Make sure you hit the showers after those workouts. And make sure you get at your back with some actual soap
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I've heard a link between acne and lactose (intolerance). Some whey products contain varying amounts of lactose so I wonder if this is a prob for some people. BUT if you don't get that from drinking milk you darn sure aren't going to get it from whey. As far as the protein I've certainly never had a problem and, hell, I AM lactose intolerant. So like TALO said I guess everyone is different. There are also these things called coincidences, though