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Plant foods contain effectively zero bioavailable B12, so endurance athletes on vegetarian or vegan diets are at elevated risk

"Growth hormone releasing peptides and male fertility: Effects on spermatogenesis and hormone optimization." Andrology, 2023;11(4):678-685

In particular, the possibility of nerve regeneration is low in case of preganglionic injury, thereby necessitating nerve graft or transfer depending on the location and severity of the injury

[36] Vitamin B 12 deficiency is most commonly caused by malabsorption, but can also result from low intake, immune gastritis, low presence of binding proteins, or use of certain medications

For Some food sources of the vitamin include: However, a person with B12 deficiency may not be able to absorb enough of the vitamin from their diet