where do vegan multivitamins ..?

Question

get the b12?
http://www.vegsoc.org/info/b12.html
it says here that vegans should take vegan supplements, as scientists arent sure if b12 can come from a plant source.
Well then where do they get b12 for the vitamin? do they synthesize it? how?
I know vegans are healthy, im just curious where the supplements get their b12

huh? how do they harness that into a multivitamin?

Answer 1

Reliable Vegan Sources of Vitamin B12
A number of reliable vegan food sources for vitamin B12 are known. One brand of nutritional yeast, Red Star T-6635+, has been tested and shown to contain active vitamin B12. This brand of yeast is often labeled as Vegetarian Support Formula with or without T-6635+ in parentheses following this new name. It is a reliable source of vitamin B12. Nutritional yeast, Saccharomyces cerevisiae, is a food yeast, grown on a molasses solution, which comes as yellow flakes or powder. It has a cheesy taste. Nutritional yeast is different from brewer’s yeast or torula yeast. those sensitive to other yeasts can often use it.

The RDA for adults for vitamin B12 is 2.4 micrograms daily (1). About 2 rounded teaspoons of large flake Vegetarian Support Formula (Red Star T-6635+) nutritional yeast provides the recommended amount of vitamin B12 for adults (2). A number of the recipes in this book contain nutritional yeast.

Another source of vitamin B12 is fortified cereal. For example, Nature’s Path Optimum Power cereal does contain vitamin B12 at this time and about a half cup of this cereal will provide 2.4 micrograms of vitamin B12 (3). We recommend checking the label of your favorite cereal since manufacturers have been known to stop including vitamin B12.

Other sources of vitamin B12 are vitamin B12 fortified soy milk, vitamin B12 fortified meat analogues (food made from wheat gluten or soybeans to resemble meat, poultry, or fish), and vitamin B12 supplements. There are vitamin supplements that do not contain animal products.

Vegans who choose to use a vitamin B12 supplement, either as a single supplement or in a multivitamin should use supplements regularly. Even though a supplement may contain many times the recommended level of vitamin B12, when vitamin B12 intake is high, not as much appears to be absorbed. This means in order to meet your needs, you should take a daily vitamin B12 supplement of 5-10 micrograms or a weekly vitamin B12 supplement of 2000 micrograms (4).

We store between 2 and 5 micrograms of vitamin B12 and only excrete a very small fraction of this each day. Nevertheless, over time, vitamin B12 deficiency can develop if stores are not replenished with vitamin B12 from the diet or from supplements. Although bacteria in the large intestine of humans do produce vitamin B12, this vitamin B12 does not appear to be absorbed (5) and is not adequate to prevent a vitamin B12 deficiency (6). Although some vegans may get vitamin B12 from inadequate hand washing, this is not a reliable vitamin B12 source.

Tempeh, miso, sea vegetables, and other plant foods are sometimes reported to contain vitamin B12. These products, however, are not reliable sources of the vitamin. The standard method for measuring vitamin B12 in foods measures both active and inactive forms of vitamin B12. The inactive form (also called analogues) actually interferes with normal vitamin B12 absorption and metabolism (7). When only active vitamin B12 is measured, plant foods including fermented soyfoods and sea vegetables do not contain significant amounts of active vitamin B12 (8).

Very small amounts of vitamin B12 have been found in plants grown in soil treated with manure (9). It is not clear whether this vitamin B12 is the active form or the inactive analogue. In any case, the amounts are so small that more than 23 cups of organically grown spinach would have to be eaten every day in order to meet the adult RDA for vitamin B12 (9,10).

Answer 2

Bacteria make the B12. The same kind of bacteria that lives in the guts of animals and makes THEIR B12.

Answer 3

the only mineral/nutrition that a vegan can not get is nutrition B12 you may get calicum,iron and so on from all non animal product materials so in case you have been able to get a nutrition that had the two calicum and B12 in it....that must be super for you!