I respect your right to disagree, however if one uses a raw living foods based lifestyle and has food grown properly (in soil with micro-organisms and a wide array of minerals(the critical missing component in most raw food diets), then you will not have any issues. The trouble is agrifarming has depleted most soil (even that which many organic farms attempt to grow produce in), so people have nutritionally deplete diets. By educating oneself beyond these pitfalls, you can easily supply all the nutrition you need from your food. Even just growing your own sprouts and grasses will take you far, far beyond even organic produce. Most sprouts are between 10 to 30 times more nutritionally dense than the best organic vegetables for instance. Also by utilizing algae and ocean vegetables such as dulse you will go very far beyond any supplementation.
Another important issue here is that most supplements are unnatural and actually stress the liver. They also require extra energy to attempt to break down and remove from the system. They are not recognized by the human system and are treated as an invader. Most supplements cause an immune response as does most cooked food (scientifically documented). Most do not break down and end up in the septic system anyway.
If one thinks they need supplementation while rebuilding an unhealthy system (where there is poor absorption and organ function) then the optimal way to do this is from food based supplements such as green food blends. One must do there homework in this regard because there is a wide range in quality even in green food supplements.
This opinion is based on many years of both personal experience backed up with lots of research. In the end we must all decide what is right and true for ourselves.
What you are suggesting in your statements would mean nature screwed up. I personally believe that just as most animals in their natural habitat are healthy (especially compared to their domesticated counterparts) humans have this same capacity if they also utilize their ideal environment along with ideal nutrition.
6 years raw and my niacin levels, b12 levels etc are optimal. B12 can be synthesized in a healthy gut. North American lifestyles destroy this innate ability and it takes time and knowledge to rebuild function. Cultured vegetables and SBO's will do the necessary rebuilding.