and this bio d supreme spray allows people to get that kind of dosing every day and it's bioavailable, it's fast-acting and because it's so convenient for patients, they're going to not miss their regular dosing. and this is critical for people to get the optimal benefit from taking the vitamin d. i love it. >> kris, those are some really impressive results. >> yeah, that's exciting. so you've been talking about vitamin d and you've written a breakthrough book entitled vitamin d deficiency: a growing epidemic. >> well, what i set out to do in the book is to tell the complete story around vitamin d and the human body, all taken from the latest medical research with information that even many medical doctors may still not know. >> just sitting with you here today, there's so many myths about vitamin d that you've dispelled. >> vitamin d is metabolically in a class by itself. it regulates cells and systems throughout our body to help keep us healthy. >> right. the way i explain vitamin d to my patients is what i call the master key analogy. we all have specific genes that are involved in

i like good quality sources of protein, because it's bioavailable, easier to digest. >> like what? of added artificial sweeteners, so that's good for a quick recovery. the g-series from gatorade which has added protein, and a good classic whey protein. it's complete, with a full spectrum of amino acids, critical for good health and the building blks for building muscles. >> people with elimination diets, is that a good trend or bad trend? >> i think listening to your body. if you sense that something doesn't feel like, take a gluen or dairy, or something specific out of your diet, and then feeling if it made a difference in how you feel after the meal, checking in with yourself after of eat something is a great way to know. don't go cold turkey all the way. once again you may not be getting the nutrition you need. >> we have a few seconds left. the juices, another good smart trend? >> yes, smart trend, good healthy food. >> david jack, thanks so much. >> thank you. >> good to see you. >> great to see you guys. >>> more "fox & friends" in two minutes. this is why i don't run. ♪ my i