I agree on taking the methyl forms too. The only time you have to be concerned with the methyl form of B12 is if your body can't handle a lot of it. Then you need to pay more attention to dosing and maybe alternate with other bio-active forms of B12. They explain all that on the website too.

At some point, I would be sure to add in a good B-complex. You need the other B vitamins as well.