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I’m wondering if the percentage of the Ordinary Niacinamide is too high for some & that’s why people are having reactions to it if they immediately use it everyday. Higher % =/= better. Many products contain Niacinamide in them already and 2-5% has proven to be effective. 
I’ve seen some estheticians say Niacinamide doesn’t react well with AHAs. I don’t know if I believe that because you’ll often see them formulated together in one product (I’m just thinking openly lol)
(I’m just thinking openly lol)
It could also be TO’s delivery system?
Some people are experiencing dryness too? Niacinamide should be hydrating...not drying
