I have been searching for niacinamide alternatives since it irritates my skin, and this stuff is perfect! It really is as gentle and effective as it claims to be. I especially love that it can be used both at night AND in my morning routines for maximum results. I have been using it for a few days now, have experienced no irritation whatsoever, and I can already see a big difference! My dark spots are lighter, and the redness in my face is disappearing. I can’t wait to see results with continued use.