The vitamin niacin has a life-prolonging effect. Scientists from ETH Zurich have demonstrated this in roundworms.

As an international team of researchers headed by Michael Ristow, a professor of energy metabolism, has now experimentally demonstrated, niacin and nicotinamide take effect by promoting formation of so-called free radicals.
"In roundworms, these reactive oxygen species prolong life," he said.
This might seem surprising as reactive oxygen species are generally considered to be unhealthy.
Ristow's view also contradicts the textbook opinion championed by many other scientists.
Reactive oxygen species are known to damage somatic cells, a condition referred to as oxidative stress.
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Many scientists believe that antioxidants are beneficial to health.
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Source-ANI