This has been well studied and discussed on this board; use the search feature to find more threads.
I've used both the T-Rez and Sustain Alpha; I did the T-Rez sublingually although I had some difficulty solubilizing it but got around that. I think I feel the Sustain Alpha working more because of the addition of the 7,8 Benzoflavone and it's effects, and I had yet to try Reverse to I can't comment on that. I like it as a long-term health supplement though.