Is Zink useful for Schlaf?

The provided context does not include specific evidence on zinc and sleep. In general, zinc is an essential trace mineral involved in melatonin synthesis and neurotransmitter function. Some observational studies suggest low zinc levels are associated with poor sleep quality, but high-quality clinical trials are lacking. Therefore, the evidence is rated as 'unclear'. Supplementation may be considered only if deficiency is confirmed via blood test. Excessive zinc intake (above 25–40 mg/day) can cause nausea, copper deficiency, and immune dysfunction. Without a proven deficit, the benefit for sleep is uncertain.