Genetic testing showed that my body cannot convert the various forms of folate found in food and in most supplements to the active form, methy-tetra- hydro-folate, or methyl folate for short, as efficiently as can people without the genetic variants. These variants are not rare. Methyl folate is the form needed by the brain. My doctor recommended taking folate in the MTHF (or methyl folate) form. I prefer this Swanson brand because it contains the patented and tested Quadrefolic TM and is priced well, especially during sales.

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