I got this when I was re-purchasing the salicylic acid cleanser because I am using prescription topical azelaic acid AND tretinoin. Both gels are very drying. Before adding the azelaic acid gel to my routine, I used hyaluronic acid serum from other brands and they were alright. However, I didn’t find it a necessity to keep in my routine. THIS product though? It’s making me think I may not actually have oily skin. Maybe my skin has just been dry and I didn’t know that I needed extra moisture. My skin always looks dewy after using this, and I can feel that it’s much more hydrated than just using moisturizer for hydration.