5min chapter

The Proof with Simon Hill cover image

Skincare, haircare and deodorant | Michelle Wong, PhD

The Proof with Simon Hill

CHAPTER

How Much Vitamin a Is Left in a Product?

Vitamin C and vitamin A are also quite unstable. So even if it says 1%, there's a good chance that if it's a brand that hasn't put a lot of effort into making a stable formula, a lot of that 1% may have degraded by the time it gets to you. The more effective ingredients, the ones with greater efficacy, evidence like vitamin A, vitamin C, chemicals, folients, you will probably get better results if you use them every day. But then the caveat is that if they're too irritating, then your skin is probably not going to be happy. You're probably going to get a lot of stinging. Your skin might just be red all

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