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does b12 injections give you more energy Most people assume a injection is simply… a B12 injection. One vitamin, one option and one answer. The reality is a little nuanced than that. When somebody comes into my If you have a low
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With the right treatment, recovery is possible
Among 113 Guatemalan women, plasma vitamin B-12 was deficient or low in nearly 50%, breast milk vitamin B-12 concentration was low in 31%, and low breast milk vitamin B-12 correlated significantly with infant urinary MMA (21)

Last reviewed: April 2026 Next scheduled review: October 2026 (FY2027 update) Ready to turn this knowledge into a credential

Deficiency of vitamin B12 may cause tiredness, weakness, constipation, loss of appetite, weight loss and megaloblastic anemia (a condition when red blood cells become larger than normal)

Excess methionine could lead to irritability or a powerful sulfur odor