ok I don't know much about vits,but was told to take b12 because I don't eat animals.Why?

Because B12 is a bacteria only found in animal products, and B12 deficiencies are a serious problem for veg*ns who don't eat fortified foods or take B12 pills.

For more information read: "What every vegan should know about B12" at http://www.veganhealth.org/articles/everyvegan/
or more detailed info at http://www.veganhealth.org/b12

Those will explain why, the risks, and also what type of B12 pills work best.

B-12 is a micro nutient, in other words, you need just a tiny bit of it.

Here is a B-12 post that would be of interest:
http://www.veggieboards.com/boards/showthread.php?t=51354&highlight=B12