US$ 28.90
b12 subcutaneous injection dose Shots Dosage for Adults: How Much and How Often Cyanocobalamin Injection, USP 1000 mcg
Description
But sometimes the bigger issue is this: Your stomach and digestive system may not be doing their job

According to NICE Clinical Knowledge Summaries and the British National Formulary , the standard treatment is intramuscular injections of 1,000 mcg (1 mg) hydroxocobalamin

Double-blind test on the efficacy of methylcobalamin on sleepwake rhythm disorders

Your GP should know this