There may be some people who fall within the normal range but need a little more B12, but I reject the idea that they need a lot more. Dr Ayan Panja, a GP in St Albans with an interest in preventive medicine, disagrees
The IOM then doubled the amount because only about 50% of dietary B12 is absorbed, and arrived at an estimated average requirement (EAR) of 2.0 g
Vegans, vegetarians, people over the age 50, anyone with stomach/bowel issues like chronic gastritis, leaky gut, IBS or celiac, and anyone who regularly takes medications such as Metformin, PPIs (used for GERD), H2 Receptor Antagonists (used for peptic ulcers), or anything that interferes with stomach acid production are actually at risk for vitamin B12 deficiency, and should supplement B12 regularly
Homocysteine, methylmalonic acid, and/or holotranscobalamin levels as well as a CBC may also be repeated
Choosing the Right Vitamin B12 Injection Not all Vitamin B12 injections are created equal
Maybe thats true if you get a good energy boost from it, but simply taking a B12 shot will not be your magical bullet to a tiny waist
