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Do not layer your vitamin C serum with strong actives like AHAs, BHAs, or retinols
What separates them is what they were specifically built and validated to do, and that distinction is what determines which one is right for which patient
Bottom line: Vitamin C is safe for both topical and internal use, but starting with a moderate supplement dose and a dedicated lip-safe topical product is the best way to avoid irritation
Reliable references such as a peer reviewed review published in the National Institutes of Health PubMed Central library on how NAD+ metabolism is regulated across aging and disease reinforce that supervised, evidence informed care is the safest path with any wellness therapy
You should talk to your doctor about the best kind of birth control to use while you are taking Topiramate
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