I know that I am deficient in B12. I was tested in November and my level at that time was 449 - it later dropped to 329 in January. I am interested in following Freddd's protocol, but my nutritionist has been adamant that I only take the hydroxy form of B12. I haven't always followed his advice in the past, so I don't mind ignoring it this time; however, part of the reason he suggested that is because the last time I took the MB12 I was knocked out flat! I had extreme fatigue for several days after. Why would this have happened? My other concern is that all of the recommended MB and AD12 lozenges seem to have some type of sugar in them - xylitol, mannitol, sorbitol, etc, etc. I am on a very restricted diet and am not supposed to have any sugar. Are there any other options out there? Thanks!