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Primary care is the right next step when fatigue, numbness, dizziness, or medication-related questions need broader evaluation
The speed at which B12 treats nerve symptoms shows differences between patients
Commercial research material is therefore commonly supplied with an oppositely charged counterion, such as iodide, to form an electrically neutral salt
age-related plasma decline (roughly 200 ng/mL at age 20 to about 80 ng/mL by 60): Pickart L, Margolina A
For a confirmed deficiency, their guidelines point to a specific type of B12 called hydroxocobalamin, given as an intramuscular injection
PMC 6581107
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