[skin concerns] Niacinamide

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Hi, I’m new to this sub & kinda new to skincare too. I have a decent amount of acne and combination skin, and I thought I would try out TO’s Niacinamide 10% + Zinc 1% toner. The first time I tried it on, I put wayyyyyy too much, I don’t know what I was thinking, and it stung like hell. Today I’ve tried incorporating it into my routine again, but a tinier dosage and I still feel a slight stinging (although way less than last time, for obvious reasons). Has anyone else had this sort of reaction? Could I just be sensitive to the ingredient?Even after using too much, my skin wasn’t red, irritated, or drier than before or anything, that’s the odd part. I know for a fact I messed up my skin barrier with a bad habit of over-exfoliating and I’ve been trying to heal it. Is it possible the sensitivity to Niacinamide could be caused by a broken skin barrier as well?Sorry if it’s a stupid question, like I said I’m new and I’ve been trying hard to gently incorporate new things into my routine and it had been going so well until now 😩
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Submitted by EitherDependent