Hello dear, Protein supplement is a nice thing to go for during workout. Protein is found in meat, eggs, soy, pulses etc, the amount of protein required daily is 1gm per kg of body weight and for a good growth of muscle we require 2gm per kg body weight which includes all the protein from your food or supplements. Protein supplements in market are mainly of whey and soy of which whey protein is the best. Protein alone is not enough for workouts, we do require minerals and vitamins additionally for proper utilization of protein you have taken. Intake of protein has got no side effects unless its not absorbed well for which you may have flatulence. There is no over dosage issue with these supplements and can be used any number of days. Whey protein in fact has many other advantages like it decreases cholesterol, anti carcinogenic, helps decrease hair-fall, keeps skin healthy, etc.. You can continue with your protein supplement and is very much safe. Hope this helps.