At Which?, Shefalee is a principal researcher, researching and writing food and nutrition content for our magazine and website, and overseeing all our supplement reviews
Clinical guidance for intramuscular injections points to a 22 to 25 gauge needle, given at a 90-degree angle, with the length chosen so it reaches muscle without going too deep
Its a targeted signal that doesnt touch the parts of growth hormone associated with side effects, and that makes it all the more promising for future studies
Cyanocobalamin is the most widely available synthetic form, is shelf-stable, and is FDA-approved for treating B12 deficiency
I use some folded loo roll over the top of the ampoule, just in case it breaks (only one break in 2 years of injecting 23 times per week)