inject b12 into fat or muscle Injections & Weight Loss: What the Evidence Says – Bolt Pharmacy why do you get b12
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These are modest but measurable results when combined with disciplined nutrition
Man-Made Form : Vitamin B12 injections are a man-made form of the vitamin

What matters far more than the exact route is whether you needed the injection in the first place, and whether the dose and schedule are right

Enjoy feeling great from regular B12 injections in the comfort of your own home
The second is dose and route translation : even where an effect is real in a mouse, the human-equivalent dose is not a simple body-weight scaling, and as the route section above stressed there is no human bioavailability figure to anchor an oral-versus-injected comparison
The idea of over-firing due to extra receptors is speculative