As far as I know there are not many drawbacks in Whey protein supplements. Whey proteins are ideal for body builders and those who are looking to improve their body mass. Whey proteins are good as long as you work out regularly. Remember that if you use whey protein you must make sure that you exercise everyday and do a lot of cardio. Whey proteins do not contain any fat or cholesterol and they are available in several different flavors as well. You can ask around and check if anyone has experience any drawbacks till now. Hope that helps clear your doubt.