You don't have to buy Vitamin D for depression - just go out and lay in the sun for 30 minutes every day when the sun is strong. Which is what my old doctor used to recommend to me - downside is that it makes your skin look old. I do the health protocol - figure $8 per month for a 30 packet box of E'mergency Vitamin C which I have taken for years plus another $6 for the Walmart Vitamin D and K combo is cheap health insurance plus some daily Fish oil for the heart - you can get that by eating salmon or a can of sardines in olive oil or fish oil every day. I imagine that the typical herd of Americans who only read one book a year have no clue about their health - they are waiting for their diabetes or heart attack without knowing it - which is why they do not supplement with vitamins. I haven't gone to the hospital for serious health problems for years - but I take vitamins and eat real food - not fried foods like hamburgers, fries etc to guard my health plus try to walk a mile every day. If you always feel sick and are fat, I'm guessing you will also feel depressed, so work on your health! Quick tip: If you have ED, start taking Vitamin K and Nattokinase Serrapeptase to clean out your arteries and thin your blood - you likely have not just ED but coronary heart disease. Watch some Youtube videos on these supplements to get up to speed.