How long have you been vegan? You still haven't told me how you are getting your B12. Living without a car is not practical in most parts of the US. Uber/Lyft have made it more viable than it once was for people who only drive occasionally, but it's still not very viable for most. The US is a vast country where everything is spread out. We don't have much in the way of public transit. Riding around on a bicycle on a major road in the US is a great way to end up dead. Grass fed butter is butter from cows that graze on grass instead of eating grain. It is extremely rich in fat soluble vitamins. It also tastes different and looks different from regular butter. It contains many things that are deficient in a vegan diet: Vitamin A/Retinol Vitamin D Vitamin K2 CLA Omega 3 fatty acids Butyrate Lecithin Selenium Magnesium Zinc Copper Iodine It's a very healthy fat that is a good alternative to something like olive oil. You're going to want to eat a lot of it when you inevitably get sick and come off the vegan diet.