Hello. 1. You can use up to 1.0%, but normally recommend at 0.5% due to the high usage rate. Can irritate the skin. 2. Can do. Please see the sample formula group.
whitening can be obtained from
ศูนย์รวมสูตรเครื่องสำอาง 3. Other types of cream maker can be used but must consider the stability of The formula, as chosen, is
Light Lotion Maker +
Xanthan Gum is suitable for this formula.