Opinion on do's and dont's skincare ingredients cheat sheet?

In my opinion if the product already has both ingredients in, they would work with each other because it is formulated to. If you combine different products from different company, that might increase risk of irritation. After all there is not just one type of AHA, Retinoid, and Vit C They’re many in between. This is just a general rule

thats just wrong ! the myth that you cannnot combine niac and vit arosw from studies where they used very unstable and high potent forms of vitc and niac ! these were debunked by recent studies with stable and lower concentrations ! niacinamide can be combined with every ingredient and it works really well with vitc in terms of beightening

This is kinda the general rule. It all depends on the concentration and the formulation. If the product such as the ordinary peeling solution , it already being formulated with aha and bha together despite the high percentage. I am sure the dermatologist and chemist already considered the pro and cons before launching it. And vitamin c has lot of derivatives : 1. tetrahexyldecyl ascorbate (THD), 2.magnesium ascorbyl phosphate (MAP), 3.ascorbyll glucoside. 4.bis-glyceryl ascorbate 5. 3-O ethyl ascorbic acid 6. L-ascorbic acid ( pure form of vit c ) And etc. Since it is a derivatives , it is much more stable and gentle to skin hence it can be combined and used with other ingredients such aha bha without causing any irritation. At the end of the day , always listen to your skin. If it causes irritation, stop the usage and change your routine.

yesss! im totally agree for you. this cheat sheet doesnt work and you just have to go with your own skin, when you skin is comfortable then it was okay for layering those product

In my opinion, layering niacinamide with Vitamin C it's works very well. Because both of these ingredients have very satisfying results on my facial skin.