Red clover tops apparently contains B12, according to various sources.

I've earlier posted references to information discussing that "Bacteria on root nodules of legumes (beans, alfalfa, clover) require cobalt (and other trace elements) to synthesize B12 and fix nitrogen from air", and B12 is built around a cobalt molecule. Some literature suggests that the only way for a plant to absorb cobalt is by absorbing B12 - while others seem to disagree.

If B12 is found in red clover tops contain B12, the nodules of these plants may contain even more B12. According to this site, "appreciable (though not actually stated) amounts of the vitamin were present in nodules of lucerne, clover and pea". The always returning question whenever B12 levels - in plants, animal products and supplements) are discussed, is: Does the B12 in question have any effect? There has been an ongoing controversery about the importance of B12 and heart disease/homocysteine for years, but nobody seems to disagree that long term, very low levels of B12 can cause neurological damage.

Of course one cannot experiment with this, by exposing some people to very low B12 levels over a long period of time, and see if they end up with neurological damage. So, a question which is very important when trying to look at the real life effects of B12 levels in plants/meat/egg/pills etc. is: has any link been observed between intake of these 'products' and neurological damage? In the case of red clover, an assoication between red clover and blocking neurologocal damage (from MSG) has actually been documented, but so far, this doesn't seem to have anything to do with it's B12 levels.

According to a post in this discussion, "Red clover flower, not the roots or stems, is a great herb for any type of cancer. It contains biotin, choline, copper, coumarins, glycosides, inositol, magnesium, manganesel, and selenium as well as vitamins: A, B1, B3, B5, B6, B9, B12, B17, C, P and the mineral Zinc." ("Vitamin P" = flavinoids (bioflavinoids, "B17" is laetrile). Sources for this info isn't posted.