A study in mice found that niacin supplementation increased NAD+ levels in the testes, which led to an improvement in sperm count and sperm motility. NAD+ deficient mice have ~30% smaller testes (balls) than the control mice (~1.5g vs ~2.17g). NAD+ is essential for spermatogenesis and that NAD+ deficiency leads to male infertility.
Most "niacin" products are niacinamide. If you want the form discussed in this research, look for nicotinic acid specifically.
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