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.... That's what I read. Still can't calculate well... I don't understand when calculating multiple substances.

This would be water 100 ml Standard HA 1 g (99 baht) Nano HA 1 g. (129 baht) Alpha arbutin 2% = how many g? (Price 229 baht = 2g) Glucosamine 4% = how many g? ( Price 75 baht = 5g) Niacin 2% = How many g? (Price 45 baht = 7 g) How is this ratio calculated? Then it's not calculated. Then 100 ml of wa...

I want to try mixing the products myself. I'm 21 years old. I have a lot of clogged acne. Use whatever clogs Hadalabo was clogged. So today, it doesn't take care of anything. I have combination skin+large pores+dark spots, I've been using differin all the time, thinking of mixing hyaluronic acid but...