Active Ingredients NOT to mix

Some active ingredients go well together that benefits the skin but some should NOT to mix More posts like this on my Instagram: https://www.instagram.com/p/CTIwhNDJTN6/?utm_medium=copy_link Thank you to those that stating Niacinamide can use together with vitamin c for skin brightening effect. I’m aware of updated articles that support this claim. However, I tried it in the past those 2 together, doesn’t work for me so I include it here as should not mix for those with sensitive, redness, acne prone and problems skin. ❤️❤️