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In fact, a 2008 study found that after taking a 1,000 mcg oral supplement, only approximately 1.3% (or 13 mcg) of B12 was absorbed into the bloodstream
The theoretical risks are minor metabolic shifts (free fatty acid mobilization) and injection-site effects
In any case, vitamin B12 shots are most commonly administered by a doctor or naturopath, since many people struggle to administer injections themselves
B12 supports red blood cell formation, energy metabolism, and brain function and many people are deficient without realizing it
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