Great in combination for hyperpigmentation with the APH and Cysteamine. I just mix this with the APN and seems to be working really really well. Skin just looks better across the board.
Great addition to APH and APC. I've been rotating with APH and using APC at night before washing my face. Some great results and think mixing it up has helped trick my skin into being more responsive to all three.
Use APTA, Cysteamine, Niacinamide and APH for great results. I can't tell if it's only one, or all of them together that work. Got serious about my routine and love the results and the brand.