And in addition to all of that, palpitations and/or racing of the heart for no apparent reason, and an endless list of things, can be due to low B12. And I can vouch personally for the fact that some of us experience exacerbations of those things after beginning treatment, not only within days or weeks after beginning treatment, but periodically throughout months or years as the body repairs. In my case, the heart irregularities became worse at times during the first months of treatment before disappearing.

So, it may not be possible to separate it all out. But of course it is important to be alert to possibilities that require attention.

rose