I never used protein supplements before. My gym gave me a huge container of protein supplements for free. One of the trainer there said that it's good stuff. I just go to the gym to keep in shape. I don't have any aspirations of building huge muscle mass. But since I got it I might as well investigate it. I've been told by an acquaintance that once you build muscle mass using protein supplements, and stop weight lifting, your muscles will degrade to a worse level than if they were built from natural proteins. Is there a grain of truth in this? I couldn't verify this on google. Also, the brand is the gym's name. Is this a red flag? Is there a difference in quality over different brands? Are some brands more respectable? And finally, the nutritional label shows alot of stuff is in 100's of milli-grams. Are there side effects or health concerns for a reasonably healthy adult? Such as screwing up the heart, or whatever later on.