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They are NOT for human or veterinary use, not for consumption, not for injection, and not intended as drugs, cosmetics, or supplements

Athletes use B12 injections for performance recovery, while older adults benefit from prevention of age-related cognitive decline
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"The effect of B-vitamins on biochemical bone turnover markers and bone mineral density in osteoporotic patients: a 1-year double blind placebo controlled trial"
ACL surgery: able to run in a straight line after 4 weeks

Clinical & Experimental Immunology 116 (1): 2832