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These approaches aren't competing with each other

The standard dosing range in clinical use is 250500 mcg per day, administered in the morning on an empty stomach for best results, though some providers prescribe alternate protocols

According to Harvard Health Publishing the following are symptoms that might suggest a vitamin B12 deficiency: Tingling, numbness, or abnormal sensations in areas such as the legs, hands, or feet

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To keep yourself safe from any adverse effects, take your B12 supplement in the morning or early afternoon to prevent any potential disruption to sleep