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Solved C. The recommended dietary allowance of vitamin B12 | Chegg.com
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Nutrients | Free Full-Text | Comparative Bioavailability of Synthetic B12 and Dietary Vitamin B12 Present in Cow and Buffalo Milk: A Prospective Study in Lactovegetarian Indians | HTML
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Everything you need to know about vitamin B12 - Simple Vegan Blog
B12 is safe.
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