From Cleveland Clinic's Health Essentials Series: "Add protein powder to your smoothie every morning? Be sure to read the ingredients first. 'All protein powders are not created equal,' cautions Zumpano.The protein base can be whey, casein, beef, collagen, hemp, pea, egg or rice. 'But some protein powders are also loaded with added sugar, artificial sweeteners and preservatives,' she continues."
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