[Product Question] Has anyone tried Cos de BAHA Niacinamide 5% Toner? Is it good for pigmentation?

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I don't know is it worth to try? is the 5% Niacinamide enough to fade PIH?I have Tretinoin and Azelaic Acid in my routine and consider to add niacinamide (again) in my routine to help fading pigmentation. I've tried Nacific Phyto Niacin essence and worked great with Tret in fading pigmentation, but always gave me cystic acne in my jawline :(
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Submitted by xmotuv