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Physically, you might feel weak, dizzy, or notice a strange tingling or numbness in your hands and feet
Effects of vitamin B-12 supplementation on neurologic and cognitive function in older people: a randomized controlled trial
Patients should avoid online vendors selling them as research chemicals those products are not tested for human use and have been found in independent testing to vary dramatically in purity and concentration
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Zuri Hemphill-Bryant, an Atlanta-based OB-GYN, tells Romper via email
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