For the apsirin, I use a Neutrogena shampoo called T-Sal, which contains salicylic acid. I use it to clear my scalp before applying the caffeine / niacinamide mixture, which is very easy to make yourself. I got a glass bottle like this one from Amazon,
Empty Amber Glass Spray Bottle
I bought ethyl alcohol from any pharmacy, and diluted it down to 20% with distilled water. Then dissolved a 4:1 ratio of powdered niacinamide and caffeine from PowderCity. I kept adding until it stopped dissolving.
niacinamide
Caffeine Anhydrous Powder
Then with a clear scalp, and the mixture applied for about 10 minutes, I do LLLT red light treatment, or I just go outside and get some sunlight on a bright day. This combination seems to be working synergistic wonders.