Can I use The Strong Acid with RETINOID 3?Updated 9 days ago
You can use both The Strong Acid and Retinoid 3 so long as they are used in separate routines. For example, you could use The Strong Acid in the AM and Retinoid 3 in the PM, or use the two products on alternate nights.
Use The Strong Acid as your tone step, after cleansing. Apply your acid before The Amplifier and follow with your other serums/moisturiser.