Hi, harrycat.
Yes, MethylMate B, Metafolin, FolaPro, and Deplin all contain 5L-methyltetrahydrofolate as the active ingredient. There are other products on the market, usually called "5-MTHF" that are half the 5L form and half the inactive 5R form. These two forms are called "enantiomers." They have differing "chirality," which means that their molecules have the same chemical formula, but some of the atoms in the inactive form are arranged in sort of a mirror image of their arrangement in the active form. This is called a "racemic mixture." It is less expensive to produce a racemic mixture than the pure active form. This is also true of folinic acid. There is now a folinic acid product that contains only the active form, but the commonly sold folinic acid is a racemic mixture. This is the same situation as in alpha lipoic acid. There is now R-lipoic acid, which contains only the active form, but costs more.
Sorry about the problem with the drops. I switched to drops in the most recent revision of the protocol, because I thought it would be more convenient than having to split tablets. Also, Amy Yasko's site claims that the drops are less expensive than FolaPro, but I understand that Metafolin is cheaper than FolaPro, too. I think that any of the 5L products should be fine. All except the MethylMate B are made by Merck. The 5L-methylTHF in MethylMate B is made by Gnosis.
Hydroxocobalamin is fairly stable, chemically. Methylcobalamin is the form that is very sensitive to light, and can break down to form hydroxocobalamin.
Best regards,
Rich
