Acharya Prashant addresses the argument that Vitamin B12 can only be obtained from animal meat. He begins by clarifying that no animal, including humans, produces Vitamin B12 in its body. Instead, Vitamin B12 is produced by a specific bacterium. This bacterium is found in the intestines of many animals, including humans, and is also present in the soil. The reason humans often don't get enough B12, even though the bacteria exist in their intestines, is that it is produced too low in the digestive tract for absorption. Consequently, the B12 produced within the human body is expelled along with waste. In nature, animals obtain Vitamin B12 by consuming grass, fruits, and leaves that have fine particles of soil on them, as they do not wash their food. This soil contains the B12-producing bacteria. However, modern humans face a different situation. Firstly, the extensive use of chemicals and fertilizers in agriculture has often killed these beneficial bacteria in the soil. Secondly, humans have a habit of thoroughly cleaning their food, which removes any remaining soil particles. The food also undergoes numerous mechanical and chemical processes like peeling and spraying before it reaches us, further eliminating any chance of ingesting these bacteria. Therefore, the argument that nature intends for us to kill animals for B12 is flawed. Nature's original system provided B12 through plants and soil, but human interventions have disrupted this cycle. The speaker then points out the hypocrisy in rejecting B12 supplements as "artificial" while readily accepting numerous other artificial products and medical interventions. He questions why people who use factory-made vaccines for diseases like COVID, polio, tetanus, and smallpox, or take various other medications and supplements like calcium and iron, would object to a B12 supplement. He argues that our entire lifestyle, from the clothes we wear to the glasses on our faces, is full of artificial, factory-made items. If one is willing to take a factory-made vaccine to save their own life, they should also be willing to take a B12 supplement to save an animal's life. He concludes by advising that to avoid harming animals, one should take B12 supplements. However, he cautions that one must ensure the supplements are vegan and not derived from animal sources, as some can be. The speaker emphasizes that nature did not intend for us to be non-vegetarian; our own actions have created the current situation. Therefore, taking a vegan B12 supplement is a compassionate and logical choice for those who wish to practice non-violence.