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Deficiency causes multiple problems, but adequate or excess B12 provides nothing but benefits to your energy, strength, and mental sharpness
It needs to be injected into a muscle I believe
Some studies have suggested that it may support fat metabolism, modest fat loss, and healthy body composition while maintaining a relatively favorable safety profile
[108] In addition, certain drugs may interfere with laboratory tests for the vitamin, such as amoxicillin, erythromycin, methotrexate and pyrimethamine
Certain health conditions such as intestinal or stomach problems, poor nutrition, cancer, HIV, pregnancy, old age, veganism and alcoholism can cause vitamin B12 deficiency
Published human studies used different routes and dose designs
