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I always protect them as much as possible from light (in boxes in a dark cupboard)
Your provider should reassess your B12 levels periodically typically every 3 to 6 months to determine whether continued injections are warranted or whether oral supplementation is sufficient to maintain adequate levels
B12 injections can begin working within hours or a few days
Standard Weekly Protocols Most adults get 1000 mcg (1 mg) of Vitamin B12 weekly
An injection delivers B12 directly into the muscle, so absorption does not depend on your digestive system
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