This is true, as a nutrition lover I have read a lot of studies and papers about the useless consumption of supplements if the person is healthy, it's just a waste of money and sometimes a risk. We humans can find the right amount of any nutrient by eating normal food, a balance diet is key to be healthy. The only reason that you could consume supplements or almost non edible things like eggshells, is when you have a severe lack of nutrients, which very rarely happens. On the other hand, I would support the fact that people that live in extreme poverty look for alternatives like this one. It's the first that I'm reading your blog, it looks very interesting since I like science and write about it too :D without a shadow of a doubt I will follow you! Greetings ;)