B12 Recommendations for All Ages

Two people have recently asked me for B12 recommendations for children, so I created a table in which I extrapolated the adult recommendations to children.


You’ll notice a range in the table for both one and two doses per day; anywhere within that range will be a good amount to take to maximize B12 status. Note that the RDA is to prevent overt B12 deficiency, not to minimize homocysteine levels. My recommendations are intended to be enough B12 to minimize homocysteine.

3 Responses to “B12 Recommendations for All Ages”

  1. Lisa A. Says:

    Thank you for the table. That is really useful. I noticed that you increased the frequency for taking 1,000 mcg tablets of vitamin B12. Before, it was twice a week, now it is three times. Is there a reason for that?

  2. Jack Norris RD Says:


    It should have been 2 doses per week and I’ve corrected it. I either got confused or made a typo. Sorry. But here is how I calculated it a few months ago:


    It is not an exact science, at this point, I’m afraid.

  3. Nikki Qureshi Says:

    Thank you so much, this is so useful! Finding good advice for vegan children is so much harder than it is for adults.

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