10 µg B12 Not Enough

On March 6, I posted that in light of new research, I was raising the lower limit of my single-dose B12 supplement recommendations from 10 µg to 25 µg. This was an extrapolation, but I just came across some new research to reinforce this change. A study from India shows that 10 µg of B12 in one single dose per day was not enough to lower homocysteine to ideal levels.

Details here.

Thanks, Tom!

3 Responses to “10 µg B12 Not Enough”

  1. Marjorie Ramos Says:

    A very simple question. I now take 1 1000 mcg sublingual pill a day. I don’t know the ug conversion. Can you help me? Am i taking enough according to the new study or do I need to up it by 2.5 times?

    Thanks. Love your blogs. Read them every day!

  2. Jack Norris RD Says:

    Hi Marjorie,

    µg is the same as mcg. They both stand for microgram. 1,000 mcg per day is more than you need, 2 to 3 times a week would be enough.

    Thanks for the kind comments about my blog!


  3. Pat Says:

    my neurologist said that 1,000 mcg per day is good for me on a vegan diet

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