b12 injections mcg Vitamin for Injection Cyanocobalamin 1,000 mcg, 25/Box (Rx) — Mountainside Medical 12 intake or intestinal malabsorption in swine and horses Sold in a 100 mL vial Why Use It Certain health conditions could cause Vitamin B12 deficiency Sandoz Vitamin B12 Injectable Solution

The vitamin B12 forms cyanocobalamin and occasionally hydroxocobalamin can be administered by intramuscular injection to treat deficiency or cases of malabsorption

Moreover, certain medications, including metformin, proton pump inhibitors, and antacids may also reduce your bodys ability to absorb vitamin B12 from your diet (1, summary Vitamin B12 deficiency can manifest itself through a variety of symptoms

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Metformin and risk of vitamin B12 deficiency: new advice

As for the pill - I have not had a good experience myself - it just did not do good things for my body, however I have heard in younger women it does marvels for regulating periods - so am surprised you are getting intermittent bleeding - worth another poke at the docs perhaps