A recent study was conducted on 23 healthy males between the ages of 27 and 37. One group of men was administered 3,120mg of D-AA while a control group was given a placebo (salt solution) over 12 days. The group of men given D-AA had an average raise in testosterone of 42% as well as a 33% raise in LH levels compared to no increases in the placebo group.Testosterone is what makes a man… a man. But it also affects your metabolism, muscle mass, skin and sex drive. If you are 30+ years old odds are that your Test levels are declining every year. King Test is confidence in a bottle. More importantly, the ingredients have been proven in HUMAN CLINICAL TRIALS.