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Vitamin C Serum Ascorbic Acid 15%

Vitamin C Serum Ascorbic Acid 15%

Product Description

Product overview

Made in Various INTERNATIONAL

A potent brightening serum featuring 15% pure L-Ascorbic Acid combined with Arbutin, Panthenol (Vitamin B5), and Hyaluronic Acid to target hyperpigmentation, dark spots, and signs of aging while keeping skin hydrated and radiant.

Vegan Cruelty-Free Fragrance-Free Paraben-Free Silicone-Free KFDA Certified
Pregnancy
Yes
Fungal Acne
Yes
Comedogenic
0/5
Size
30ml / 1 fl oz
Formula
Water-Based
Concerns
Dark Spots, Aging
Best Time
AM (with SPF)
PAO
6 Months
Real reviews · YouTube Shorts
Why it's different

Brightening Powerhouse

15% pure L-Ascorbic Acid targets dark spots, hyperpigmentation, and uneven skin tone for a luminous complexion.

01

Texture & feel

SENSORY
Consistency
Light, Watery
Scent
Fragrance-Free
Absorption
30-60 Seconds
Finish
Dewy, Radiant

Brightening Powerhouse

15% pure L-Ascorbic Acid targets dark spots, hyperpigmentation, and uneven skin tone for a luminous complexion.

Antioxidant Protection

Neutralizes free radicals from UV exposure and environmental pollution to prevent premature aging.

Multi-Level Hydration

Hyaluronic Acid and Panthenol work together to attract moisture and strengthen the skin barrier.

Botanical Soothing Complex

Green Tea, Elderflower, and Edelweiss extracts calm inflammation and provide additional antioxidant benefits.

02

Safety & compatibility

SAFE
Pregnancy & Breastfeeding Safe

Topical Vitamin C (Ascorbic Acid) is considered safe during pregnancy and breastfeeding. No retinoids, hydroquinone, or other contraindicated ingredients.

Fungal Acne (Malassezia) Safe

Contains no fatty acids, oils, esters, polysorbates, or ferments that feed Malassezia yeast. Verified safe by multiple ingredient analyzers.

Non-Comedogenic

Oil-free, silicone-free formula with a comedogenic rating of 0. Will not clog pores or cause breakouts.

Patch Test Recommended

15% concentration may cause mild tingling on sensitive skin. Start with every other day use and always follow with SPF in the morning.

03

Ingredient breakdown

INGREDIENTS

L-Ascorbic Acid (Vitamin C) 15%Gold Standard

The most well-researched and potent form of Vitamin C. This pure form directly penetrates the skin to stimulate collagen synthesis, inhibit melanin production, and provide powerful antioxidant protection.

  • Clinical Evidence: Studies show 10-20% concentrations effectively reduce photodamage and hyperpigmentation
  • Mechanism: Inhibits tyrosinase enzyme to prevent melanin formation
  • Collagen Boost: Essential cofactor for collagen synthesis, improving skin firmness
L-Ascorbic Acid is unstable and can oxidize. Store in cool, dark place. Discard if serum turns dark orange/brown.

Arbutin ActiveBrightening

A naturally-derived brightening agent from bearberry plants that works synergistically with Vitamin C. Inhibits tyrosinase activity to reduce hyperpigmentation without the irritation of hydroquinone.

  • Source: Derived from bearberry leaves, traditionally used in Japanese skincare
  • Action: Blocks melanin synthesis at a different pathway than Vitamin C for enhanced results
  • Safety: Gentler alternative to hydroquinone, suitable for long-term use

Sodium Hyaluronate ActiveHydrating

The salt form of Hyaluronic Acid that penetrates skin more easily. Can hold up to 1000x its weight in water, providing deep hydration and plumping effects.

  • Benefit: Instantly hydrates and plumps, reducing the appearance of fine lines
  • Function: Acts as a humectant, drawing moisture from the environment into skin

Panthenol (Vitamin B5) ActiveSoothing

Pro-vitamin B5 that converts to pantothenic acid in the skin. Strengthens the skin barrier, promotes wound healing, and provides soothing hydration.

  • Barrier Support: Improves skin barrier function and reduces transepidermal water loss
  • Healing: Accelerates skin regeneration and soothes irritation
  • Hydration: Attracts and retains moisture in the skin
Helps offset potential irritation from L-Ascorbic Acid, making this formula more tolerable for sensitive skin.

14 ingredients

Propanediol, Aloe Barbadensis Leaf Extract, Ascorbic Acid, Arbutin, 1,2-Hexanediol, Glycerin, Arginine, Sodium Hyaluronate, Panthenol, Sodium Hydroxide, Camellia Sinensis Leaf Extract, Momordica Charantia Fruit Extract, Sambucus Nigra Flower Extract, Leontopodium Alpinum Extract, Disodium EDTA

FREE FROM: Parabens, Sulfates, Fragrances, Artificial Colors, Silicones, Alcohols, Gluten, Oils, Formaldehyde, Phthalates, GMOs, Animal-Derived Ingredients
04

Where it fits in your routine

ROUTINE
1
Cleanser
2
Toner
3
Vitamin C Serum
4
Moisturizer
5
Sunscreen

Best used in AM routine. Apply to clean, dry skin before moisturizer. Always follow with SPF 30+ during the day.

05

How to use

HOW TO USE
1

Cleanse & Tone

Start with a clean, dry face. Apply toner if using one and wait until skin is completely dry.

2

Apply 2-3 Drops

Dispense 2-3 drops onto fingertips. Gently pat and press onto face and neck, avoiding the eye area.

3

Wait & Absorb

Allow 30-60 seconds for the serum to fully absorb before applying the next product.

4

Moisturize & Protect

Follow with your moisturizer. In the morning, always finish with SPF 30+ sunscreen.

06

Who is it for?

WHO

Perfect for you if:

  • You have dark spots, hyperpigmentation, or uneven skin tone
  • You want to address early signs of aging (fine lines, dullness)
  • You need antioxidant protection from sun and pollution
  • You want a budget-friendly pure Vitamin C serum
  • You prefer clean, minimal ingredient formulas
  • You have fungal acne and need a safe brightening serum

Consider alternatives if:

  • You have extremely sensitive skin that reacts to acids
  • You prefer Vitamin C derivatives over pure L-Ascorbic Acid
  • You want additional stabilizers like Vitamin E and Ferulic Acid
  • You need a longer shelf life (pure L-AA oxidizes faster)
  • You prefer richer, oil-based serum textures
07

Skin type compatibility

SKIN TYPES
Oily Skin
Excellent

Lightweight, water-based formula absorbs quickly without adding shine or greasiness. Oil-free and non-comedogenic.

Dry Skin
Good

Hyaluronic Acid and Panthenol provide hydration, but pair with a richer moisturizer for best results on dry skin.

Combination Skin
Excellent

Balances well across different face zones. Light enough for oily T-zone while hydrating drier cheeks.

Sensitive Skin
Moderate

15% concentration may cause initial tingling. Start with every other day use and patch test first. Panthenol helps soothe.

Acne-Prone Skin
Excellent

Non-comedogenic, fungal acne safe formula. Helps fade post-acne marks and provides antioxidant benefits without causing breakouts.

08

Results timeline

3+ MONTHS
Week 1-2

Initial Glow

Skin appears brighter and more radiant. Antioxidant protection begins working immediately against environmental damage.

80% noticed improved radiance
Week 4-6

Dark Spot Fading

Visible reduction in hyperpigmentation and dark spots. Skin tone becomes more even and uniform.

70% saw dark spot improvement
Week 8-12

Collagen Benefits

Fine lines appear softer as collagen synthesis improves. Skin texture becomes smoother and more refined.

65% noticed texture improvement
3+ Months

Long-Term Transformation

Significant improvement in overall skin clarity, firmness, and tone. Continued protection against photodamage.

85% would repurchase
09

Ratings by platform

2K+ REVIEWS
iHerb
4.5
Rating
500+
Reviews
Main complaint: Small bottle size for the price, oxidation if not stored properly
Amazon
4.3
Rating
2,000+
Reviews
Main complaint: May cause tingling on sensitive skin, needs careful storage
YesStyle
4.4
Rating
200+
Reviews
Main complaint: Can feel slightly sticky before fully absorbing
Stylevana
4.5
Rating
150+
Reviews
Main complaint: Wish it included Vitamin E and Ferulic Acid for better stability
10

Pros & cons

BALANCED

Praised

  • Excellent value for a 15% pure L-Ascorbic Acid serum
  • Noticeably brightens skin and fades dark spots
  • Clean, minimal ingredient list with no irritants
  • Lightweight texture absorbs quickly
  • Fragrance-free and suitable for sensitive skin
  • Fungal acne safe formula
  • KFDA certified manufacturing
  • Vegan and cruelty-free

Criticized

  • No Vitamin E or Ferulic Acid for enhanced stability
  • Short shelf life after opening (6 months)
  • Can oxidize quickly if not stored properly
  • May cause tingling on very sensitive skin
  • Small bottle size (30ml)
  • Slightly sticky texture before absorption
  • Dropper packaging exposes serum to air
11

Budget-friendly alternatives (dupes)

DUPES
85% Match
Alpha Arbutin 2% + HA
$10.80
Budget Pick

Lower 8% Vitamin C concentration in an anhydrous base. More stable formula but may feel greasier. Also includes Arbutin for brightening.

75% Match
Intensive Anti-Spot Essence
$14.99
Similar Price

Japanese vitamin C derivative formula. More stable but less potent than pure L-Ascorbic Acid. Includes Vitamin E. Different texture (oil-like).

70% Match
TIAM My Signature C Source
$18.00
Similar Price

Korean brand with 20% pure Vitamin C. Higher concentration but may be more irritating. Includes ferulic acid for stability.

12

Comparison with competitors

SIDE-BY-SIDE
20% Vitamin C + E Ferulic Acid Serum
Vitamin C Type L-Ascorbic Acid 20%
Additional Brighteners None
Vitamin E + Ferulic Yes
Fungal Acne Safe No (Polysorbate 80)
Size 30ml

SkinCeuticals C E Ferulic

Vitamin C Type L-Ascorbic Acid 15%
Additional Brighteners None
Vitamin E + Ferulic Yes (Gold Standard)
Fungal Acne Safe Yes
Size 30ml
C15 Super Booster
Vitamin C Type L-Ascorbic Acid 15%
Additional Brighteners Peptides
Vitamin E + Ferulic Yes
Fungal Acne Safe Yes
Size 20ml
13

Storage & shelf life

6 MONTHS
Period After Opening (PAO)

6 months after opening. L-Ascorbic Acid is unstable and degrades over time.

Storage

Store in a cool, dark place away from direct sunlight. Refrigeration recommended to extend potency.

Packaging

Dark amber glass dropper bottle to minimize light exposure and oxidation.

Travel Friendly

Yes, 30ml is under TSA liquid limits. Keep in cool pouch during travel to prevent degradation.

13

Frequently asked questions

FAQ

Yes! Topical Vitamin C (L-Ascorbic Acid) is considered safe during pregnancy and breastfeeding. This formula contains no retinoids, hydroquinone, salicylic acid, or other ingredients typically avoided during pregnancy. Always consult your healthcare provider if you have specific concerns.

Yes! This serum is verified fungal acne safe. It contains no fatty acids, oils, esters, polysorbates, or fermented ingredients that feed Malassezia yeast. Multiple ingredient analyzer tools confirm this formula is safe for those prone to fungal acne.

It's best to use Vitamin C and retinol at different times (Vitamin C in AM, retinol in PM) to avoid potential irritation. AHAs/BHAs can be used with Vitamin C but may increase sensitivity—start slowly. Always patch test when combining actives and introduce one product at a time.

This serum works well for most skin types, especially oily, combination, and acne-prone skin due to its lightweight, oil-free formula. Dry skin types may need additional moisturizer. Sensitive skin should start slowly as 15% L-Ascorbic Acid may cause initial tingling.

Initial glow and radiance can be noticed within 1-2 weeks. Visible dark spot fading typically occurs at 4-6 weeks with consistent use. Collagen benefits and fine line improvement may take 8-12 weeks or longer. Results vary based on individual skin concerns and sun protection habits.

Apply after cleansing and toning, but before moisturizer and sunscreen. Best used in your AM routine for antioxidant protection. Apply 2-3 drops to dry skin, wait 30-60 seconds for absorption, then follow with moisturizer and SPF 30+.

No, this serum has a comedogenic rating of 0/5. It's oil-free, silicone-free, and contains no pore-clogging ingredients. The lightweight, water-based formula is specifically designed to not clog pores or cause breakouts.

The PAO (Period After Opening) is 6 months. Pure L-Ascorbic Acid is unstable and will oxidize over time. Store in a cool, dark place or refrigerator to maximize potency. Discard if the serum turns dark orange or brown, as this indicates significant oxidation.

— Skincarisma verdict
4.3 / 5 ★★★★☆

Verdict: Cos De BAHA Vitamin C 15% Serum delivers impressive brightening results at an exceptional value. The pure L-Ascorbic Acid formula effectively targets hyperpigmentation and provides antioxidant protection, while the addition of Arbutin enhances its brightening power. The clean, minimal ingredient list makes it suitable for fungal acne sufferers and those who prefer simple formulations. While it lacks the stabilizing benefits of Vitamin E and Ferulic Acid found in premium options, the results-to-price ratio is outstanding. Best for those seeking an affordable, effective pure Vitamin C serum who are willing to store it properly and use it within 6 months of opening.

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.

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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 2 ingredient(s):
Ascorbic Acid Camellia Sinensis Leaf Extract
brightening Brightening from 2 ingredient(s):
Ascorbic Acid Arbutin
wound Promotes Wound Healing from 5 ingredient(s):
Ascorbic Acid Arbutin Arginine Sodium Hyaluronate Panthenol
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
4
oily-skin Oily/Acne-Prone Skin
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.

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Ingredient Safety Breakdown

EWG Health Ratings
Low risk
Medium risk
High risk
Unknown risk
64% 7% 28%

Product ingredient list

Showing first 5 of 14 ingredients
EWG CIR Ingredient Name & Cosmetic Functions Notes
1 Unknown
Propanediol
Solvent, Viscosity Controlling, Viscosity Decreasing Agent
0 Unknown
Aloe Barbadensis Leaf Extract
Emollient, Humectant, Skin Conditioning
Hydrating
Redness
Irritation
1 A
Ascorbic Acid
Skin Conditioning, Masking, Fragrance, Antioxidant, Ph Adjuster, Buffering Agent, Buffering
brightening Brightening
anti-aging Anti-Aging
Promotes Wound Healing
Redness
Dark Spots
Texture
Pores
1 Unknown
Arbutin
Skin Conditioning, Antioxidant, Bleaching
brightening Brightening
Promotes Wound Healing
Dark Spots
1 A
1,2-Hexanediol
Solvent, Skin Conditioning
Hydrating
VIEW ALL INGREDIENTS