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glutathione sperm quality Comprehensive review on the positive and negative effects of various important regulators on male spermatogenesis and fertility Frontiers | Increasing age in
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doi: 10.1016/S0886-3350(00)00585-X

So vegans and vegetarians who dont eat any animal products should add some processed grains like fortified breads, crackers, and cereals

This helps resolve symptoms of deficiency, such as persistent fatigue, weakness, and neurological symptoms like numbness, tingling, or memory problems

J Agric Food Chem 55: 64666474, 2007

Vision Problems: Blurred or double vision due to damage to the optic nerve (rare but serious)

Shai, I., Schwarzfuchs, D., Henkin, Y., Shahar, D
