Bioavailability is a measure of the ability of a drug or other substance to be absorbed and used by the body.

JECFA concluded that the bioavailability of folate from 5MTHF-Ca was similar to the bioavailability of folate from folic acid in man and that synthetic 5MTHF-Ca had the same metabolic fate as other absorbed natural folates (JECFA, 2006) 

Do different methylfolates have the same bioavailability?

From a full article published by EFSA, we can also learn that "No significant differences in the plasma levels of folate between participants given 5MTHF glucosamine and those given 5MTHF-Ca were observed (Technical dossier, 2012)" 

If you are interested, please click here to check the details. https://efsa.onlinelibrary.wiley.com/doi/pdf/10.2903/j.efsa.2013.3358

Magnafolate® ,the Manufacturers & Supplier of active folate.