A nutrient often promoted for boosting focus and brain performance may carry an unexpected downside for men’s long‑term health, according to a new study.

Published in the journal Aging‑US on June 15, 2026, the research suggests that higher levels of the amino acid tyrosine in the blood could be linked to a shorter lifespan in men.

Researchers analyzed health and genetic data from more than 270,000 participants in the U.K. Biobank to examine whether these amino acids influence lifespan.

The team, led by Jie V. Zhao, Yitang Sun, Junmeng Zhang and Kaixiong Ye from the University of Hong Kong and the University of Georgia, used two approaches.