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How much vitamin B 12 is needed on daily bases for different age groups? - Quora
Vitamin B12 and the Vegan Diet - Today's Dietitian Magazine
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Vitamin B12 deficiency: How much you should be getting every day and what to eat for your daily dose - Cambridgeshire Live
How Much Vitamin B12 Should be Taken Daily? | lemmelive
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How to take Vitamin B12 – Botanical online
Why I Add a B12 Supplement To My Vegan Diet — Plant Based Bride
