"And while several studies suggest testosterone levels are lower in those on a plant-based diet than in those on a meat-based one, research by the British Journal of Cancer suggests a vegan diet actually increases them."
https://www.bbc.co.uk/sport/formula1/41416402

"Summary
Mean serum insulin-like growth factor-I was 9% lower in 233 vegan men than in 226 meat-eaters and 237 vegetarians (P= 0.002).

Vegans had higher testosterone levels than vegetarians and meat-eaters, but this was offset by higher sex hormone binding globulin, and there were no differences between diet groups in free testosterone, androstanediol glucuronide or luteinizing hormone. © 2000 Cancer Research Campaign"
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2374537/pdf/83-6691152a.pdf
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