O.S.T vitamin C20 serum review
New name of this product is TIAM C source
Water, Ascorbic Acid, Alcohol, Sodium Lactate, Butylene Glycol, Glucose, PEG-60 Hydrogenated Castor Oil, 1,2-Hexanediol, Phenoxyethanol, Sodium Hyaluronate, Bis-PEG-18 Methyl Ether Dimethyl Silane, Xanthan Gum, Diethoxyethyl Succinate, Ammonium Acryloyldimethyltaurate/VP Copolymer, Carthamus Tinctorius (Safflower) Flower Extract, Citrus Aurantium Dulcis (Orange) Peel Oil, Glycerin, Zinc PCA, Panthenol, Niacinamide, t-Butyl Alcohol, Camellia Sinensis Leaf Extract, Beta-Glucan, Tocopheryl Acetate, Lecithin, Caprylic/Capric Triglyceride, Ubiquinone, Diisopropyl Adipate
What is Vitamin C
Helps with collagen production
Acts as an anti-oxidant and restores and regenerates the skin
How to use it
Apply two or three drops to your entire face when you normally apply your serums, that is after toner and before moisturizer.
My thoughts on O.S.T Vitamin C serum (TIAM C source)
Before I bought this I heard so much about it. It really was a product everybody seemed to love, and really sold a lot. I decided to buy it to try and even my skin tone.
Used to fade acne scars and help with hyperpigmentation, even the skin tone and firming the skin
This product comes in a dark glass bottle with a dropper. The bottle is dark due to risk of oxidization. I feel that the best way to store it is in the box in the refrigerator and it will keep it from oxidizing too fast. The temperature and the lack of light will make it last a little bit longer.
Directly after applying it the skin will feel a little bit sticky, this goes away when you apply the rest of your products over it.
Is it okay to use my serum after it turned brown?
This is very much debated and opinions still differs on the matter. When Vitamin C oxidizes due to light or air it turns brown. What happens is that: the vitamin C molecule contains two electrons, when the first one is used (due to light or air exposure) the molecule becomes somewhat stable, when the second electron is lost, the product oxidizes and turns into dehydroascorbic acid. The browner your product get the more reaction it can cause your skin. So, I would definitely not recommend anyone using a brown serum, if its more on the orange side I would still use it.
When you buy this product fresh it is almost completely clear and the longer you have it, the product will become more orange and then finally brown. I would still use mine if it is slightly orange but not when it is dark in color. I guess it is for you to decide and some will say that you can’t use it as soon as it is a little orange and some will say it is fine. The decision is truly up to you.
I give this product 4/7
Where to buy it
8% discount code at BB cosmetics A6OG7773V8Z
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