I've been taking Jarrow methylfolate for quite some time now, and only just now realized that it's not Metafolin (the one patented by Merck), but rather Quatrefolic (patented by Gnosis). In any case both are the (6S)-5-MTH form, with the former being a calcium salt and the latter a glucosamine salt. I suppose both would react equivalently in the body. (I have one of the mthfr snps indicating potential need for m-folate).
But I'm just curious, what brands of methylfolate do people here use? Have you noticed differences between brands?
Also, saw this on the Merck website: "Metafolin® does not mask a vitamin B12-deficiency" -- now THAT is interesting, wish I understood the mechanism! metafolin.com
Fbirder, am especially curious about your feedback.