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I take Metformin every day and have not had any side effects (including diarrhea).

What's your reason for taking it? The purported longevity benefits?

Yes, I take it for the possible longevity benefits.

Same here

I stopped a while back when I read that it reduces testosterone level significantly: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5296448/#:~:tex....

Do you notice anything to support this?

nope - no side effects at all that I can tell