For practitioners the supply chain runs through a registered pharmacy against a valid prescription
Requirements of vitamin B 12 in excess of normal (due to pregnancy, thyrotoxicosis, hemolytic anemia, hemorrhage, malignancy, hepatic and renal disease) can usually be met with oral supplementation
Some patients need these injections almost daily, while others will be prescribed the injections once every three months or so, and others may only need a top-up once a year, this all depends on your progress, where you are within your weight loss journey, and how much you are looking to lose
translation to another tissue, species, or route of exposure