Cool. It's the most well-known concern. The side-effects of deficiency are pretty terrible, including depression and neuropathy. While there were many happy and healthy vegans in my college's dorm many moons ago, there was one vegan guy who was definitely deficient based on mood (severe depression) and appearance.

Glad you're not contributing to (bacterial) antibiotic resistance, (viral) pandemics, climate change, resource inefficiency, air/water/soil pollution, or animal cruelty as much as the rest of us. I'm merely a lazy vegetarian.