Medicube ROSEYMARY PDRN SCALP SERUM 20ml

100% Genuine (Adilsons policy). Fragrance-Free: No. Vegan-Friendly: No (PDRN is salmon-derived, and Hydrolyzed Collagen is present). FA-Conditional: yes, this is the most leave-on-relevant of the three products in the line — see Sensory and Chemical Profile. Note on the product name: the live listing spells this "ROSEYMARY" rather than "Rosemary" — a genuine spelling error on the live product page (matching the correct spelling used by its Shampoo and Conditioner siblings), not a deliberate variant name; we've flagged it internally but have not altered the product title.

Pros: real, disclosed Caffeine concentration; genuine physical spicule mechanism for micro-exfoliation; cooling rollerball applicator well-suited to Mauritius heat; completes the in-stock Rosemary PDRN trio.

Caveats: the brand's own headline ingredient, PDRN, is disclosed at only 100ppb — a genuinely trace, almost certainly non-functional dose; "EGF" is marketed prominently but could not be matched to a specific confirmed INCI entry in this research; Alcohol Denat. sits at the 2nd INCI position, an unusually high placement for a leave-on scalp product and a real drying/irritation consideration on sensitized skin.

Classification: RED — not recommended for a child or tween's scalp without guidance. This serum combines undisclosed-concentration Salicylic Acid and Glycolic Acid with physical spicule (mechanical) micro-exfoliation and a high-position Alcohol Denat. — a genuinely active-strength leave-on combination, even though none of these individually crosses this store's hard pediatric-gate threshold.

Safe alternatives: the line's rinse-off Cooling Thickening Shampoo and Hair & Scalp Conditioner are both verified in stock and are gentler, rinse-off formats more appropriate for a younger scalp than this leave-on serum.

Step 1 — When: PM or AM, 2-4x weekly, on towel-dried (damp or dry) scalp after shampooing. Step 2 — How much: roll along the parted scalp in sections, covering temples, crown, and hairline as needed — roughly 5-8 rolls total. Step 3 — How: part hair, roll the applicator directly on the scalp, gently massage in with fingertips until absorbed; do not rub vigorously.

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.

Rest days: at least 2-3 rest days weekly are recommended given the undisclosed-concentration acid pair plus physical spicule exfoliation — this is not a daily product for most users. Overuse warning: exceeding 4x weekly does NOT produce faster results — it risks scalp irritation, especially combined with the high-position Alcohol Denat. in this formula.

Before starting this product, your routine should already include a working shampoo/conditioner step — this serum is a targeted add-on, not a foundation.

Barrier gate: if your scalp currently stings when you apply the conditioner, feels tight, or shows visible flaking beyond normal dandruff, start with the rinse-off Cooling Thickening Shampoo alone for 1-2 weeks before adding this leave-on serum.

Scalp buildup and flaking: Salicylic Acid + Glycolic Acid (undisclosed %) plus physical spicule micro-exfoliation clear surface debris. Scalp fatigue/sluggish feel: Caffeine (marketed ~1%) is a recognized topical stimulant ingredient. Appearance of thin/weak-looking roots: brand-marketed via the full actives complex, though individual-ingredient contribution to this specific claim is not independently broken out.

What this product cannot do: it cannot regrow hair, reverse androgenetic alopecia, or replace a dermatologist-prescribed treatment (minoxidil, finasteride) for diagnosed hair loss — despite "PDRN" branding evoking regenerative-medicine associations, the disclosed 100ppb dose here is not comparable to any clinical procedure.

1. Medicube Rosemary PDRN Cooling Thickening Shampoo 400ml — used right before this serum on wash days, clearing surface buildup so the serum's actives reach clean scalp.

2. Medicube Rosemary PDRN Hair & Scalp Conditioner 250ml — used on lengths/ends the same wash days; keeps hair manageable while this serum focuses on the scalp.

3. Aromatica Rosemary PDRN Scalp Serum 100ml — a same-category alternative from a different brand (plant-derived PDRN, Redensyl, vegan micro-spicules) if you want a larger-volume or vegan-leaning option on off-days.

Pilling pairs: avoid layering a heavy styling product immediately on top of wet serum application — wait until fully absorbed (roughly 1-2 minutes) before any leave-in cream or oil.

Universal rules: run only one primary active lane per routine (this serum's Salicylic Acid + Glycolic Acid pairing already counts as one combined exfoliation lane). If you break a rule, reduce frequency rather than pushing through. Barrier override: if your scalp stings or feels tight, pause all actives and run rinse-off-only for 3-7 days.

Exfoliation Lane Conflicts: this serum's own AHA (Glycolic) + BHA (Salicylic) combination is already a "use one product for this lane" situation — do not add a separate leave-on scalp acid treatment from another brand on the same days. If you use a chemical exfoliating shampoo elsewhere in the week, keep them on separate days rather than the same wash.

Direct Acids × Physical Exfoliation: this serum already combines chemical acids with physical spicules in one product — do not add a separate scalp scrub (like the Aromatica Rosemary Scalp Scrub) on the same day; alternate days instead (scrub one day, serum another).

Scheduling Template — Alternate-Day Protocol: Mon/Fri: full wash + serum. Wed/Sun: serum only. Tue/Thu/Sat: rest, rinse-off products only.

Do not layer this serum with a separate scalp acid or physical scrub on the same day; keep "one exfoliation lane" per scalp session.

MYTH: "This serum delivers the same PDRN dose used in clinical scalp injections." REALITY: the brand's own disclosed figure is 100ppb (0.00001%) — genuinely trace, and not comparable to an injectable procedure dose.

MYTH: "The rollerball applicator is just packaging, not part of how it works." REALITY: the rollerball delivers a real cooling/gua-sha-style massage effect that can support relaxation and product distribution, separate from the chemistry of the formula itself.

MYTH: "More frequent use = faster thickening." REALITY: this formula contains real leave-on acids and physical exfoliation; exceeding 2-4x weekly risks irritation rather than accelerating any cosmetic benefit.

AC environment note: this is not a humectant-heavy formula (no major HA loading disclosed), so the standard AC-dehydration warning is less relevant here than for a facial HA serum.

*FAIRY DUSTING: Sodium DNA (PDRN) appears in this INCI at a brand-disclosed 100ppb — far below any plausible functional threshold, despite being the lead word in the product name. Treat "PDRN" here as a marketing headline, not a meaningful active concentration.

Full INCI (partial reconstruction, confirmed incomplete): Water (Aqua), Alcohol Denat., C12-13 Alketh-9, Caffeine, Dipropylene Glycol, Hydrolyzed Sponge, Ammonium Acryloyldimethyltaurate/VP Copolymer, Menthol, Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Fragrance (Parfum), Allantoin, Aminomethyl Propanol, Disodium EDTA, Dipotassium Glycyrrhizate, Ethyl Menthane Carboxamide, Panthenol, Butylene Glycol, 1,2-Hexanediol, Arginine, Gluconolactone, Menthyl Lactate, Ricinus Communis (Castor) Seed Oil, Sodium DNA (100ppb), [--- Estimated 1% Line ---] Glycerin, Glycolic Acid, Saccharide Isomerate, Raphanus Sativus (Radish) Seed Extract, Octyldodecyl Oleate, Octyldodecanol, Hydrolyzed Pea Protein, Hydrolyzed Vegetable Protein, Biotin, Niacinamide, Salicylic Acid, Caprylic/Capric Triglyceride, Hydrogenated Lecithin, Sparassis Crispa Extract, Streptococcus Thermophilus Ferment, Sodium Palmitoyl Sarcosinate, Magnolia Obovata Bark Extract, Hydrolyzed Collagen, Hydrolyzed Corn Protein, Hydrolyzed Extensin, Hydrolyzed Potato Protein, Hydrolyzed Rice Protein, Hydrolyzed Soy Protein.

This list is confirmed incomplete — every source found cuts off after Hydrolyzed Soy Protein. Rosemary itself was not located by exact INCI name in the portion captured, despite headlining the product name; it may appear later in the full list. Full ingredient list not fully confirmed by the brand at the time of writing.

Preservative system: 1,2-Hexanediol, Disodium EDTA — a standard mild preservative combination.

Fragrance status: Synthetic Fragrance (Parfum) present. Scent description: cooling, menthol-forward (Menthol, Menthyl Lactate, Ethyl Menthane Carboxamide all present — a genuinely strong cooling-agent stack). Intensity: moderate-high (4/5) given three separate cooling agents; dissipation: 1-5 minutes as the serum absorbs. EU 26 allergen screen: none explicitly named by separate INCI entry in the portion captured. The undisclosed Fragrance (Parfum) entry may contain undisclosed allergens. Patch test advised for sensitive individuals. Alcohol disclosure: Drying Alcohol at INCI position 2 (Alcohol Denat., immediately after Water) — an unusually high placement for a leave-on product, and a genuine consideration for anyone with a dry or sensitized scalp.

Halal: *Self-assessed by Adilsons based on available INCI data. PDRN (Sodium DNA) is salmon-derived — fish is generally considered halal-permissible — but this SKU also contains Hydrolyzed Collagen, whose specific animal source (fish, bovine, or porcine) was not independently confirmed in this research. This is NOT a formal Halal certification. Muslims with stricter requirements, particularly around the unconfirmed Collagen source, should consult their own scholars.

Vegan: not vegan. Contains both salmon-derived PDRN (Sodium DNA) and Hydrolyzed Collagen (animal-derived by default absent a specified plant/marine-only source).

Cruelty-free: *Brand-stated policy not independently certified by Leaping Bunny, PETA, or equivalent third-party audit. Medicube sells in mainland China retail through a separate product line; cross-border e-commerce sales to Mauritius may be exempt from mainland China's post-market animal-testing requirements.

Microplastic-Free: Yes — Acrylates/C10-30 Alkyl Acrylate Crosspolymer and Ammonium Acryloyldimethyltaurate/VP Copolymer are water-soluble/swellable rheology modifiers, not solid microplastic beads.

MFDS Classification: not confirmed as Functional Cosmetic — treat as General Cosmetic. Clinical evidence: brand-cited figures (root hair thickness +23.2%, hair softness +44.07%, scalp flakiness -53.2%, visible breakage -67.8% after 4 weeks, attributed to "Global Institute of Dermatological Sciences") were found in press coverage; no independent publication, sample size, or methodology located, and this exact attribution string has previously surfaced for an unrelated Medicube product in prior brand research, which is reason for added caution about treating it as SKU-specific proof. *Marketing-only claim. Evidence Confidence: *Marketing-Only.

Newly launched product line (2026) — no reformulation history applies yet.

FA Safety: FA-Conditional. Contains Octyldodecyl Oleate (an oleic-acid ester, a well-documented Malassezia-feeding trigger by community trackers), Octyldodecanol, and Hydrogenated Lecithin. Because this is a LEAVE-ON scalp product, these carry more real-world relevance than the equivalent esters in the rinse-off shampoo/conditioner siblings — a scalp actively affected by fungal folliculitis should patch test carefully or consult a dermatologist before regular use.

Low — watery serum absorbs quickly. If layering a heavier post-shower leave-in product on top, wait 1-2 minutes for full absorption first to avoid pilling.

Fresh color/scent should be consistent batch to batch. Any notable color shift, separation that won't remix on shaking, or a sour/off smell are spoilage signs. Store away from direct sunlight and high ambient heat — Mauritius bathroom humidity is generally fine, but avoid leaving the bottle in direct sun or a hot car. When in doubt, discard.

Patch test: apply a small amount to a discreet scalp section or behind the ear, leave 24 hours, check for redness/itching/burning before regular use.

If adverse reaction: STOP ALL ACTIVES. For 72 hours, use ONLY a gentle, fragrance-free rinse-off cleanser on the scalp — NO acids, essential oils, or leave-on actives. After 72h, reintroduce ONE product per 14 days.

Emergency stop signals: hives, swelling, blistering, persistent burning, or breathing difficulty — seek emergency care immediately.

Pregnancy and nursing: this serum combines undisclosed-concentration Salicylic Acid and Glycolic Acid with physical spicule exfoliation and a high-position drying alcohol, all in a leave-on scalp product. Neither acid is independently confirmed above the concentration that triggers this store's hard contraindication threshold, so this is not presented as an absolute no — but given the combined acid load and leave-on format, we recommend pregnant or nursing customers consult their doctor before regular use, and consider the rinse-off Shampoo and Conditioner as lower-risk alternatives in the meantime.

Physical exfoliant caution: the Hydrolyzed Sponge spicules provide genuine mechanical micro-exfoliation — do not use on broken, actively inflamed, or bleeding scalp skin, and avoid vigorous rubbing or scratching with the applicator.

1. Using it daily "for faster results" — this formula's acid + physical exfoliant combination doesn't reward overuse. 2. Rubbing the rollerball vigorously instead of rolling gently. 3. Applying to a scalp that's already irritated from another active product. 4. Expecting the disclosed 100ppb PDRN to deliver clinical-injection-level regenerative effects. 5. Skipping the patch test given the multi-acid, drying-alcohol-forward formula.

Overuse threshold: 4x weekly is a reasonable ceiling for most scalps; exceeding this does NOT produce faster results — it risks irritation from the combined acid/alcohol/physical-exfoliant load.

At roughly 5-8 rolls per use and 2-4 uses weekly, a 20ml bottle with a rollerball applicator reasonably lasts 1-2 months for consistent use — this is a small-volume, concentrated product by design. Using excessive product per application doesn't improve results and shortens the bottle's life considerably given the small volume. Reorder roughly 2 weeks before you expect to run out.

This serum is the leave-on, targeted-treatment step of the Rosemary PDRN system — used after the shampoo and conditioner have already cleared surface buildup, so its acids and spicules act on a clean scalp rather than fighting through residue.

PM routine (wash days): 1. Rosemary PDRN Cooling Thickening Shampoo, rinse. 2. Rosemary PDRN Hair & Scalp Conditioner, rinse. 3. Towel-dry until scalp is damp, not dripping. 4. Rosemary PDRN Scalp Serum, part hair, roll along part lines, gently massage in.

If your scalp is barrier-compromised right now (stinging, tight, flaking), pause this serum and use the Shampoo alone for 1-2 weeks first. If you're in AC all day, this formula's cooling agents may feel more intense in a cold room — that's a sensory effect, not a sign of irritation, but reduce use if it becomes uncomfortable.

2 stock-true bundles:

1. Full Rosemary PDRN trio — Shampoo + Conditioner + this Serum. How to use: shampoo → conditioner every wash, serum 2-4x weekly on scalp. Why included: designed as one coherent actives system.

2. Pre-treatment support — Aromatica Rosemary Scalp Scrub 165g + this Serum. How to use: scrub 1x weekly (never same-day as the serum, per the Conflict Solver above), serum on alternating days. Why included: a mechanical pre-treatment gives this serum's already-active formula a cleaner base to work on without doubling up exfoliation the same day.

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

The recommendations above are based on formulation synergy with Rosemary PDRN Scalp 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.

Aromatica Rosemary PDRN Scalp Serum 100ml is a genuinely different formula built on plant-derived PDRN, Redensyl, and vegan micro-spicules rather than salmon-derived PDRN and animal collagen, in a much larger 100ml size — currently verified in stock at Adilsons. Choose the Aromatica if you want a vegan-leaning, larger-volume option; choose this Medicube serum if the Caffeine + dual-acid + physical-spicule combination and rollerball massage format is specifically what you're after.

Choose Rosemary PDRN Scalp Serum over Aromatica Rosemary PDRN Scalp Serum if you need a stronger, more active-forward formula: this Medicube serum combines a marketed ~1% Caffeine with undisclosed-concentration Salicylic Acid AND Glycolic Acid plus animal-sourced Hydrolyzed Sponge spicules, versus Aromatica's gentler, vegan-micro-spicule, PDRN-and-Redensyl-forward positioning.

IF you already tolerate Salicylic Acid elsewhere in your skincare without issue, AND your scalp isn't currently sensitized, THEN this stronger formula is a reasonable choice. IF you're new to leave-on scalp acids, AND/OR you'd prefer a vegan formula, THEN start with the Aromatica alternative instead. IF your barrier is currently compromised, do not upgrade to either active serum yet — repair barrier first with the rinse-off Shampoo alone.

Timing: PM is the more common choice so any tingling settles before daytime activity; both serums are leave-on and occupy the same "scalp treatment" lane — do not use both on the same day.

Don't upgrade to this one if: you're pregnant/nursing without medical sign-off; your scalp is currently irritated; you have a known fungal-acne-prone scalp (see FA-Conditional note above); or you'd prefer a vegan-formulated option.

If you match 2 or more upgrade triggers above, THIS is worth choosing. If not, the Aromatica alternative is sufficient and gentler. Consistency beats complexity.

This product's PRIMARY function is: leave-on scalp exfoliation and refresh via chemical acids, physical spicules, and Caffeine. You do NOT need this if you already own another leave-on scalp acid treatment — finish your current bottle before purchasing.

Check for an open scalp serum/tonic with acid or spicule exfoliation before buying this one; at only 20ml, this is a fast-depleting product, so PAO matters less here than usual, but discard if scent/color changes.

Stacking assessment against the rinse-off Shampoo/Conditioner alone: Significant Benefit (adds a genuinely different leave-on exfoliation mechanism). Against another leave-on scalp acid serum: No Benefit — pick one to avoid over-exfoliating the scalp.

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: check for a scannable QR code on the inner packaging (resolves to medicubeverify.com on genuine units), a clear, legible embossed batch code near the packaging seam, and precise, correctly-spelled Korean and English labeling — note that the labeling-precision check applies to the physical packaging, separate from the live Shopify listing's own title spelling issue noted above.

Medicube positions itself as a "medical beauty" brand pairing at-home devices with companion topical actives. This serum is the most concentrated, active-forward product in the brand's first dedicated hair-care launch. As documented across this brand's broader research, Medicube has a well-established, repeated pattern of naming products after an ingredient present at a genuinely trace concentration — this serum's own 100ppb PDRN figure is the most extreme instance of that pattern confirmed to date, so read "PDRN" as this product's marketing identity, not its functional active.

This is a newly launched product, and independent Reddit or Amazon customer-review text was not locatable during this research pass — a genuine gap, not evidence of poor performance. What was found is professional editorial coverage: a Daily Beast/The Looker reviewer's personal trial reported measurably less shedding from week 4 and first new "baby hairs" noticed at week 7 (an individual, uncontrolled trial, not a clinical result); a Bustle reviewer found the serum lightweight and fast-absorbing with a genuine cooling effect, but noted the rollerball applicator felt "a little awkward to use" at first.

Common praise theme: lightweight, fast-absorbing, genuinely cooling sensory experience. Common (mild) complaint theme: the rollerball applicator has a learning curve. No independent critical review beyond that applicator note was located this round.

Sustainability: check local recycling guidance for the bottle/rollerball materials; refillable status not confirmed by the brand.

Is the rollerball supposed to feel cold? Yes — the formula's Menthol, Menthyl Lactate, and Ethyl Menthane Carboxamide combination is designed for a cooling sensory effect; this is expected, not a reaction.

Can I use this every day? Not recommended — 2-4x weekly is the ceiling given the combined acid and physical-exfoliant load; daily use risks irritation rather than faster results.

Does it actually contain enough PDRN to matter? The brand's own disclosed figure is 100ppb (0.00001%) — genuinely trace. The serum's more plausible functional actives are Caffeine, the physical spicules, and the Salicylic/Glycolic Acid pair.

Is it safe during pregnancy? Not confirmed unsafe under this store's hard-threshold criteria, but given the combined leave-on acid and physical-exfoliant load, we recommend consulting your doctor first — see the Safety Notice above.

Why does the product name say "Roseymary" on this store? That's a genuine spelling error on the live listing (the correct spelling, "Rosemary," is used on its Shampoo and Conditioner siblings) — not a different product or variant.

PDRN

Polydeoxyribonucleotide, a salmon-derived DNA fragment ingredient marketed for regenerative/skin-repair support.

Spicules

Tiny physical (mechanical) exfoliating particles, here derived from marine sponge, that create micro-channels to help other ingredients distribute across the scalp.

Fairy dusting

Including a marketed ingredient at such a low concentration it likely has no real functional effect.

Drying alcohol

A volatile alcohol (like Alcohol Denat.) that can dry out skin/scalp with frequent leave-on use, distinct from moisturizing fatty alcohols.

FA-Conditional

An ingredient that may feed Malassezia yeast (linked to fungal acne/folliculitis) in some people but not others.

EGF

Epidermal Growth Factor — a marketed regenerative ingredient category; this SKU's specific EGF-type ingredient could not be confirmed by exact INCI name.

MFDS

Korea's Ministry of Food and Drug Safety, which classifies cosmetics as General or Functional.

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: established users of leave-on scalp actives who want a cooling, rollerball-applied treatment step with real Caffeine, chemical acids, and physical spicule exfoliation — the strongest, most targeted product in the Rosemary PDRN trio.

Key benefits: disclosed Caffeine concentration; genuine dual chemical-plus-physical exfoliation mechanism; distinctive cooling rollerball ritual well-suited to Mauritius heat.

Keep in mind: the brand's own headline PDRN is disclosed at only 100ppb, "EGF" could not be independently confirmed in the INCI, this is not suitable for pregnant/nursing users without medical sign-off or for anyone under 16, and the live listing's title carries a "Roseymary" spelling typo unrelated to the product's authenticity.