In short: While B12 shots are FDA-approved for treating serious conditions such as anemia and malabsorption, they are also used in wellness settings to help people with subclinical deficiencies feel more focused and energized
But a huge number of meat eaters are also deficient and likely dont know it B12 is absorbed through the stomach, and our ability to assimilate it through the stomach wall decreases with age, as well as due to any stomach issues like IBS, Crohns, and Celiac Disease, and medications that impact the stomach like metformin, antacids, PPIs, and ibuprofen
These are frequently used in wellness and weight management settings
But even without that level of customization, understanding the core dosing principles will put you ahead of most researchers fumbling through contradictory information online
B12 shots are usually safe