Using HEC with Salicylic Acid, Niacinamide and Azelaic Acid?
I got an email question about formulating with HEC (hydroxyethyl cellulose), salicylic acid, niacinamide and azelaic acid. Immediately I was...
I got an email question about formulating with HEC (hydroxyethyl cellulose), salicylic acid, niacinamide and azelaic acid. Immediately I was...