In this vid, I discuss the popular “Testosterone booster” supplement D-Aspartic Acid (DAA) and update my opinions of this general category of supplements. Note the 2015 study below published found at higher doses, it actually lowered testosterone. The 2016 study, found no impact on T levels, but improvements in strength on squats and a positive “trend” on the bench press.
Study mentioned in the vid:
D-Aspartic acid supplementation combined with 28 days of heavy resistance training has no effect on body composition, muscle strength, and serum hormones associated with the hypothalamo-pituitary-gonadal axis in resistance-trained men
PAGE UPDATE: 2016
This new study found no impact on T or body composition, but did find a statistically significant effect on strength. The study was short and given more time, it’s possible there would be improvements in body comp (as being able to lift more weight in a given lift usually leads to positive changes in body comp) but it was a short lived and small study, so no real conclusions can be made from the results, other than DAA appears to have increased lifts in the short time period. It’s also possible, especially when viewing it in the larger picture of other studies, the DAA was not responsible for the effects found in the study and it was due to some confounding variables they didn’t account for.
Effect of Aspartate Supplementation on Athletic Performance and Testosterone Levels in Young Men