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I thought the injection was typically hydroxocobalamin. Has this changed?

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.

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