We already know vitamin supplements work. When people present with vitamin deficiencies, they are prescribed supplements, and the deficiency symptoms go away. T

We already know vitamin supplements work. When people present with vitamin deficiencies, they are prescribed supplements, and the deficiency symptoms go away. The anti-supplement agenda is trivially undermined by well-known facts. So now we're just talking about dose, symptoms, and lifestyle. Whether it's an orange or a supplement, the vitamin C still works. Some studies indicate that a fairly high proportion of the population has "sub-clinical" vitamin deficiency, e.g., in C. I used to get nosebleeds pretty often. I have a diet that's very low in fruits and vegetables. When I started taking C, my nosebleeds went away immediately. I'd rather take the supplement than incorporate fruits and vegetables into my diet.