Some possible reasons for iron deficiency anemia are malnourishment, repeated blood donation, digestive conditions like Crohns disease, endurance training involving heavy lifting or body training, gut removal using surgical treatment
Most people get at least one of these wrong
"Structures of the N-terminal modules imply large domain motions during catalysis by methionine synthase"
If needles aren't your thing, B12 supplements are also available in capsule, tablet, and liquid forms, which can often be purchased over-the-counter (via Medical News Today)
People with hypothyroidism: B12 supplementation can support thyroid function
These shots are usually given to people with B12 deficiency