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The sole use of methylcobalamin is however criticised for being a one-sided provision, which is why today it is combined with other natural forms
Long-term data beyond 12 weeks in humans does not exist from controlled trials
They are not FDA-approved
Others who may not be able to tolerate dosages of vitamin B12 that are higher than what is found in most multivitamins include people who have been diagnosed with low potassium, Leber's vision loss, or atrophic gastritis, according to WebMD
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