> Nutritional yeast is tasty and naturally has b12, and most cereals/grains are fortified with it.
Taurine, Carnosine, Creatine, and B12 don't exist in significant quantities outside of meat. Nutritional yeast is often supplemented with B12 but the bioavailability of it compared to animal protein is low. You will need to take an actual supplement to get the right amount of B12 your body needs to function optimally.
You'll also probably need to supplement calcium, iron (with kelp-based supplement), omega-3 fatty acids (with algae-based supplement), and Vitamin D because even though many of these are found in plants and even relatively high amounts, their bioavailability is low. Spinach is rich in iron but very little of it can actually be processed by the body.
> This just isn't true, you can get all amino acids from plant-based sources like soybeans, lentils, and peanuts.
The amino acid profile in plant sources do not mirror the needs of human beings. In order to achieve a complete amino acid profile you will need a combination of many protein sources like pea, hemp, soy, brown rice, and quinoa. In order to actually consume it and get what you need you'll likely need to make a mixture of protein powders because you won't consume the right amount just eating plant foods.
