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In certain regions of the world, marginal or subclinical vitamin B 12 deficiency may be fairly common in other age groups as well, including children, premenopausal women, and pregnant women, primarily due to low intake of animal-source foods (reviewed in 5)
Athletes, gym users and people with chronic musculoskeletal complaints make up the largest group
It does not provide injection technique guidance or dosing advice
Dagley, M
Life (2009)
However, the conservative approach is waiting until skeletal maturity and the early 20s when growth plates are fully closed and endocrine systems are mature
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