There is no such thing as “most important molecule in life” (because life requires an enormous complexity), but if there were, I would choose ATP for the title. This is life’s energy currency, the universal energy storage unit, used in practically every synthetic reaction that happens not just in our bodies but in all animals, plants and bacteria (and even in viruses when they are directing traffic in the host). I am including ATP in our perfect line of actives NOT because it will solve all your problems, it will not. First of all, ATP is being formed and broken continuously, so any energy stored in the gram of ATP we can sell you will be used up almost instantly. But the ADP and phosphate formed as a result will be used and reused by your body, so there is no waste here.
Go to our newsletter from November 2008 for more information on ATP and how the mitochondria makes it.
http://www.skinactives.com/forum.aspx?fid=15025255
ATP: in Shiseido Bio-Performance Advanced Super Revitalizer Cream $90 for 1.7 oz