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Examine.com reports most benefits are from animal studies
Many people turn to B12 injections for weight loss, hoping for a boost, and in some cases, they do feel better
A May 2025 study in Molecular Therapy from the INc-UAB showed that gene therapy increasing secreted klotho (s-KL) in mice extended lifespan by 15-20% while improving muscle, bone, and cognitive health at 24 months of age (equivalent to ~70 human years)
Each has different absorption characteristics, and the most appropriate method should be determined in consultation with a qualified provider: Administration methods Subcutaneous injection the most studied method
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