Protein powders have become increasingly popular as a convenient way to support fitness goals and maintain a healthy lifestyle. Widely used by athletes, bodybuilders, and health enthusiasts, they are praised for their ability to boost protein intake and aid muscle recovery. But with all the hype, it’s worth asking—are there any risks or downsides to using them long-term?
Let’s start with a recent report from the Clean Label Project, which has raised some serious concerns about what might be lurking in these health-focused products. Released this year on January 9th, the study found many protein powders contain high levels of heavy metals, including lead and cadmium. And here’s the scary part: these contaminants aren’t listed on the labels. Lead and cadmium are both toxic and can cause serious health problems. Lead, for instance, has no safe exposure level according to the U.S. Environmental Protection Agency. Meanwhile, the Occupational Safety and Health Administration warns cadmium can damage your kidneys, bones, and lungs, and even increase your risk of cancer. Definitely not what you want in your protein shake.
Things would not be complete without a debate, and the Council for Responsible Nutrition is pushing back on the new report about supplement contamination. They argue the report falls short on clarifying contamination thresholds and how products were selected. They also highlight that modern testing can detect even trace amounts of heavy metals, which occur naturally in soil, air, and water. According to them, these levels often fall well below the safety standards set by the Food and Drug Administration and the Environmental Protection Agency.
However, the conversation doesn’t end there. Protein powders have plenty of fans who swear by their benefits—boosting muscle mass, improving athletic performance, and offering a quick, convenient source of nutrition. Still, there are legitimate concerns, as many powders come loaded with extra ingredients like sugar, artificial flavors, thickeners, and added vitamins or minerals, which might not be everyone’s cup of tea.
Kathy McManus, director of nutrition at Harvard-affiliated Brigham and Women’s Hospital, highlights some important things to know about protein powder. Since it’s a supplement, the Food and Drug Administration doesn’t regulate it, so there’s no guarantee it contains exactly what’s on the label. Plus, there’s not a lot of research on the long-term effects of getting so much protein from supplements.
For some people, especially those who are lactose intolerant, milk-based protein powders can cause stomach issues. And watch out—some powders are packed with sugar, often exceeding the daily recommended limits, which can contribute to weight gain and cause blood sugar spikes. McManus also explains chemical-free protein powders can sometimes be useful, but only under medical supervision. This might apply to cases like difficulty eating due to cancer treatment or age-related frailty, slow-healing wounds that need protein for cell repair, or serious conditions like burns requiring extra calories and protein for recovery.
For everyone else, whole foods are the way to go. Nuts, seeds, low-fat dairy, beans, fish, poultry, eggs, and lean meat offer plenty of protein without the need for powders. Maltodextrin is a highly processed carbohydrate known for spiking blood sugar levels and increasing gut inflammation. It’s also important to note protein powders are not a magic fix for fitness goals. They work best alongside a balanced diet and regular exercise. Supplements shouldn’t replace whole food protein sources, which offer additional nutrients and benefits. If you feel like you need additional protein, choose a high-quality powder from a reputable brand, ideally one that’s third-party tested for safety and ingredient accuracy.
