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These injections contain a synthetic version of the vitamin called cyanocobalamin and are usually given directly into a muscle by a healthcare provider
The most reliable patient-reported benefit is resolution of B12-deficiency fatigue within 48-72 hours
The reduced amount of oxygen reaching the brain might be to blame for the thinking and reasoning problems
10.1007/s11901-006-0019-7 12 CastelliM
More research is needed to establish the connection of vitamin B12 with weight loss
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