Popular Supplement Ingredient Linked to Shorter Lifespans in Men

Key Points:

• A study published in Aging-US on June 15, 2026, found that higher blood levels of the amino acid tyrosine may be linked to a shorter lifespan in men, potentially reducing life expectancy by nearly a year.
• Researchers analyzed data from over 270,000 participants in the U.K. Biobank and used genetic methods to suggest a causal relationship between elevated tyrosine levels and mortality risk in men, with no significant effect observed in women.
• Tyrosine, involved in neurotransmitter production and metabolism, is commonly found in protein-rich foods and supplements aimed at boosting focus and brain performance, but its elevated levels might contribute to insulin resistance and stress response disruptions.
• The study does not directly implicate tyrosine supplements as harmful since it only assessed natural blood levels, but it raises questions about the long-term health impact of high tyrosine and suggests further research is needed.
• These findings highlight the complex role of nutrients linked to brain function in aging and suggest that monitoring tyrosine levels could be important for men's health in the context of longevity.