Intramuscular vs Subcutaneous Vitamin B12 Injections Vitamin B12 can be administered using two methods
Some people really are more likely to run low on B12: Vegans and vegetarians, since B12 comes mostly from animal foods Adults past about 60, who tend to absorb it less well Anyone with gut or absorption issues, from Crohn's and celiac to weight-loss surgery People on certain medications, including metformin and long-term acid reducers The shot itself takes about a minute
This reaction has two consequences studied in the literature: it consumes S-adenosyl methionine, the cells principal methyl donor, and it removes nicotinamide from the salvage pathway that regenerates NAD+
Leafy greens, avocados, and bananas provide potassium
If youre uncomfortable with self-injection, you can arrange to have a nurse or health professional administer it at an office or clinic