide Concentrated Pad + numbuzin No.5 Vitamin Concentrated Serum + this Sun Serum forms a complete AM brightening-and-protection lane, all from the same numbered sub-line, all independently verified active in our catalog as of 2026-09-16.

After purchasing, you will receive our skincare education email series covering this product in depth.

The recommendations above are based on formulation synergy with numbuzin No.5 Glutathione Vitamin Tone-up Sun Serum, not on margin or stock levels. If a pairing does not exist in our catalog, we say so. If you already own a product that fills the same role, use what you have first.

Because this exact SKU currently shows zero inventory in our system (as of 2026-09-16), here are four verified in-stock alternatives if you need a tone-up or hybrid sunscreen today rather than waiting on a restock.

Primary alternative — numbuzin No.1 Clear Filter Sun Essence SPF50+ PA++++: same brand, a five-filter chemical essence built with soothing botanicals (Licorice Root Water, Centella, Houttuynia Cordata) rather than a tone-up cast — trade the brightening finish for a calmer, non-tinting formula.

Alternatives: SKIN1004 Madagascar Centella Tone Brightening Tone-Up Sunscreen (the closest direct comparable — also a hybrid Titanium Dioxide + chemical tone-up formula, built around Centella instead of sea buckthorn/glutathione), Beauty of Joseon Relief Sun: Rice + Probiotics (a bestselling four-filter chemical sunscreen, no tone-up cast, currently our highest-stock sunscreen option), and numbuzin No.9 NAD+ 9 Peptides Dewy Sun Essence (same brand, peptide/anti-aging lane instead of brightening).

Choose numbuzin No.5 Glutathione Vitamin Tone-up Sun Serum over SKIN1004's Tone-Up Sunscreen if you specifically want to stay within the numbuzin No.5 sub-line for routine consistency, or you prefer a fragrance-free formula (SKIN1004's tone-up sunscreen's fragrance status was not independently re-verified this pass) — otherwise the two are genuinely comparable hybrid tone-up formulas.

IF you are fragrance-sensitive, THEN this product's confirmed fragrance-free status is a real advantage. IF you are alcohol-sensitive or currently barrier-compromised, THEN do not upgrade to this one yet — the mineral-only SKIN1004 Air-Fit Light (Section 12) is the safer starting point.

Don't upgrade if: your barrier is currently compromised; you can't reliably commit to twice-daily reapplication outdoors; or you're already running another numbuzin No.5 product and don't need a second brightening-adjacent SPF layer right now.

If you match the fragrance-free or sub-line-consistency triggers above, this is worth choosing. If not, the SKIN1004 alternative is equally sufficient. Consistency beats complexity.

This product's PRIMARY function is: daily broad-spectrum UV protection with a light tone-up finish. You do NOT need this if you already own an in-date, unopened, or barely-used SPF50+ PA++++ sunscreen you're happy with — finish that one first, since sunscreen's PAO clock runs whether or not you're using two bottles at once.

Stacking assessment: No Benefit if you're already using another SPF daily — running two sunscreens in the same routine doesn't add protection beyond the higher-rated one. Marginal Benefit if you're switching specifically for the fragrance-free or tone-up-finish angle described above.

This product is sourced through authorized Korean distributors — primarily Craver Co., Ltd (South Korea), alongside other verified distribution partners. Craver is a major Korean beauty distributor and the parent company of SKIN1004, handling authorized distribution for multiple K-beauty brands. All products are shipped directly to Mauritius via verified channels.

For comprehensive information about how we verify authenticity, our layered verification system, and how to check your product at home, visit our dedicated Authenticity and Trust page.

Quick verification tips: genuine numbuzin packaging uses crisp, evenly-printed "Made in Korea" text with no blurring or misspelling — poor print quality on this line is one of the most commonly cited fake markers across other numbuzin SKUs we've researched. Compare batch code placement and box seal against a known-genuine unit if you have one, and when in doubt, check with us via WhatsApp before use.

numbuzin is a South Korean skincare brand founded in 2019, built around a "What's Your Number?" system — numbered product lines (No.1 through No.9+) where each number targets a distinct skin goal rather than a single overarching hero ingredient. The No.5 line specifically centers on Vitamin-Niacinamide/Glutathione brightening and dark-spot care, of which this Sun Serum is the UV-protection entry.

Across the numbuzin SKUs we've researched to date, a consistent formulation pattern shows up: the headline, name-giving active (whether that's Glutathione here, NAD+ on the No.9 line, or PDRN elsewhere) tends to sit at a trace INCI position, while a steadier supporting active — usually Niacinamide or Adenosine — carries more of the real functional load. We disclose this plainly on every numbuzin page rather than repeating the marketing framing uncritically.

Community reviews specifically for this exact SKU were limited in our research at the time of writing — we found a small number of retailer-hosted reviews (via YesStyle) but no dedicated Reddit (r/AsianBeauty, r/SkincareAddiction) discussion thread for this Sun Serum specifically, unlike some other numbuzin products we've researched.

One reviewer (skin type not specified) described seeing the tone-up effect working within just two days of use and called it "a really good sunscreen that feels lightweight" with a nice glow finish. A second reviewer, who described sensitive eyes, reported the product made their eyes "really watery" — plausibly linked to the Alcohol Denat. and multi-filter chemical UV system discussed in Section 28's eye-sting assessment.

Common themes so far: praise centers on the lightweight, fast-absorbing texture and visible glow; the one complaint we found centers on eye-area sensitivity rather than breakouts, dryness, or pilling. This is a thin sample — treat it as a starting point, not a verdict, and patch test regardless.

Sustainability: check the tube and carton for local recycling symbols at time of purchase; refillable status not confirmed for this SKU.

Does this actually whiten my skin? No. It gives a temporary cosmetic tone-up cast from Titanium Dioxide and helps prevent new UV-triggered pigment, but it does not bleach or permanently lighten your natural skin tone.

Can I use it under makeup? Yes — its lightweight serum texture is designed to sit comfortably under makeup and can also double as a light tone-up base on its own.

How often do I need to reapply? Every 2 hours of continuous sun exposure, and after heavy sweating or swimming — the same rule as any sunscreen, regardless of its SPF number.

Is the "Glutathione" in the name actually going to fade my dark spots? Based on its position at the very end of the disclosed ingredient list, it's unlikely to be the main driver — pair this sunscreen with a dedicated No.5-line treatment serum (Section 15) if dark-spot fading is your real goal.

Is it safe for sensitive or reactive skin? Use caution — it contains a non-trace amount of Alcohol Denat. and four chemical UV filters. Patch test first, and consider the mineral-only SKIN1004 alternative (Section 12) if you know you react to alcohol-containing sunscreens.

Tone-up sunscreen

A sunscreen with added light-diffusing pigment (usually Titanium Dioxide) that gives skin a brighter, softer-looking cast on top of its UV protection.

PA++++

The Korean/Japanese rating for UVA protection strength; ++++ is the highest tier.

Hybrid sunscreen

A formula combining a physical/mineral filter (like Titanium Dioxide) with chemical/organic filters in one product.

Estimated 1% line

The point in an ingredient list, based on cosmetic-chemistry list-order rules, below which ingredients are estimated to be present at under 1% concentration.

Fairy dusting

Including a marketable ingredient at such a low concentration it's unlikely to have a meaningful effect, mainly for the name/label appeal.

PIH

Post-inflammatory hyperpigmentation — brown/dark marks left after acne or injury, caused by excess melanin.

Alcohol Denat.

Denatured ethanol, used in cosmetics as a fast-drying solvent; can be drying/irritating in non-trace amounts on sensitive skin.

MFDS

Korea's Ministry of Food and Drug Safety, which certifies certain cosmetics as "Functional" after additional testing.

Every product sold by Adilsons Beauty is 100% genuine, sourced through authorized Korean distribution channels. Full details on our verification system: Authenticity and Trust.

Our team is available to help you build a routine, troubleshoot reactions, and answer ingredient questions. WhatsApp: +230 5 778 2336.

For in-depth skincare education, visit our blog at adilsons.mu/blogs/k-beauty or subscribe to our email to get our guided education series delivered to your inbox.

Coverage: Island-wide delivery (Mauritius).

Processing and Timing: Orders process in 1-2 business days; usually ready by Day 3 for pickup by our delivery partners/regional team. Partner collection can take up to 1 week. After pickup, delivery typically takes 1-5 business days (weekdays only).

Express: May be available by region; request on WhatsApp: +230 5 778 2336.

Liquids/Sensitive Items: Serums, toners, liquid makeup (and kits containing liquids) are pickup or door-to-door only; checkout enforces this.

Scheduling: Deliveries run by region on set schedules; we will contact you the evening before.

Pickup: Citadelle Mall pickup available.

Returns: No change-of-mind exchanges.

Refunds (Summary): For defective/damaged on receipt (report within 48h), wrong item, or manufacturing defect within 6 months. Refunds via bank transfer (7-10 business days); card refunds may incur a 5% processor fee (fee not charged for defects/order errors). Opened skincare/personal-care items are non-returnable (except if damaged on delivery).

Source of Truth: This is a quick snapshot. If anything differs, the policy pages are final.

Store Policies: For the most up-to-date information, please review our Shipping Policy and Refund Policy.

Best for: numbuzin No.5-line users who want a fragrance-free, lightweight, hybrid tone-up sunscreen to close out their AM routine, and who don't have a known sensitivity to alcohol-containing formulas.

Key benefits: genuine fragrance-free status (rare for a sunscreen); a well-rounded five-filter hybrid UV system; a real (if unquantified) sea buckthorn antioxidant base; fits neatly into an existing No.5-line brightening routine.

Keep in mind: the "Glutathione" name-ingredient is trace-dosed, not a treatment-strength active — don't buy this expecting it to fade dark spots on its own; it contains a non-trace amount of Alcohol Denat., worth a patch test if you're reactive; and this exact SKU is currently out of stock at Adilsons, so see Section 38 for verified in-stock alternatives in the meantime.

Assessment: Consult Oncologist. While this formula is fragrance-free, retinoid-free, and uses a relatively minimal glycol-based preservative system, it is a hybrid (not pure-mineral) sunscreen with four chemical UV filters and a non-trace amount of Alcohol Denat.

Treatment-sensitized skin is frequently more reactive to alcohol and to chemical UV filters specifically; a 100%-mineral option (see the SKIN1004 alternative in Section 12) is often the more conservative starting choice during active treatment.

Consult your oncology care team before introducing any new skincare products during treatment.

Antioxidant pollution defense: Hippophae Rhamnoides (sea buckthorn) Water is the very first ingredient by list position, meaning a genuinely substantial, non-fairy-dusted base — sea buckthorn is naturally rich in carotenoids and tocopherols, giving this sunscreen a real, if unquantified, antioxidant contribution on top of its UV-filter role, distinct from the trace Glutathione callout elsewhere on this page.

Sweat resistance and humidity performance: no water-resistance rating (e.g. "80-minute water resistant") was found disclosed for this SKU — treat it as needing reapplication after swimming or heavy sweating rather than assuming water resistance, and reapply on the standard 2-hour outdoor schedule regardless.