Vana, I prefer salicylic acid because we have more research backing it up.

Thank you in advance

Fatima, you can use niacinamide in the morning and azelaic acid at night. A couple of nights a week, use Mandelic Acid after cleansing.

Wava, glad to hear you’re getting into the science of skincare too. It’s fascinating, isn’t it?

I don’t recommend using more than one exfoliant in your skincare routine. When you use two, you remove double the amounts of dead cells, so there’s a higher risk of irritation and dryness. Instead, I’d use Mandelic Acid for a month and Cosrx for another month and see which one your skin likes best.