10% Niacinamide Booster with 2% Mandelic Acid and Lactic Acid.

"Paula's Choice 10% Niacinamide is another great staple that a lot of people use in their skincare routine. I'm going to add a little warning to this one to say this has a 10% niacinamide. And this isn't going to work for everyone. 10% can work for some, but some might find it too sensitizing. If your skin can tolerate a 10% niacinamide and you're already using it, you could always swap whatever product you're reaching for out for this Paula's Choice one. It's going to work for some, but I would say 10% niacinamide can be a lot for certain people, particularly those that are prone to sensitivity."

"When you see a 10% niacinamide you're like do I really need 10%? It's double what the recommended amount is. Is that good? But then you get up into like the 20% and it's like wow, okay, now you're more likely to get irritation. The more you have of anything, it's not like the more of things the better it is. Sometimes less is more. Studies show 5% is sufficient for pretty much all your clinical endpoints. Between 10 and 15% you're probably going to tolerate it, not that it's more effective but the tolerability perhaps isn't terrible. But then you get a 20% and you're really quite far off of the ideal concentration balancing effectiveness and irritation potential."

"She goes in with the Paula's Choice niacinamide booster. I will say it does have a lot of niacinamide, I personally am not really comfortable using that much niacinamide on my face. I personally don't feel that concentration of niacinamide is necessary. From data we know that five percent niacinamide is the amount you need to see results, and sometimes overexposure to certain ingredients can push your skin into the sensitivity range. However, if she hasn't noticed any adverse effects to the product then I don't think there's a problem with it. I love Paula's Choice, I love niacinamide, I love that she's incorporating it into her routine."

"Niacinamide is a form of vitamin B3 and it is a really great all-around ingredient. This serum is the one that actually made a big difference on my skin and it made me really try out other niacinamide products. I've seen other people say the same thing, that this one is just the one that works the best for them. The texture is really watery and light. It's a water-based formula and it's very easy to incorporate into your routine because it's so light. It layers nicely under everything else. You can use it morning or night. I tend to use this every few nights, and if my skin is particularly irritated, then sometimes I'll just use this and nothing else for a few nights, maybe also with a moisturizer."