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It occurs naturally in human plasma and declines sharply with age from around 200 ng/mL at age 20 to roughly 80 ng/mL by age 60
Injectable administration is hypothesized to provide systemic distribution, but human pharmacokinetic data for this route does not exist
Metallic Taste : Some experience a metallic taste in their mouth
(24) As you can see, anyone following a strict vegan diet may struggle to obtain adequate levels of vitamin B12 in their daily diet
The right choice depends heavily on circumstances specific to each person considering treatment
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