1. Between Ascorbyl Tetraisopalmitate and Ascorbyl Glucoside , which one is more prominent, faster results, less irritation? Suitable for more sensitive skin.

2.Additional, why Tetraisopalmitate cannot be combined with Niacinamide + Zinc PCA ?

hello

Both of them do not irritate the skin. If used at the specified rate

As for the results, there are no direct comparisons of research results.

Some Vitamin C groups have complex problems with Niacinamide , which causes discoloration. due to the change in the chemical structure