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B12 supplementation does not enhance metabolic rate or promote fat loss in people with normal B12 status

Originator Merck carried it through Phase 2 trials and a Phase 2b hip-fracture study but never filed for approval, so there is no FDA-approved prescription version

58(Suppl 1): 37-52

Online retailers market them as "research chemicals" with disclaimers ("not for human use") while influencers inject them on camera

[14] Contamination risks: Products not supplied through regulated channels may lack quality assurance, potentially containing contaminants or incorrect dosages

If your expectation is "specific fat reduction in stubborn areas with preserved lean mass," you'll likely be satisfied