Oh wise formulator, quick questions regarding niacinamide- so this being an amide is clearly on the alkaline side and instructions clearly say best at pH 5.5 or above. Its reactions with vitamin C are well known for the same reason ( acid alkali reaction and bam- nicotininc acid !!!)
My question to you is two pronged:-
What has been the optimal pH you all have strived while using niacinamide- given the fact that most of the other ingredients in skin care are usually acidic and not to mention- absorption is best at pH closest to skin- again acidic.
Second , some supplier- say that they supply niacinamide PC ( not USP) which has minimal nicotinic acid hence less irritative and then you are not bound by the ph as much- but of course, this one is way more expensive- is it worth it ? any benefits of niacinamide PC over USP- in your opinion
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