b12 injections mcg Vitamin for Injection Cyanocobalamin 1,000 mcg, 25/Box (Rx) — Mountainside Medical Deficiency can result in anemia Vitamin B-12 Injection, 5,000 mcg/mL,

Symptoms can develop quickly and include: feeling faint or lightheaded difficulty breathing or wheezing rapid heartbeat confusion anxiety clammy skin collapsing or losing consciousness hives swelling stomach pain, nausea, or vomiting If you or someone nearby develops these symptoms, you should: Check to see whether they have an epinephrine pen

The B12 Vitamin Helps You Sleep Better Melatonin is produced by the B12 vitamin, which regulates our sleep and waking cycles

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5 Conclusion This systematic review and meta-analysis indicate that sublingual and oral vitamin B12 administration provide efficacy comparable to intramuscular injection in improving serum cobalamin levels and reducing hyperhomocysteinaemia

The honest answer is that a raised B12 on its own usually causes none: any symptoms you do have are far more likely to belong to whatever caused the elevation than to the vitamin