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DIM.

Zinc.

Fenugreek.

Tribulus terrestris.

Tongkat Ali.

The one thing known to work is to sleep longer hours. Testosterone peaks during REM sleep so not abusing things that suppress REM sleep (sleeping pills, cannabis etc.) is a good idea. Sleeping late...

Interestingly, Trimix contains phentolamine, alprostadil and papaverine.

I tried out phentolamine back in Brazil where it was available tablet form (name = Vasomax). It worked less well than...