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For a deeper dive into the research, see our guide on B12 injection efficacy, or read real patient reviews

The FTO rs9939609 and MC4R rs17782313 variants relate to metabolic rate and appetite control, indirectly influencing cardiac workload during weight loss

In cases where absorption is compromised, high oral doses or very high doses (such as 1,0002,000 mcg) of vitamin B12 may be required to correct deficiency, as these can sometimes be effective alternatives to injections

Munib may recommend bloodwork to confirm deficiency and establish baseline levels, though testing isn't always necessary for patients with clear symptoms or known absorption issues