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One of the most common culprits behind that persistent, dragging fatigue is a lack of Vitamin B12

BPC-157 activates the FAK-paxillin pathway, which dramatically increases fibroblast migration to injury sites

Healthy Nervous System* Vitamin B12 is essential for nervous system function.* It is involved in the production of myelin, a coating that surrounds parts of nerves.* That coating acts like insulation, ensuring the messages are transmitted fast from one nerve cell to another.* When someone develops a Vitamin B12 deficiency, the NIH notes that they may have neurological symptoms like tingling, trouble walking, uncontrolled muscle movements, or confusion.* Obviously, none of these are ideal for a runner

Since B12 is water-soluble, meaning your body easily pushes out any extra through urine once youve absorbed what you need, there is no concern about overdosing on B12

Neurobiology of premature brain injury