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Yes, it is safe at 1500 mcg per day as you stated, but anything more has an impact on the body, therefore you should only use supplements for a total of 1.5 months
They may experience chemical degradation, conformational changes, or formulation-related instability over time
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How often should you take B12
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Prophylactic training in asymptomatic soccer players with ultrasonographic abnormalities in Achilles and patellar tendons: the Danish Super League Study
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