Vitamins are "vital" substances that the body cannot make itself and need to be added from the outside through diet or supplementation. So if your "being the kind of person who takes vitamins" means that you eat an extremely balanced diet that covers all your macros, then you are good, but most people do not eat enough of the right foods.
In addition, there are tons of substances that your body can synthesize itself, but would love more of it. Creatine for example can be made in the liver and kidney from L-arginine, glycine, and L-methioninein, but it takes work for your body to do it. It is much more efficient (something like 20X) to just take a creatine supplement and bring it to levels that will allow your body to maximize it's production of the energy molecule ATP (by resupplying a phosphate molecule).
> Vitamins are "vital" substances that the body cannot make itself and need to be added from the outside through diet or supplementation. So if your "being the kind of person who takes vitamins" means that you eat an extremely balanced diet that covers all your macros, then you are good, but most people do not eat enough of the right foods.
But we know your first claim is not true, because the body can make Vitamin D by itself. Just because it was called "vitamin" isn't enough to mean anything.
And the second claim is just what the article is disproving!
'the body can make Vitamin D by itself'. Sorry for underlining the obvious but no, it can't. It needs sunlight and the prevalence of rickets (as a result of vit D deficiency) in women who by custom, habitually cover themselves and live in somewhat sun-free England is a demonstration of this.
In addition, there are tons of substances that your body can synthesize itself, but would love more of it. Creatine for example can be made in the liver and kidney from L-arginine, glycine, and L-methioninein, but it takes work for your body to do it. It is much more efficient (something like 20X) to just take a creatine supplement and bring it to levels that will allow your body to maximize it's production of the energy molecule ATP (by resupplying a phosphate molecule).