TL;DR — Key Takeaways Yes, sugar lowers testosterone, both short-term and long-term. In a 2013 study, a 75g glucose drink dropped testosterone ~25% for up to 2 hours. The bigger
TL;DR — Key Takeaways The evidence is mixed, weed doesn’t clearly lower testosterone, but heavy/chronic use may. THC can cause a short-term dip by blocking the brain’s GnRH signal (→
Does Soy Lower Testosterone? What the Research Says TL;DR — Key Takeaways No, soy does not lower testosterone in men at normal intakes. It’s a persistent myth. Multiple meta-analyses (dozens
TL;DR — Key Takeaways The #1 cause is excess body fat, men with obesity can have up to 50% lower testosterone. Poor sleep, chronic stress, and heavy alcohol are major
TL;DR — Key Takeaways Yes, but misleadingly. Dehydration concentrates red blood cells without adding any. It drops your plasma (the water in blood), so hematocrit reads higher. This is “relative” polycythemia, apparent, not a true
TL;DR — Key Takeaways No, creatine does not meaningfully increase testosterone. A meta-analysis found no significant effect. It doesn’t raise free testosterone either. The “creatine boosts DHT / causes hair
TL;DR — Key Takeaways Fasting doesn’t directly increase testosterone. In lean, active men, intermittent fasting can lower testosterone (~1–21% in studies). In overweight men, fasting-driven fat loss can raise testosterone.
TL;DR — Key Takeaways No, cold showers don’t reliably increase testosterone. Some studies even show a small decrease. The real, evidence-backed link is heat, not cold: excess heat harms sperm
TL;DR — Key Takeaways Yes, magnesium can modestly increase testosterone, especially free (usable) testosterone. It works partly by reducing testosterone’s binding to SHBG, freeing up more active testosterone. A key
TL;DR — Key Takeaways Vitamin D raises testosterone mainly if you’re deficient, the testes have vitamin D receptors. A year-long RCT found ~3,300 IU/day raised total testosterone ~20–25% in deficient
