Can I use BHA AND NIACINAMIDE

Yup you shouldn't run into any problems! Use the BHA first since it has a lower pH level and follow up with the niacinamide

I agree with the other answers, it should be fine.

Yeah that should be fine!

I agree with the other answers. You could use both, bha first, then niacinamide. It’s recommended to use them around 30 minutes apart or at different times of the day for better results. For example, niacinamide in the morning and BHA at night.

yep! agree with others as well :-)