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Each vial contains 40 mg of B12
The 2025 IV pilot measured cardiac, hepatic, renal, thyroid, and glucose biomarkers and reported no abnormalities (Lee et al., 2025), which gives a sense of what those investigators considered worth checking
BMJ Open 4 (5), e004501
This is particularly relevant because so many injuries (chronic Achilles tendinopathy, rotator cuff tears) occur in areas with inherently limited blood flow
Generally, once a person is injected with a dose of intramuscular B12, he or she will receive another dose after ten days
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