Evidence check: Zink in the context of longevity

The provided context does not contain any direct information about zinc in the context of longevity. Therefore, the following answer is based on general scientific knowledge, not on the given sources. Zinc is an essential trace element involved in immune function, DNA repair, and antioxidant defense—processes linked to aging. A moderate zinc status appears associated with better immune function in older adults, while both deficiency and excess can be harmful. Evidence for a direct lifespan-extending effect of zinc supplementation in humans is weak and mainly derived from observational studies or animal models. Clinical trials show mixed results, especially in well-nourished individuals. High doses can impair copper absorption and promote oxidative stress. In summary, zinc is relevant for healthy aging but not a proven longevity elixir. Supplementation should only be considered after confirmed deficiency or under medical guidance. The evidence is rated as 'mixed' due to heterogeneous study outcomes.