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You're starting to feel really sweaty, heavy sweaty and fatigued and getting muscle aches and not sure what's going on, you got to get out of the heat, drink water, and get cool wash on you. that's heat exhaustion. here is what i'm really worried about. if that go on and you can see on the right there, heat stroke, this is heat exhaustion, heavy swa sweating, weakness, cold, pale, fainting. there is something called heat stroke. and here's the key with that. you stop sweating. your skin gets very dry and red and hot. you go to 103, 104 degrees, get very confused. altered mental status, rapid p...

Does. but it does block the vitamin d. david loves copper tone. i love the sound of banana boat. >> i think as far as vitamin d is concerned, all you need is about 15 minutes of exposure without the shirt and you will get about 10,000 units of vitamin d three times a week if you basically are not wearing your shirt and you have that exposure, you will get it. i think a lot of these exposures to uva and uvb, especially at tanning salons, attacks on the skin is what can cause this kind of melmelanoma. so being out there for a few times in the summer, cover yourself in the lotion, you should be f...

Shirt. you still get a beautiful tan and you're okay. tanning lotions are fine. they're fairly safe if you want to get the color but the idea is to be out there and really enjoy and not get burned. >> and dr. samadi made a great point. you put it on sometimes and in the late morning and go out and forget about it all day. you have to reapply these. >> every couple of hours. that's the point about this consumer report study even though i agree it wasn't well done. the point is if you go in the water, if you go in the ocean, you have to reapply it after. >> even not. they kind of wear off, don't...