What product is best for fading dark spots on african american?

Depends on the spot. Fading dark spots on dark skin is difficult and dependent on what caused the dark spot in the 1st place., how long it has been there, and where in the skin (depth) it is. Best advice is to see a dermatologist who can evaluate the pigmentary changes and help provide the best treatment options (bleaching agent, lasers, surgery, tincture of time etc.). Good luck.