illie
Dry/Sensitive
Yes you can. Niacinamide is the most "flexible" active I know that you can mix or used it with every actives. I think you better not mix Glycolic acid or any other acid with retinol or retinoid, higher chance to give your skin irritation
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skinvenue
Oily/Sensitive
If it's niacinamide only, then go for it. Just make sure not to mix your AHA with other actives like Vit C and retinol.
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