Vitamin expert brand C20 released new and improved pure Vitamin Serum, PURE VITAMIN C 21.5 ADVANCED SERUM. C20 is the new name of  O.S.T, which is known as Original Pure Vitamin C 20 Serum. This Vitamin C20 serum recorded the best seller in for 3 years in a raw, and also known as ‘The miracle of one red bottle’ by customers in the world. C20 developed the maximized formulation of  Vitamin C in 21.5 advanced serum due to the massive support and demand of global C20 fans.


Pure Vitamin C21.5 Advanced Serum contains Hippophae Rhamnoides Water instead of water, and high concentrated Ascorbic Acid for skin whitening, restoring and skin moist balance with the optimal 21.5% of pure vitamin C.


What is the main difference between

Original Pure Vitamin C 20 Serum & Pure Vitamin C21.5 Advanced Serum?

C20 Serum, 2013, 2014 Wishtrend Awards Winner for 2 years in a row. We met over 10K of global customers and received various & valuable feedback from them. There’s no room for downgrading with C20, but for the maximum effect  of C20 Serum, we developed C21.5 advanced Serum.
1) Pure Vitamin C21.5

Our R&D found the solution of the maximum quantity of stabilized Vitamin C in 1 bottle.

21.5% is the optimal point of the liquid, and 30ml bottle of Pure Vitamin C Advanced Serum contains 6450ppm of water-soluble Vitamin C.
2) Ingredients upgrade

– Change the Water to Hippophae Rhamnoides Water, which contains more Vitamin C and E.

– No Paraben

: To reduce the oxidization of Vitamin C, preservative is essential. Although Vitamin C 20 Serum contains methylparaben inside, it is the minimum quantity to reduce the oxidization.

C21.5 Serum has more simple ingredients than C20 Serum and contains only for maximizing the effectiveness of Vitamin C Serum.

Water : Hippophae Rhamnoides Water (70%)
Vitamin C : Ascorbic Acid (21.5%)
Moisturizing : Sodium Lactate, Sodium Hyaluronate, Panthenol
Soothing : Cassia Obtusifolia Seed Extract, Allantoin
3) Texture upgrade

Minimized the stickiness of Vitamin C Serum
4) Absorption upgrade

Reduced the stickiness of Vitamin C
5) Storage & usage

Same as Vitamin C20 Serum

You can find Pure Vitamin C21.5 Advanced Serum now only in

C20 Serum wholesale & distribution :