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Protein powder is a dietary supplement that is made from one or more of four basic sources of protein: whey, eggs, soy and rice. These concentrated sources of protein are processed into powdered form, which can be reconstituted into liquid form as a protein shake when mixed with water, fruit juice or milk.
That refreshing protein powder shake may be causing your acne. Photo Credit HandmadePictures/iStock/Getty Images. Whey protein powder is an effective supplement for bodybuilding: One serving of whey protein can provide you with over 30 grams of protein for muscle growth and repair. But some studies have linked whey protein supplementation to acne breakouts.