If you’ve ever stood in the supplement aisle staring at rows of protein powders, you’re not alone. With dozens of options promising everything from “clean ingredients” to “premium quality,” it can be hard to know which ones actually live up to those claims.
But recent findings are prompting more consumers to take a closer look at what’s actually in their scoop.
In late 2025, an investigation into popular protein powders found that more than two-thirds contained detectable levels of lead. In some cases, a single serving exceeded what experts consider safe to consume in a full day. The study looked at a range of products, including powders and ready-to-drink shakes, across multiple retailers.
The findings don’t apply equally to every product. But they do highlight a key issue for consumers: without clear standards across the category, it can be difficult to know which products meet higher levels of safety and quality.
Start With the Ingredient List
One of the simplest ways to evaluate a protein powder is to read the ingredient label carefully.
Ideally, you should recognize most, if not all, of the ingredients listed. Protein powders can vary widely, from straightforward formulas with just a handful of components to more complex blends that include flavoring agents, stabilizers, and additives.
Fewer ingredients can sometimes make a product easier to understand, but it’s not just about the number — it’s about clarity. If you can’t tell what an ingredient is or why it’s there, it may be worth looking into it.
Also pay attention to added sugars or sweeteners, which can significantly change the nutritional profile of a product.
Check for Third-Party Testing
As protein powder has grown into a multibillion-dollar industry, independent testing has become a critical tool for evaluating product quality.
One organization at the forefront of this effort is The Clean Label Project, a nonprofit that focuses on transparency in consumer goods. Rather than relying on brand claims or marketing language, the organization uses data-driven testing to analyze what’s actually in products.
Its work spans a wide range of categories, from coffee and baby food to nutrition bars and supplements. Protein powder, in particular, has become a key focus.
According to The Clean Label Project, protein powder generated roughly $9 billion in the U.S. in 2023 alone. People use it for a variety of reasons — muscle gain, weight management, endurance, or general wellness — but all share a common expectation: that the products they consume are safe and accurately labeled.
Instead of assuming that’s the case, the organization tests for contaminants like heavy metals, pesticides, and industrial chemicals, helping reveal what might otherwise go unnoticed.
This kind of independent verification is becoming more valuable as protein products move beyond specialty stores and into everyday retail environments, where consumers may have less visibility into how they’re made.
Look for Certifications That Back It Up
Certifications can make it easier to identify products that meet higher standards.
Third-party seals indicate that a product has been independently evaluated for purity and labeling accuracy. While they don’t guarantee perfection, they do provide an added layer of accountability.
Levels Protein is one example of a brand that has leaned into this approach. Its protein powders have received The Clean Label Project’s highest certification, the Purity Award, which is given to products that meet strict criteria for contaminants.
Beyond certification, the company also emphasizes extensive internal testing. According to the brand, its products have undergone more than 400 analyses, screening for substances such as heavy metals, pesticides, and plastics.
This level of scrutiny reflects a broader shift in the industry, where some companies are choosing to make testing and transparency a more visible part of their process rather than keeping it behind the scenes.
Pay Attention to Transparency
Beyond certifications, transparency itself is an important factor.
Brands that clearly explain how their products are sourced, manufactured, and tested tend to be easier to evaluate. This includes sharing information about ingredient origins, production processes, and quality control measures.
If that information is difficult to find or overly vague, it may be harder to assess how the product is made.
On the other hand, brands that openly provide details are often more accountable to consumers.
Consider How You’ll Use It
Not all protein powders are designed for the same purpose.
Some are formulated for muscle recovery, while others are aimed at general nutrition or meal supplementation. The right choice depends on how you plan to use it and what fits your routine.
Taste, texture, and mixability can also play a role, especially if you’re using protein powder regularly. A product that meets quality standards but doesn’t fit your preferences may be harder to stick with over time.
What This Means for Your Next Purchase
Protein powder can still be a convenient and effective part of a healthy routine. But as recent findings show, it’s worth taking a closer look at how products are made and tested before adding them to your daily mix.
Organizations like The Clean Label Project are helping bring greater visibility to the category, offering data-backed insights that go beyond marketing claims. Their work reflects a growing demand for accountability in the products people use every day.
At the same time, brands like Levels are beginning to respond. Some are investing more heavily in testing, pursuing independent certifications, and being more transparent about their processes and ingredients.
For consumers, this shift is a positive one. It means more tools, more information, and ultimately more control over the choices they make.