Testicular sperm production is supported by androgens, which require steroids and proteins for synthesis, as well as amino acids. Moderate and reasonable protein intake can be beneficial, but excessive consumption may have adverse effects.

On September 18, 2018, the Asian Journal of Andrology published an experimental study by European experts highlighting the potential impact of high protein supplementation on sperm quality during fitness and resistance training. Over the past decade, particularly among young men at commercial gyms, excessive protein supplementation has become increasingly popular.

The study evaluated 20 infertile men who ceased protein supplementation for 2–16 months. Semen analysis revealed:

  • Median sperm concentration increased by 2.6 times, showing statistical significance.
  • Total sperm count increased by 2.1 times, though this was not statistically significant.
    However, during follow-up, five participants experienced a slight decline in sperm concentration.

As of the time of publication:

  • 14 out of 20 participants underwent intracytoplasmic sperm injection (ICSI).
  • 12 had achieved live births or had pregnant partners, while one required donor sperm.

For men aiming to conceive, avoid blindly consuming large amounts of protein. Moderate supplementation tailored to individual needs is advised. While this study provides insights, more research is necessary to draw definitive conclusions.