Can Zink help with fertility?

The provided knowledge contexts contain no information about zinc and fertility. Generally, zinc is known to play a role in sperm quality and oocyte maturation, but evidence for routine supplementation to improve fertility is limited. Zinc deficiency can impair fertility, but in well-nourished individuals, extra zinc usually provides no benefit. High doses can be toxic (nausea, copper deficiency). Therefore, zinc should only be supplemented after medical consultation and ideally after a blood test. The given context data refer to other genes (TNF, MC4R, VDR, APOA5, ACE) and topics (weight, vitamin D, triglycerides, bloating, endurance) and provide no direct evidence for zinc's effect on fertility. The evidence level is thus unclear, based on general physiological knowledge without specific sources from the provided context.