D‑aspartic acid ana talla‑ta a matsayin ƙara testosterone na halitta, amma gwajin da aka gudanar a kan maza 24 masu ɗaga nauyi ya nuna cewa shan 6 g a rana yana rage jimillar testosterone da kuma “free testosterone”. Shirin 3 g a rana, wanda ke kan yawancin lakabi, ba ya da tasiri. Bincike na tsawon watanni uku kuma bai nuna wani ƙara ƙarfi ko girman tsoka ba. Ga abin da binciken ya nuna, dalilin da yasa maza masu horo ke amsawa daban da masu zaman gida, da yadda za a kashe kuɗi da basira.
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