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Other signs may include shortness of breath, pale skin, stomach problems, such as constipation, diarrhea or gas, or nerve problems, like muscle weakness or tingling in fingers or toes. Over time, a deficiency of B12 can cause problems with balance, confusion, depression, poor memory and possibly dementia, and it can even cause permanent damage to the nervous system, Somers says

Rotating sites systematically allows any irritation to resolve before returning to a previously used location

Interestingly, these mechanisms seem to work somewhat independently of GH secretion

Exercise and the Immune System: Myokines, Inflammation, and Immunity Key myokines: IL-6, irisin, and their role in systemic inflammation