Longevity supplement loved by biohackers doesn't slow down aging

A supplement beloved by Bryan Johnson and other biohackers for its age-defying properties might be flawed, new research reveals.

Previous animal , an essential amino acid that supports immune health and nervous system function, declines with age.

It's found naturally in the body, in various high-protein foods, and it is also added to energy drinks for its potential to enhance mental and athletic performance.

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