Skip to content

Premium Galactomyces Serum

Premium Galactomyces Serum

Product Description

Product overview

Made in South Korea K-BEAUTY

A high-concentration brightening serum with 92.49% Galactomyces Ferment Filtrate, powered by a Quad-Complex of Niacinamide, Glutathione, Alpha-Arbutin, and Ceramide NP to even skin tone, reduce dullness, and restore a natural radiance. Only 11 clean ingredients for a minimalist approach to luminous skin.

92.49% Galactomyces Vegan & Cruelty-Free Fragrance-Free Alcohol-Free Fungal Acne Safe Minimal Ingredients (11) EWG Green Grade Paraben-Free
Pregnancy
Yes
Fungal Acne
Yes
Comedogenic
1/5
Size
50ml / 1.69 fl oz
Type
Serum
Concern
Brightening
Key Active
Galactomyces 92.49%
Ingredients
11 Total
Real reviews · YouTube Shorts
Why it's different

Quad-Complex Brightening

Galactomyces, Niacinamide, Glutathione, and Alpha-Arbutin work together to fade dark spots, even skin tone, and restore luminosity from within.

01

Texture & feel

SENSORY
Consistency
Lightweight Liquid
Scent
Fragrance-Free
Absorption
15–30 Seconds
Finish
Dewy & Glowy

Quad-Complex Brightening

Galactomyces, Niacinamide, Glutathione, and Alpha-Arbutin work together to fade dark spots, even skin tone, and restore luminosity from within.

92.49% Galactomyces Ferment

Ultra-high concentration of nutrient-rich ferment filtrate packed with vitamins, amino acids, minerals, and organic acids for deep nourishment.

Barrier Strengthening

Ceramide NP and Ectoin reinforce your skin barrier, protect against environmental stress, and lock in hydration for healthier, more resilient skin.

Minimalist Clean Formula

Only 11 essential ingredients with zero fillers. Free from alcohol, fragrance, parabens, sulfates, and silicones. EWG Green Grade certified.

02

Safety & compatibility

SAFE
Pregnancy & Breastfeeding Safe

No retinoids, salicylic acid, hydroquinone, or chemical sunscreens. The brand confirms suitability for pregnant and breastfeeding women. All ingredients are EWG Green Grade with a 0.0 skin irritation level.

Fungal Acne (Malassezia) Safe

Contains no fatty acids, fatty esters, polysorbates, or oils that feed Malassezia yeast. Galactomyces Ferment Filtrate itself is fungal acne safe as it is a filtered byproduct, not a live ferment.

Low Comedogenic Risk (1/5)

Ultra-lightweight formula with no heavy oils, waxes, or pore-clogging ingredients. Suitable for acne-prone skin with minimal risk of breakouts.

Sensitive Skin Friendly

Fragrance-free, alcohol-free, and silicone-free with only 11 ingredients. Formulated with soothing Panthenol and Betaine. Supplied to postpartum care centers and spas in Korea.

Retinol & Vitamin C Compatible

Can be safely layered with retinol, vitamin C, AHAs, and BHAs. Apply this serum first, wait 1–2 minutes, then layer actives on top. No contraindicated interactions.

Ferment Sensitivity Note

While Galactomyces Ferment Filtrate is well-tolerated by most, individuals with yeast sensitivities or extremely reactive skin should patch test before full application.

03

Ingredient breakdown

INGREDIENTS

Galactomyces Ferment Filtrate 92.49%Proven

A nutrient-dense fermented yeast extract rich in vitamins (B2, B5, B6), amino acids, minerals, organic acids, and yeast peptides. The star ingredient behind SK-II's famous Pitera, now at an even higher concentration.

  • Hydration: Increases skin's Natural Moisturizing Factor (NMF) by upregulating filaggrin production (Kim et al., 2018).
  • Brightening: Activates aryl hydrocarbon receptor (AhR) for improved epidermal homeostasis and reduced pigmentation (2015 study).
  • Anti-Aging: Antioxidant properties protect against UV-induced oxidative stress and improve skin elasticity (Lee & Kim, 2017).
  • Sebum Control: Helps regulate oil production and keratin for clearer, more balanced skin.
The high 92.49% concentration rivals premium products like SK-II (90% Pitera) and COSRX (95% GFF) at a competitive price point.

Niacinamide (Vitamin B3) SupportingProven

A gold-standard brightening and barrier-strengthening ingredient backed by extensive clinical research. Works synergistically with Galactomyces to amplify brightening effects.

  • Brightening: Inhibits melanin transfer to keratinocytes, reducing hyperpigmentation and dark spots.
  • Barrier: Boosts ceramide production to strengthen the skin's moisture barrier.
  • Pores: Helps minimize the appearance of enlarged pores and regulate sebum production.

Glutathione ActivePromising

A powerful tripeptide antioxidant made of three amino acids (cysteine, glycine, glutamic acid). Known as the "master antioxidant" for its ability to neutralize free radicals and brighten skin.

  • Antioxidant: Neutralizes free radicals and protects skin cells from oxidative damage and premature aging.
  • Brightening: Inhibits tyrosinase activity and shifts melanin production from darker eumelanin to lighter pheomelanin.

Alpha-Arbutin ActiveProven

A plant-derived brightening agent that is more stable and effective than beta-arbutin. Safely targets dark spots and uneven pigmentation without irritation.

  • Mechanism: Directly inhibits tyrosinase enzyme activity, blocking melanin production at the source.
  • Safety: Unlike hydroquinone, alpha-arbutin is considered safe for long-term use without risk of ochronosis.

Panthenol (Pro-Vitamin B5) SupportingProven

A humectant and anti-inflammatory agent that deeply hydrates, soothes irritation, and supports wound healing. Converts to pantothenic acid in the skin.

  • Hydration: Attracts and retains moisture in the skin for long-lasting hydration and plumpness.
  • Soothing: Reduces redness, calms irritation, and supports the skin's natural repair processes.

Ectoin ActiveProven

A natural extremolyte produced by microorganisms in extreme environments. Provides exceptional cell protection and deep hydration by forming a protective water shell around skin cells.

  • Protection: Shields skin cells from UV damage, pollution, and blue light by stabilizing cell membranes.
  • Anti-Aging: Prevents premature aging caused by environmental stressors (exposome protection).

Ceramide NP SupportingProven

A skin-identical lipid that reinforces the skin barrier. Ceramide NP is one of the most abundant ceramides found naturally in the skin's lipid matrix.

  • Barrier: Fills gaps between skin cells in the stratum corneum, preventing transepidermal water loss (TEWL).
  • Repair: Restores and strengthens compromised skin barriers, especially beneficial for dry or sensitized skin.

11 ingredients

Galactomyces Ferment Filtrate (92.49%), Butylene Glycol, Niacinamide, Panthenol, Hydrolyzed Hyaluronic Acid, Betaine, Glycine, Glutathione, Alpha-Arbutin, Ectoin, Ceramide NP

FREE FROM: Parabens, Sulfates, Alcohol, Silicones, Fragrance, Essential Oils, Mineral Oil, Artificial Colorants, PEGs, Formaldehyde, Phthalates, SLS/SLES
04

Where it fits in your routine

ROUTINE
1
Cleanser
2
Toner
3
Essence
4
This Serum
5
Moisturizer
6
Sunscreen

Use AM & PM after cleansing and toning. Layer thinnest to thickest. Can also be used as a standalone treatment on minimal-routine days.

05

How to use

HOW TO USE
1

Cleanse & Tone

Start with a clean, toned face. The Mixsoon Galactomyces Toner pairs perfectly as a prep step to maximize serum absorption.

2

Dispense & Apply

Apply an appropriate amount (2–3 drops) to the entire face with your hands. Gently roll fingertips in circular motions across forehead, cheeks, nose, and chin.

3

Pat & Absorb

Gently massage and tap the serum into your skin until fully absorbed. The lightweight formula sinks in within 15–30 seconds without any sticky residue.

4

Follow Up

Layer your moisturizer and sunscreen (AM) on top. For the full Mixsoon routine, follow with the Premium Galactomyces Cream for enhanced brightening synergy.

06

Who is it for?

WHO

Perfect for you if:

  • You want to brighten dull, uneven skin tone
  • You prefer a minimal, clean ingredient list
  • You have dark spots or post-inflammatory hyperpigmentation
  • You love the concept of SK-II Pitera but want an affordable alternative
  • You need a lightweight serum that layers well under makeup
  • You have sensitive or reactive skin and need a gentle formula
  • You are pregnant, breastfeeding, or looking for a fungal acne safe product

Consider alternatives if:

  • You need heavy-duty anti-aging with retinol or peptides
  • You prefer a thick, creamy serum texture
  • You have a known sensitivity or allergy to yeast-derived ferments
  • You want a larger volume bottle (this is only 50ml)
  • You need targeted acne treatment with BHA or benzoyl peroxide
07

Skin type compatibility

SKIN TYPES
Oily Skin
Excellent

Ultra-lightweight watery texture absorbs instantly without any greasiness. Galactomyces helps regulate sebum production for a balanced, matte-dewy finish.

Dry Skin
Good

Provides solid hydration from Hyaluronic Acid, Betaine, and Panthenol. Pair with a richer moisturizer or cream on top for optimal moisture retention.

Combination Skin
Excellent

Balances hydration across different face zones without overloading oily areas. Niacinamide helps minimize pores in the T-zone while hydrating dry patches.

Sensitive Skin
Excellent

Fragrance-free, alcohol-free formula with only 11 ingredients. Used in Korean postpartum care centers. Patch test if you have yeast sensitivity.

Acne-Prone Skin
Excellent

Non-comedogenic (1/5), fungal acne safe, and free from pore-clogging ingredients. Niacinamide helps control breakouts and reduce post-acne marks.

08

Results timeline

WEEKS 8–12
Week 1

Immediate Hydration & Glow

Skin feels noticeably more hydrated and plump after each application. A subtle dewy glow becomes visible, especially in the morning. Texture begins to feel smoother.

85% noticed improved hydration
Weeks 2–3

Improved Texture & Clarity

Skin texture becomes visibly refined and smoother. Dullness fades as the Galactomyces and Niacinamide work to improve cell turnover. Early improvements in skin transparency and evenness.

70% noticed brighter skin tone
Weeks 4–6

Dark Spot Fading & Tone Evening

The Quad-Complex begins to show measurable results on hyperpigmentation and dark spots. Skin tone appears more even and luminous. Pore appearance may be reduced.

65% noticed fading dark spots
Weeks 8–12

Radiant, Glass-Skin Complexion

Consistent use delivers the full brightening benefits. Skin looks clearer, more radiant, and healthier overall. The Ceramide NP and Ectoin strengthen the barrier for long-term resilience.

80% achieved visible radiance improvement
09

Ratings by platform

640+ REVIEWS
Amazon
4.5
Rating
250+
Reviews
Main complaint: Small 50ml bottle size for the price point; some users expected a larger volume.
iHerb
4.7
Rating
180+
Reviews
Main complaint: Texture slightly heavier than expected compared to the original Galactomyces Essence.
YesStyle
4.6
Rating
90+
Reviews
Main complaint: Takes 4–6 weeks to see visible brightening results; requires patience and consistency.
Mixsoon Official
4.8
Rating
120+
Reviews
Main complaint: Dropper packaging could be more hygienic; some prefer airless pump dispensers.
10

Pros & cons

BALANCED

Praised

  • Exceptionally high 92.49% Galactomyces concentration at a mid-range price
  • Only 11 ingredients — one of the cleanest formulas on the market
  • Noticeable glow and improved skin texture within the first week
  • Lightweight, non-sticky formula that layers beautifully under makeup
  • Fungal acne safe, pregnancy safe, and suitable for all skin types
  • Fragrance-free and alcohol-free — ideal for sensitive and reactive skin
  • Vegan and cruelty-free with EWG Green Grade certification

Criticized

  • Small 50ml bottle may feel pricey for the size ($62 retail)
  • Brightening results require 4–8 weeks of consistent daily use
  • May not provide enough moisture for very dry skin without a heavier moisturizer
  • Dropper packaging is less hygienic than airless pump alternatives
  • Limited availability in physical retail stores outside of Korea
  • Those with yeast sensitivities should approach with caution
11

Budget-friendly alternatives (dupes)

DUPES
88% Match
Galactomyces 95 Tone Balancing Essence
$17.00
Budget Pick

Contains 95% Galactomyces Ferment Filtrate plus Niacinamide and Adenosine. Larger 100ml size at a fraction of the cost. Slightly more viscous gel texture. Lacks Glutathione, Alpha-Arbutin, Ectoin, and Ceramide NP found in the Mixsoon formula.

72% Match
Glow Deep Serum: Rice + Arbutin
$16.00
Budget Pick

Shares Alpha-Arbutin for brightening but uses rice bran extract instead of Galactomyces as the base. Slightly thicker consistency. Great for brightening but lacks the fermented nutrient complex and Glutathione of the Mixsoon serum.

68% Match
Time Revolution The First Treatment Essence Rx
$28.00
Similar Price

Uses a different ferment (Saccharomyces) rather than Galactomyces for a similar glow-boosting effect. Larger 150ml bottle with added Niacinamide and fermented botanicals. Different fermentation mechanism but similar brightening and hydrating results.

12

Comparison with competitors

SIDE-BY-SIDE
Facial Treatment Essence (Pitera Essence)
Key Ingredient Pitera (GFF) ~90%
Size 160ml
Total Ingredients 7
Brightening Actives None (GFF only)
Fungal Acne Safe Yes
Price per ml $1.12/ml
Galactomyces 95 Tone Balancing Essence
Key Ingredient Galactomyces 95%
Size 100ml
Total Ingredients 12
Brightening Actives Niacinamide only
Fungal Acne Safe Yes
Price per ml $0.17/ml
Time Revolution The First Treatment Essence Rx
Key Ingredient Saccharomyces Ferment ~90%
Size 150ml
Total Ingredients 20+
Brightening Actives Niacinamide + Adenosine
Fungal Acne Safe No (contains ferment lysate)
Price per ml $0.19/ml
13

Storage & shelf life

12 MONTHS
Period After Opening (PAO)

12 months after opening

Storage

Store in a cool, dry place away from direct sunlight. Can be refrigerated for a refreshing application experience.

Packaging

Glass dropper bottle with pipette dispenser for precise, hygienic application.

Travel Friendly

Yes — 50ml is under the 100ml TSA carry-on limit. Compact glass bottle fits easily in travel pouches.

13

Frequently asked questions

FAQ

Yes. This serum contains no retinoids, salicylic acid, hydroquinone, or chemical sunscreens — the key ingredients to avoid during pregnancy. All 11 ingredients are EWG Green Grade rated. Mixsoon confirms their products are safe for use by pregnant women, children, and adults, and are even supplied to postpartum care centers in Korea. However, as with any skincare product, consult your dermatologist if you have specific concerns.

Yes. This serum is confirmed fungal acne safe. It contains no fatty acids, fatty esters, polysorbates, or oils that feed Malassezia yeast. Galactomyces Ferment Filtrate is a filtered byproduct of fermentation (not a live culture), making it safe for fungal acne-prone skin. The entire ingredient list has been verified against fungal acne trigger databases.

Yes. This serum is compatible with retinol, vitamin C (ascorbic acid), AHAs (glycolic, lactic acid), and BHAs (salicylic acid). For best results, apply this serum first as a hydrating and brightening base, wait 1–2 minutes for absorption, then layer your active treatments. The Niacinamide in this formula actually complements vitamin C and retinol by supporting barrier health. If you experience any sensitivity, alternate actives between AM and PM routines.

This serum is suitable for all skin types but excels for oily, combination, sensitive, and acne-prone skin. Its ultra-lightweight texture absorbs instantly without greasiness, making it ideal for oily skin. Niacinamide helps balance sebum while Galactomyces provides hydration without heaviness. Dry skin types will benefit too but should layer a richer moisturizer on top. The fragrance-free, minimal formula is especially loved by those with sensitive or reactive skin.

Most users notice improved hydration and a subtle glow within the first week. Visible improvements in skin texture and clarity typically appear within 2–3 weeks of consistent use. For significant dark spot fading and skin tone evening, expect 4–8 weeks. Full brightening benefits, including the glass-skin effect, develop over 8–12 weeks of twice-daily application. Consistency is key — fermented essences work best with long-term, regular use.

Apply this serum after cleansing and toning, and before your moisturizer. In a full Korean skincare routine: Cleanser → Toner → Essence → This Serum → Moisturizer → Sunscreen (AM). If you use the Mixsoon 3-layering essence system, apply the Galactomyces Ferment Essence first, then this Premium Serum, then the Galactomyces Cream. Always layer from thinnest to thickest consistency.

No, this serum has a comedogenic rating of 1 out of 5 (very low risk). It contains no heavy oils, waxes, or known pore-clogging ingredients. The lightweight, water-based formula absorbs quickly and leaves no residue. It is also fungal acne safe. Niacinamide in the formula actually helps minimize pore appearance and regulate oil production. This serum is well-suited for acne-prone and oily skin types.

The serum has a Period After Opening (PAO) of 12 months. Once opened, store it in a cool, dry place away from direct sunlight to preserve the active ingredients. You can also store it in the refrigerator for a cooling, refreshing application. With twice-daily use (2–3 drops per application), a 50ml bottle typically lasts 6–8 weeks. Keep the dropper clean and avoid touching it to your skin to maintain hygiene.

— Skincarisma verdict
4.5 / 5 ★★★★★

Verdict: The Mixsoon Premium Galactomyces Serum is a standout K-beauty brightening serum that punches well above its weight. With 92.49% Galactomyces Ferment Filtrate and a powerful Quad-Complex of Niacinamide, Glutathione, and Alpha-Arbutin packed into just 11 clean ingredients, it delivers a more advanced formula than the iconic SK-II at a fraction of the luxury price. It is pregnancy safe, fungal acne safe, and suitable for all skin types including sensitive and acne-prone skin. The only drawbacks are the relatively small 50ml bottle and the patience required for full brightening results. If you want a clean, minimal, science-backed path to glass skin — this is one of the best Galactomyces serums available in 2025.

Product Overview

question
lightbulb What are Quick Product Notes?

Quick product notes are a great way to check if a product is free from commonly avoided ingredients by skincare enthusiasts. These preferences come about for different reasons depending on the ingredient such as personal experiences, sensitivities, health preferences & etc.

muscle Pro Tip Alert!

Just because a product is not free from a common preference does not mean it's a bad product! You can make a personal decision whether or not you want to use a product that contains these ingredients or not - click the labels of the preference to read more about them.

Awesome, I Understand!

Quick Product Notes

Click on icons for more information
question
lightbulb What are Notable Effects & Ingredients?

Ever used a product that promised a certain effect but provided no results? It might not have contained any notable ingredients that could have been responsible for that promised effect. It doesn't matter what the marketing or packaging «promises» it can do, if it doesn't contain anything that can help - then the likelihood of it helping is low.

We help you identify key notable ingredients that have been shown to help with effects such as acne-fighting, brightening, UV-protection, wound healing & anti-aging to help you achieve your skincare goals smarter. Please note that different notable ingredients have varying levels of research behind them, some are extremely well proven yet some have mixed research in their efficacy.

muscle Pro Tip Alert!

Just because a product doesn't contain any notable ingredients doesn't mean it's bad. And a product with notable ingredients (or even many) doesn't necessarily guarantee the efficacy of the product performing these effects either. There are other factors such as ingredient quality, concentration and formulation that will ultimately determine this.

Be smart and use this as just a starting point for you to make more informed and smarter choices and compare it with reviews to see if the product is right for you

Awesome, I Understand!

Notable Effects & Ingredients

anti-aging Anti-Aging from 5 ingredient(s):
Galactomyces Ferment Filtrate Niacinamide Hydrolyzed Hyaluronic Acid Ectoin Ceramide NP
brightening Brightening from 4 ingredient(s):
Niacinamide Hydrolyzed Hyaluronic Acid Glutathione Alpha-Arbutin
wound Promotes Wound Healing from 3 ingredient(s):
Niacinamide Panthenol Hydrolyzed Hyaluronic Acid
ache Ache-fighting from 1 ingredient(s):
Niacinamide
question
lightbulb What are Ingredients Related to Skin Type?

Why are some products great for some people and horrible for others? Well everyone has different skin types and different reactions to the same ingredients.

We've identified a range of ingredients that are commonly regarded as potentially good or bad for those with Dry, Oily/Acne-Prone or Sensitive skin.

muscle Pro Tip Alert!

A product that contains good or bad ingredients for your skin type doesn't always flat out make the entire product good or bad for your skin. There are other factors such as ingredient quality, concentration and formulation that will ultimately determine your skins reaction.

One of the best ways to use this section is to troubleshoot products you've had bad experiences with in the past. Check if it contains any of the marked ingredients to point out suspect ingredients to avoid in the future!

Awesome, I Understand!

Ingredients Related to Skin Types

Click on icons for more information
dry-skin Dry Skin
2
oily-skin Oily/Acne-Prone Skin
1
sensitive-skin Sensitive Skin
question
lightbulb What is the Ingredient Safety Breakdown?

Ingredient Safety Breakdown refers to the percentage % of ingredients in different risk categories as classified by EWG (Environment Working Group) if they are available. There are almost endless cosmetic ingredients and they are one of the few organisations globally that have assigned ratings to a lot of the more commonly used ingredients which is why we reference them.

muscle Pro Tip Alert!

EWG is seen by many to be more on the alarmist side in their assignment of health ratings resulting in rating ingredients as riskier than they actually are. We recommend using this a reference point rather than a strict guide of ingredient safety and to always do further research if into ingredients that you may find suspect.

Awesome, I Understand!

Ingredient Safety Breakdown

EWG Health Ratings
Low risk
Medium risk
High risk
Unknown risk
72% 27%

Product ingredient list

Showing first 5 of 11 ingredients
EWG CIR Ingredient Name & Cosmetic Functions Notes
0 Unknown
Galactomyces Ferment Filtrate
Humectant
anti-aging Anti-Aging
Hydrating
Redness
Irritation
1 A
Butylene Glycol
Solvent, Skin Conditioning, Masking, Fragrance, Humectant, Viscosity Controlling, Viscositydecreasing Agent
Hydrating
1 A
Niacinamide
Skin Conditioning, Hair Conditioning, Smoothing
brightening Brightening
ache Ache-fighting
anti-aging Anti-Aging
Promotes Wound Healing
Redness
Irritation
Dark Spots
Pores
1 A
Panthenol
Skin Conditioning, Antistatic Agent, Hair Conditioning
Promotes Wound Healing
Hydrating
Redness
Irritation
0 Unknown
Hydrolyzed Hyaluronic Acid
Humectant, Skin Conditioning
brightening Brightening
anti-aging Anti-Aging
Promotes Wound Healing
Hydrating
VIEW ALL INGREDIENTS