Can you tell me how i could avoid a b12 deficiency on a vegan diet without supplements?

You can't: I'm sorry. Being a vegan is safe is an only if you're willing to supplement. Otherwise, you're playing a foolish game with your life -- you will end up with brain damage. Like all communities of true believers, the vegans -- who can rightly claim the moral high ground in this era of cruel factory farming -- contain many people who will mislead you. Be smart and don't ruin yourself like others have