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Description
MUJI Fermented Booster Serum — Japanese Fermented Skincare Serum 50ml
MUJI's minimalist answer to the fermented skincare trend. This fragrance-free, alcohol-free booster serum is built on a Saccharomyces fermentation of rice bran — delivering amino acids, Ceramide NP, and Hydrolyzed Hyaluronic Acid in a featherlight pre-toner step. Viral on TikTok J-beauty communities for its "glass skin" priming effect. No parabens, no phenoxyethanol, mildly acidic, allergy tested. The definition of clean, effective minimalism — exactly what MUJI does best. Ships from Kobe, Japan.
Key Benefits
- Fermented rice bran activates skin's natural renewal — Saccharomyces Ferment Filtrate (rice bran) is rich in Beta-glucan, amino acids, and organic acids that stimulate cellular turnover and improve skin texture over time.
- 5 skin-essential amino acids — Alanine, Arginine, Sodium Glutamate, Serine, and Proline directly replenish the skin's Natural Moisturizing Factor (NMF), restoring moisture retention from within.
- Ceramide NP barrier reinforcement — boosts the intercellular lipid matrix to reduce TEWL (transepidermal water loss) and protect against environmental irritants.
- Hydrolyzed Hyaluronic Acid for deep hydration — low-molecular HA penetrates below the surface layer, holding moisture where it's needed most rather than just sitting on top.
- Ultra-clean, allergy-tested formula — free from fragrance, alcohol, parabens, and phenoxyethanol. Mildly acidic (matches skin's natural pH). Perfect for reactive, sensitive skin types.
Product Details
| Brand | MUJI (無印良品) |
|---|---|
| Product Name (JP) | 発酵ブースターセラム |
| Size | 50ml pump bottle |
| Step | Pre-toner booster (first step after cleansing) |
| Formula | Fragrance-free / Alcohol-free / Paraben-free / Phenoxyethanol-free |
| Tested | Allergy tested, mildly acidic |
| Best For | All skin types; ideal for sensitive, dry, and dull skin |
| Country of Origin | Japan |
Who Is This For?
Anyone who wants to take their existing skincare routine to the next level without adding complex actives or fragrance. MUJI's booster serum is perfect as a first step after cleansing to "prime" the skin before toner and moisturizer — boosting absorption of everything that follows. It's particularly popular with those following a J-beauty minimalist routine, sensitive skin types who react to preservatives, and anyone chasing a hydrated, glass-skin glow without fuss or fragrance.
How To Use
- Use as the very first step after cleansing, on dry or slightly damp skin.
- Dispense 1–2 pumps onto your palm.
- Press gently into skin across the entire face, focusing on dry areas.
- Immediately follow with your regular toner, essence, or moisturizer — the fermented complex primes skin for better absorption of subsequent steps.
- Use morning and evening as part of your daily routine.
Full Ingredients
Water, Glycerin, Butylene Glycol, Saccharomyces Ferment Filtrate (Rice Bran Fermentation Liquid), Ceramide NP, Alanine, Arginine, Sodium Glutamate, Serine, Proline, Hydrolyzed Hyaluronic Acid, Yeast Extract, Sodium Acetylated Hyaluronate, Citric Acid, Xanthan Gum.
Note: INCI verified from MUJI product page and retailer sources. Confirm full list with supplier documentation before publishing.
Cautions & Warnings
- For external use on face only. Avoid eye area.
- Contains Yeast Extract — those with yeast sensitivities should patch test before full use.
- Although allergy tested, individual reactions are possible. Discontinue if irritation occurs.
- Keep out of reach of children. Store at room temperature away from sunlight.
Package Contents
- 1 × MUJI Fermented Booster Serum, 50ml pump bottle
Shipping & Store Notes
- Ships directly from Japan.
- Processing time: 2–6 business days.
- Tracking number provided after dispatch.
- Import duties and taxes may apply depending on destination country.
- Opened cosmetics and supplements cannot be returned for hygiene and safety reasons.
Authenticity Guarantee
100% authentic MUJI product sourced from official Japanese retail channels. Shipped from Kobe, Japan.
FAQ
What does "booster serum" mean — how is this different from a regular serum?
A booster serum is applied before your toner (not after), on bare cleansed skin. Its job is to soften the skin barrier and prime it for better absorption of everything that follows. Think of it as unlocking your skin before applying actives.
Is fermented skincare better than non-fermented?
Fermentation breaks down large molecules into smaller, more bioavailable components. The rice bran ferment in this serum provides amino acids and organic acids that are more readily absorbed by skin than unfermented equivalents. Japanese skincare has used fermentation for decades — this is a science-backed tradition, not a trend gimmick.
It's fragrance-free — does it have no smell at all?
It has a very subtle, neutral natural scent from the fermented rice bran base — no added fragrance. Most users describe it as nearly odorless.
Can I use this with retinol or acid exfoliants?
Yes. The mildly acidic formula and clean ingredient list make it compatible with most actives. Apply the booster first, then wait 30–60 seconds before applying retinol or acids.
