To make this useful, I think you need to do the following things:
1) Educate people on good practices generally. Your current site looks to me to be an invitation to be someone's guinea pig and pay for the privilege instead of being paid.
2) Offer doubleblinded kits for a wide variety of supplements that people can choose from. The one supplement you are currently offering is one I never heard of. So I don't care. But I might care if you offered me the chance to pick and choose from a list of supplements.
I am no longer taking supplements, but I did take a lot of supplements at one time. I can see a service like this having a use for people, but not in its current format.
Also, I would remove the phrase "self experimentation." That sounds incredibly Dr. Jeckyl and Mr. Hyde to me. "Self testing" might be okay, but that's a terrible phrase and should be stricken from company vocabulary.