I am no fitness body builder, gym fanatic or ultra marathon runner. Yeah, I do run and I do go to the gym on occassion. But I found with work, family, volunteering; finding exercise time was challenging, especially when I am exhausted and tired. I felt I needed some tonic. I am no scientist, but I read a review somewhere about hormonal balance as you age, so I searched and came up with DNA Silverback. Testosterone, mixed with vitamins to give a natural perk. And the powder from DNA definately gives a lift. And this is not some multi vitamin tablet plasebo effect, but real mind and body effect! You do feel more lively, and spritley. Will I run faster? doubt it. But I will run a little more often!