By Wishtrend · Korea
Pure Vitamin C 21.5% Advanced Serum
$34.00
21.5% pure ascorbic acid with Melitane and amino acids. Maximum-strength vitamin C for experienced users. Brightens dramatically and prevents UV damage.
The Story
By Wishtrend set out to make vitamin C accessible and correctly formulated. 21.5% is their sweet spot — above COSRX's 23% threshold causes instability; below 15% lacks clinical efficacy.