Hello Jingle...

The reason methylcobalamin is being recommended now, is that genetics
research is showing that people often do not convert cyanocobalamin effectively to get full benefit. Cyano is a synthetic man-made version, it is the most commonly known for many years, and requires 4 steps in the body so that
the body can use it.

The trend today is that using the methyl (which is very inexpensive now...9 cents a day) is the most guaranteed oral way to go. In fact the new RX version Metanx has the new methyl in it, and we will see this take over from the cyano.

Now dose wise... when B12 is used orally this way very little is absorbed.
It is thought that about 10 micrograms out of the 1000mcg in a tablet are successfully passively absorbed in the small intestine. The rest is lost.

Since no physical toxicity has ever been seen with high dose B12, the concern for doses is not a real factor for worry. Taking too little is more of a worry in fact!