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Spirulina is a type of algae and when it is dried the previously useful b12 may turn into an analogue form. To really test if it is working for someone the ideal would be to first test b12 levels and methylomalonic acid, then supplement for a few months, and the test both of them again. If you are only testing for b12 you may have false highs from analogue forms that the body does not use.

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