Answers...

Congrats on the win MJ, though it was by a technicality...  The correct answers are

Vitamin D3- As I have talked about ad nauseum D3 reduces incidence of cancers, heart disease, diabetes and increases lean muscle mass promoting fat loss.  It is a steroid hormone after all!

Vitamin K2 (M4 specifically)-  K2 helps keep calcium in the bones where it belongs, reducing fracture risk and keeping calcium deposits from forming in the vessels and heart valves.  I expect K2 will be attributed to decreased risk for other chronic diseases such as cancer in the years to come, as the ability to test blood levels is somewhat novel.

Omega 3 fatty acids- this one is kind of obvious by now (heart health, depression, etc.).  Just make sure to get is from a reputable company as some big drug stores are currently being sued because many of the fish oil (or was is snake oil..) brands they carried were contaminated with outrageous levels of heavy metals, flame retardants and other nastiness.

Probiotics (with FOS)- Last but not least!  Another product to make sure and get a solid brand if you want them to actually make in into your gut.  It's worth is if they do as they can promote fat loss, prevent flu and colds (probably better than the flu shot) and reduce inflammation.  Some recent studies have shown that Bifidis Infantis, the bug that colonizes the GI systems of exclusively breast-fed infants, can decrease some of the cells that cause inflammation MS!  Also interesting- a study showed that mother taking probiotics during their pregnancy lost their pregnancy weight faster and their children had lower risk of diabetes.

In conclusion, as I said earlier if everyone without specific contraindications were on these imagine the implications on chronic disease in the US.  These would be the absolute best steps to better community health!  Tell your friends and family, they'll thank you later!

Congrats MJ on the win, I gave you credit for your answer because the multi would likely contain vitamin K...
Email me your address and I'll send you your ten bucks!  MJ's record: 1-0-0!