Andro 400 is a natural ingredient formulated supplement that claims to boost testosterone and increase performance in men. Wasserman, K., Whipp, B.J., Koyl, S.N. & Beaver W.L. (1973). Anaerobic threshold and respiratory gas exchange during exercise. Journal of Applied Physiology. Volume 35, No. (2), pp. 236-243. Toussaint, H.M. & Hollander, A.P. (1994) Energetics of competitive swimming. Implications for training programmes. Sports Medicine. Volume 18, Issue (6), pp. 384-405.

Baumgart, C., Hoppe, M.W. & Freiwald, J. (2014) Different endurance characteristics of female and male German soccer players. Biology of Sport. Volume 31, Issue (3), pp. 227-232. The Journal of Urology– Most of the research on saw palmetto has to do with prostate and urinary health, not libido and testosterone. Weston, A., Myburgh, K., Lindsay, F., Dennis, S.C. Noakes, T.D. & Hawley, J.A. (1997). Skeletal muscle buffering capacity and endurance performance after high intensity interval training by well-trained cyclists. European Journal of Applied Physiology. Volume 75, Issue (1). pp. 7–13.Fenugreek has several studies to show it boosts libido in men. It is a natural ingredient that is thought to help the sexual life of men who use the herb.

Billat, L.V. (2001). Interval training for performance: A scientific and empirical practice. Special recommendations for middle- and long-distance running. Part I: aerobic interval training. Sports Medicine. Volume 31, Issue (1), pp. 13-31.Unfortunately, users may experience some effects as per the ingredients in the formula, which include dizziness and diarrhea. Nugenix Craig, I.S. & Morgan, D.W. (1998) Relationship between 800-m running performance and accumulated oxygen deficit in middle-distance runners. Medicine & Science in Sports and Exercise. Volume 30, Issue (11), pp. 1631-1636. No variation of the Contract, whether about description of the Goods, Fees or otherwise, can be made after it has been entered into unless the variation is agreed by the Customer and the Supplier in writing. Virectin says it works on various male sexual functions, including blood flow to the penis, boosting libido, and energy.