Does taurine work against ageing?

Taurine occurs naturally in your body, but levels decline measurably as you get older. This has been observed consistently in humans, mice and monkeys¹. Lower taurine levels in humans are associated with more age-related conditions, but that is a correlation, not proof that taurine is the cause. Interestingly, exercise temporarily raises your taurine levels, which may partly explain why physical activity is good for you.

In mouse and monkey studies, taurine supplementation produced impressive effects: a longer healthy lifespan, and in mice also a longer total lifespan. Multiple ageing processes were slowed, including senescent cells that linger in the body, damage to genetic material, and chronic low-grade inflammation¹. That breadth makes the mechanism biologically plausible.

For humans the picture is very different. There are simply no good trials yet demonstrating that taurine supplements slow ageing or extend lifespan. The researchers behind the largest review state this explicitly themselves¹. All human data at this point are observational. There is a theory that taurine acts as a kind of 'conditional vitamin': when levels are deficient, the body might switch to survival mode at the expense of repair, but that remains a hypothesis².

There is also a complicating finding: older adults with chronic conditions actually showed higher taurine production, and that higher production was associated with worse cognitive performance³. This most likely reflects a compensatory response by the body to illness, rather than harm caused by taurine itself. But it does show that the relationship in humans is more complex than in animals.

In the field of Alzheimer's disease, a protein that pumps taurine into cells was found to be nearly three times less active in Alzheimer's patients than in healthy peers⁴. This is an interesting clue, but clinical evidence on taurine supplementation in Alzheimer's disease is still completely lacking.