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zoozoo
Dry/Sensitive
i never try this but i think it was fine to mix niacinamide

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Cleoangel
Oily/Sensitive
Alright thank you ✨ The serum will be expiring soon and I don't want to waste it.

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Bazz
Dry/Resilient
Should be fine. I had a Tiam Niacinamide and they said I could mixed it with essence or serum. Moisturizer is probably the same too

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