[timewarrior]

Yep, they are and also the best form. Extremely unstable in capsules and oral supplements though.

Methylcobalamin isn't very effective orally. However someone with a gene mutation doesn't have any choices.

[AstralStorm]

It actually is quite effective, much like cyanocobalamin. (The usual form in supplements.) Needs just slightly higher dosage than hydroxocobalamin.