Can zinc genuinely improve sleep—or is it just another supplement riding good marketing? In this Mini Mikkipedia episode, Mikki unpacks what the research actually shows about zinc and sleep, with a specific lens on midlife women and endurance athletes. She walks through the proposed mechanisms—GABA-A receptor modulation, neurotransmitter balance, melatonin synthesis, and circadian rhythm regulation—before cutting to the critical point: zinc only appears to improve sleep when it corrects a deficiency. Drawing on a 2024 systematic review of randomised trials, Mikki explains why benefits show up in populations like older adults, shift workers, and clinical patients, but not in well-nourished athletes using ZMA. The episode also covers zinc deficiency risk factors, menopause-specific considerations, copper–zinc balance, testing strategies, and practical dosing guidance—so listeners can make evidence-based decisions rather than chasing “super sleep” promises.

Key Topics Covered

• How zinc influences sleep physiology (GABA, melatonin, circadian genes)
• What human trials actually show about zinc supplementation and sleep
• Why ZMA fails in well-nourished athletes
• Zinc deficiency risk in athletes and midlife women
• Copper–zinc ratio, testing, and safe supplementation guidelines

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