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Older couple walking together to exercise

Answer:

Urolithin A is a natural compound formed by the bacteria in the colons of about half of elderly people after consuming certain foods. Urolithin A seems to improve the function of mitochondria (the "powerhouses" inside our cells). However, clinical research with urolithin A suggested only limited benefit in improving muscle health in middle-aged and older adults. Urolithin A has also been touted for treating osteoarthritis (painful, worn joints) and preventing kidney damage, but has it been shown to be helpful in people? Find out in our full answer by signing in as a CL member.

Also see our separate article about other supplements for building and maintaining muscle.

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