I think I'm low in my B12 again, and I don't think that the vitamins are working,

If you are not sure then maybe you need to get tested again to verify if you still are deficient.

Methylcobalamin is far superior and is more easily absorbed. By the same token folate is the superior natural form of folic acid. Unfortunately most multivites contain B12 as cyanocobalamin and vitamin B9 as folic acid instead of folate.

www.methylcobalamininfo.com/methylcobalamin-vs-cyanocobalamin/

In fact, cyanocobalamin isn’t something nature ever intended your body to deal with – it exists only as a chemical synthesized in laboratories and doesn’t occur naturally in any living organism. Your body actually has no use for the cyano- compound itself, and will set about converting any cyanocobalamin you take into methylcobalamin as soon as possible, as the methyl- compound is what the human body needs to function properly.

This doesn’t only mean that cyanocobalamin is a less efficient way to supplement your vitamin B12 intake – you also face the problem of what happens to the cyanide group that is liberated during conversion into the ‘active’ (useful) form of B12 i.e. methylcobalamin. Cyanide is of course famous for being a poison, so your body needs to remove this unwanted substance. It should be noted that the amounts of cyanide released in the conversion process aren’t thought to be large enough to actually cause any damage (and some common foods will also introduce small amounts of cyanide into your system).

If you haven't already done it, run a 23andme panel on your saliva. Once the analysis is done, download raw data and feed it to GeneticGenie. It will tell you your MTHFR status and other methyl cycle SNPs. Having MTHFR SNPs and other SNPs in methyl cycle demands you get methyl donors, which is exactly what methylcobalamin is.

Cyanocobalamin to get absorbed in the body to actually usable form, it goes through various steps. Hydoxycobalamin is the form that mostly body uses but if you need a methyl donor you need to take something that will provide methyl donors to your body's chemical reactions. Taking methyl/cyano or hydroxy form without knowing MTHFR status is, bluntly, foolish.

Second thing is, we IBDers tend to absorb B12 less. Taking methylB12 you go a couple steps ahead in B12 processing for the body to use it. This is the reason why I take methylB12, and 5-MTHF form of folate.