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Human evidence for precursors is mixed: some trials report good safety, but metabolic endpoints such as insulin sensitivity have not consistently replicated in people
Streiner, D
These effects relate to tissue growth and fluid changes in connective structures
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Are walk-in B12 shots really walk-in
Each injection should contain at least 5,000 mcg of pharmaceutical-grade methylcobalamin to be effective, and most patients notice improvements in energy, sleep, and mood within weeks of starting proper B12 therapy
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