These threads really bring the schizos out of the woodwork. There's the adamantly against vitamin crows, who think people who take vitamins are all fat retards who only do so because they don't want to have to eat better. Then there's the "vitamins only come from fruits and vegetables" crowd. Then there's the "meat and fat is full of vitamins and nutrients, you should be eating elk liver instead of plants". Then there's the vitamin enthusiasts who have all kinds of weird bro science regimens and warnings. Then there's the "vitamins are poison and will kill you" crowd. Then there's the uninitiated who wander in the thread and read a bunch of conflicting accounts and leave confused.
I eat a wide variety of animal products, whole grains, nuts, seeds, fruits and vegetables, live in a subtropical sunny area and have taken a multivitamin for decades. My blood work still showed a vitamin D deficiency.
Vitamins are a good hedge bet, but not a cure-all.