The Ordinary Niacinamide 10% and COSRX BHA Blackhead Power Liquid

I havent used it together but i recommend you to not using it on the same routine, afraid that it will be too much active on your skin :(

Hello, I use both of these products for my skin! It's awesome. Really helps my pores unclog and minimize my pores. I noticed a difference after two weeks of daily use. But if I stop using them my blackheads come back and my pores get larger again. I do not use the products together.

You can use both in same routine Layer thinnest to thickest Bha liquid first and once dry, niacinamide serum Limit bha use to 2-3x a week at night maximum to avoid damaging your skin barrier Niacinamide can be used am and pm everyday

I don’t use them in the same routine if I don’t have time to wait. Acids have a ph between 3-4, niacinamide has 5-7. When you use them consecutively, nia will raise the ph level of the acid thus rendering it ineffective. If you want to use them together, just make sure you wait around 30 mins after applying the BHA.