I found this interesting I increased my Testosterone by 71% (from 371 to 635) naturally in three months. Here's how... • /r/Fitness
The first comment citing this study https://academic.oup.com/edrv/article-lookup/doi/10.1210/er.2009-0041
I add this haidut's post here,
Topical T3 Testicular Application - Estrogen!