Hi, I'm sure one of our knowledgable B-12 experts will hop on board and give you lots of good info.

I can only tell you what I take. I take 5000 sublingually every day. My last level was 2000 and I gather it's much higher now. With absolutely no ill effects. My husband's level is over 3000. He has neuropathy. The Methyl B-12 helped MY neuropathy because I'm diabetic. It didn't do a thing for my husband, unfortunately.

I do not take cyano.I take straight Methyl B-12.

On an empty stomach. First thing when I wake up in the a.m.

Listen to the others who come here and then you can decide for yourself.

Melody