They have found that vitamin B-12 has different analogues and not all of them work. Also a group of vegans tried to get it from plant sources but tests showed that they did not get enough. B-12 supplements are different than other vitamin supplements since they are grown.
It is the cheapest supplement since you need so little. Some people buy 500 mg tablets of vitamin C and take it every day. 500 mg of vitamin B-12 is enough to last you 100 years!
The RDA of vitamin C is 60 milligrams. The RDA of vitamin B-12 is 6 one-thousands of a milligram. Or 6/1000 milligrams. Or in other words 6 micrograms. It is so little, you might as well take a supplement of it. There used to be more B-12 in foods when the foods were not so clean. |