When should monthly 1000mcg IM vitamin B12 maintenance doses start after initial 2 week loading in elderly patients with vitamin B12 deficiency? Can 1000 micrograms (mcg) of vitamin B 12 (cyanocobalamin) injections be administered twice a week? Should You Take Natural vs. Synthetic B12? How often should I take 1,000 mcg B 12 supplements?
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