Overview
What it is
Serum with 2 ingredients that contains Vitamin C
Cool Features
It is vegan, cruelty-free, fungal acne (malassezia) safe, and reef safe
Suited For
It has ingredients that are good for dry skin, brightening skin, reducing pores, scar healing and better texture
Free From
It doesn't contain any harsh alcohols, common allergens, fragrances, oils, parabens, silicones or sulfates
Fun facts
Cosiq is from India. This product is used in 4 routines created by our community.
We independently verify ingredients and our claims are backed by peer-reviewed research. Does this product need an update? Let us know.
What's inside
Ingredients List
3-O-Ethyl Ascorbic Acid 23%
Skin ConditioningPropanediol
Solvent
Active Ingredients:
3-O-Ethyl Ascorbic Acid 23%
Inactive Ingredients:
Propanediol
Key Ingredients
Benefits
Ingredients Explained
You might know this ingredient as Ethyl Ascorbic Acid, a more stable version of ascorbic acid.
Like other types of vitamin C, this ingredient has many benefits including reducing wrinkles, skin soothing, dark spot fading, and fighting against free radicals.
3-O-Ethyl Ascorbic Acid interferes with the process of skin darkening, helping to reduce hyperpigmentation. It also encourages the skin to produce more collagen.
Once applied, 3-O-Ethyl Ascorbic Acid is converted to Vitamin C deeper in the skin's layers. This process is slow but makes this ingredient more tolerable for skin.
The optimum pH range for this ingredient is 4 - 5.5
Learn more about 3-O-Ethyl Ascorbic AcidPropanediol is an all-star ingredient. It softens, hydrates, and smooths the skin.Â
It’s often used to:
Propanediol is not likely to cause sensitivity and considered safe to use. It is derived from corn or petroleum with a clear color and no scent.
Learn more about PropanediolReviews
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Where it's from
Cosiq is a Indian brand
Often compared with
We're dedicated to providing you with the most up-to-date and science-backed ingredient info out there.
The data we've presented on this page has been verified by a member of the SkinSort Team.
Read more about us· Updated February 12, 2026 • Added by sophnqr