Just a couple of clams or oysters per day offers you all the B12 you need. Ingesting these creatures regularly will make for a good vegetarian diet to forestall B12 deficiency. If you can’t bring oneself to try to eat bivalves (as is the case with spiritual Jewish people today, https://bookmarkinglive.com/story14260304/the-b12-supplementation-for-vegans-diaries