Tia'm My Signature C Source 20% - 30ml (Former OST C20 Vitamin C) This best selling Vitamin C Serum from Korea promises a healthy skin through the fast and effective .. Product #: OSTC20PVCS Regular price: $21.50 $21.50 Out Of Stock

Tia'm My Signature C Source 20% - 30ml (Former OST C20 Vitamin C)

Availability: Out Of Stock

Price: CHF21.50

This best selling Vitamin C Serum from Korea promises a healthy skin through the fast and effective efficacy of Vitamin C. This serum contains 20% Vitamin C!

  • It smells like a  fresh citrus fruit and as as a natural anti oxidant, it is safe and can be used daily. It prevents early signs of aging, moisturizes and smoothens skin. It is also helpful in fading acne scars and other skin hyperpigmentation, produces collagen and restores and regenerates your skin, exfoliates dead skin cells including blackheads and tightens pores.
  • Important: Please read "how to use"
  • For all skin types.
  • **This is the former OST C20 Original Pure Vitamin C20 Serum: the brand name and product name have been changed, but all ingredients and elements in the product remained the same.

After cleansing and toning apply 2-3 drops of the serum to dry skin, like how you use ordinary serums or ampoules. It is recommend to be used in the evening. If you choose to use it in the morning, it is recommended to use some sunscreens

Please note that: slight tingling would be experienced at the first time of use, which should fade away in a few seconds or minutes. 


  • Since applying this serum could cause sticky feeling, a few drops of this serum mixed with your favorite toner would do the trick! Although some bloggers say that the sticky feeling is actually a temporary once you follow it up with your other skincare products. 


  • Please avoid using this product in tandem with high levels of BHA and AHA.
  • TIP: you can alternate the use of the BHA/AHA in your routine with Vitamin C. Like for example:  today use BHA/AHA, tomorrow Vitamin C; or mornings AHA/BHA, evenings Vitamin C. If you want to use all of them at the same time, you need to give each product at least a 30 minute wait before applying the next product (AHA/BHA/Vit.C)
  • Please store the bottle in a dark cold place preferrably in the fridge to avoid oxidation.
  • Sediment may occur in the neck of the bottle and at the bottom, which is safe. Browning of the liquid is a natural phenomenon of highly concentrated pure Vitamin C.
  • Hot weather causes oxidization or slight leakage of the Vitamin C serum. You may observe the following; “Slight leak, hissing sound, gassy - bubbles" since it is a natural phenomenon that can only appear to pure vitamin.
    This is safe to use as long as the color of contents is not dark yellow or orange which means it has been oxidized already. So please store the serum in cool places/fridge to avoid oxidation and using it within 6 months once you got the product.

Water, Ascorbic Acid, Ethanol, Sodium Lactate, Butylene Glycol, Glucose, Camellia Sinensis Leaf Extract, Rosa Davurica Bud Extract, Carthamus Tinctorius (Safflower) Extract, PEG-60 Hydrogenated Castor Oil, Sodium Hyaluronate, BIS-PEG-18 Methyl Esther Dimethyl Silane, Diethoxyethyl Succinate, Ammonium Acryloyldimethyltaurate/VP Copolymer, Xanthan, PEG-180, Gluconolactone, Beta-Glucan, Citrus Aurantium Dulcis (Orange) Oil, Zinc PCA, Panthenol, Niacinamide, Glycerin, Tocopherylacetate, Lecithin, Caprylic/Capric Triglyceride, Ubiquinone, Diisopropyladipate, Phenoxyethanol, Methylparaben

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