500 mcg b12 injection Methylcobalamin (Vitamin B12) This is why B12 injections

But there is no published human study measuring how much of an oral dose actually reaches the bloodstream

Many patients experience: reduced appetite within the first few weeks gradual and consistent fat loss improved metabolic markers continued progress over several months Long-term success depends on maintaining sustainable habits that support metabolic health

Injections deliver B12 directly into the bloodstream, making them far more effective for those with deficiency

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Biophysics 260, 601608

While a B12 deficiency is not uncommon, it can take years to develop, and the signs and symptoms range depending on the severity and duration of the deficiencybut weight gain isnt likely to be one