D-Aspartic Acid (DAA) Powder is a men’s health supplement linked with healthy production of the male hormone testosterone. DAA in the brain helps stimulate the production of growth hormone, which then influences testosterone levels. Through maintaining optimum testosterone levels in the blood, DAA promotes muscle strength and body building, increased energy, and improved mental state in men. - See more at: http://www.tasmanhealth.co.nz/d-aspartic-acid/

They are essential amino acids and are available primarily in supplements like whey protein or testosterone booster.

If you are seeking to increase your testosterone levels utilizing the best testosterone boosters, then you definitely must know that there are many ways of getting the desired effects.