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.
Nutr Res. 2013 Oct;33(10):803-10. doi: 10.1016/j.nutres.2013.07.010. Epub 2013 Aug 15. Nutr Res. 2013. PMID: 24074738 Clinical Trial.