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Concentrations naturally decline with age (from about 200 ng/mL at age 20 to 80 ng/mL by age 60), which is part of why supplementation makes sense
What Are the Active Ingredients in Each Form
The choice of treatment should be individualised, considering the underlying cause, symptom severity, patient preference, and practical factors such as access to healthcare facilities for regular injections
Neurobiol Dis 2008
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