I use one from Trader Joe's. They're pretty good about pointing out which ones are animal free.
I bought some from Whole Foods (the chain) and they were approved by Veganguard or something. Says it's completely Vegan and free of animal products. I'll post the name when I get home. I take the prenatal ones b/c I'm told they somehow help make your hair grow faster *shrug* No idea if it's true or not but I felt like being rebellous about 6 months ago and shaved my head >_< So yea after a lot of crying and mourning I am slowly growing it back and will do whatever I can to help it!