If you have been considering switching to a vegan protein powder, or if you are lactose sensitive and wondering whether plant based protein is a safer choice for your body, this is one of the most important things you can read right now. A wave of major independent investigations published in 2024 and 2025 has uncovered something the supplement industry has largely avoided talking about openly: plant based protein powders consistently contain significantly higher levels of heavy metals than whey protein, and the data is coming from some of the most credible sources in consumer health journalism.

This post is not an attack on vegan protein. Plant based diets are legitimate, valuable, and important. The goal here is to give you the honest, research-backed picture so you can make an informed decision about what you put in your body every single day — because for most people, a protein shake is a daily habit, not an occasional thing. Chronic daily exposure is exactly where heavy metal accumulation becomes a real health concern.

What Are Heavy Metals and Why Do They Matter in Protein Powder

Heavy metals are naturally occurring elements found in soil and water. The four that matter most in the context of protein powder are lead, cadmium, arsenic, and mercury. At trace levels they are unavoidable — they exist naturally in food, water, and the environment. The concern is not a single exposure. The concern is what happens when you consume a product containing these metals every single day for months or years.

When heavy metals accumulate in the body over time the health consequences are serious. According to a clinical pharmacologist writing for PBS NewsHour, repeated heavy exposure to heavy metals can delay or impair mental functioning, damage nerves, soften bones, and raise blood pressure, which in turn increases the risk of strokes and heart attacks. Heavy metals can also increase the risk of developing cancer. These are not theoretical risks. They are well documented consequences of chronic exposure at elevated levels.

The reason this conversation is suddenly happening now is because of a series of major independent investigations that tested popular protein powder products and published their findings publicly. What those investigations found was not reassuring for plant based protein consumers.

What the Research Actually Found

The Clean Label Project conducted one of the most comprehensive independent analyses of protein powder contamination, testing 160 products from 70 popular brands and running nearly 36,000 individual tests for contaminants including heavy metals, hormone disruptors, and other concerning substances. CNN reported on the findings in January 2025: plant based powders made from soy, rice, and peas contained three times more lead than whey based products. Nearly 80 percent of plant based and organic protein powders tested were over California's Proposition 65 limit for lead, compared to only 28 percent of whey based products.

A separate major investigation by Consumer Reports published in October 2025 tested 23 popular protein products and found two-thirds contained more than the threshold the organization considers concerning for lead. Their follow up testing in early 2026 specifically found that whey based protein powders consistently tested lower for lead than plant based alternatives, with the two highest-lead products both using pea and rice as their protein base.

PBS NewsHour covered the Consumer Reports findings with analysis from a clinical pharmacologist at the University of Connecticut who noted that consumers can meaningfully limit heavy metal exposure by choosing dairy or animal based protein sources, since they generally showed significantly less contamination than plant based alternatives in the testing data.

The findings on cadmium are particularly striking. A VegNews analysis citing registered dietitian Jennifer Scherer noted that some rice, pea, and soy protein powders contained five times more cadmium than whey protein powders. Scherer described the health implications directly: cadmium is classified by the World Health Organization as a Group 1 carcinogen and is linked to serious kidney damage and bone deterioration with long term exposure.

Why Plant Based Protein Has Higher Heavy Metal Levels

This is not a manufacturing failure or a quality control problem in most cases. It is a fundamental biological reality of how plants grow. As Chemistry and Engineering News explained, plants absorb lead and other heavy metals directly from the soil as they grow. Root vegetables tend to accumulate higher concentrations than other plants, and crops like rice and peas grown in certain regions or soils will naturally contain more heavy metals regardless of how carefully the manufacturing process is managed.

Dairy based proteins like whey come from cow's milk rather than plant material. Because the heavy metal absorption pathway is different for animals than for plants, whey protein consistently tests lower for these contaminants across multiple independent studies. This is not about organic versus conventional farming either. The Clean Label Project actually found that organic plant based protein powders had three times more lead and twice as much cadmium as non-organic plant based options — because organic farming often relies on soil amendments that can introduce higher levels of naturally occurring heavy metals.

What This Means If You Are Considering Vegan Protein

The research does not mean all vegan protein powders are dangerous. It means the risk profile is meaningfully different from whey and worth understanding before you commit to a daily habit. A few things are clear from the data.

Among plant based options, pea protein generally tests lower for heavy metals than rice protein. Research cited by VegNews shows pea plants absorb fewer heavy metals from soil than rice plants, making pea protein the relatively safer plant based choice when whey is not an option. Sourcing matters enormously too — brands that publish their ingredient sourcing, use North American grown ingredients, and conduct third party testing for heavy metals are meaningfully lower risk than brands that do not.

The other important variable is frequency. An occasional vegan protein shake carries very different risk than drinking one every single day as part of a daily routine. The chronic exposure scenario — which is exactly how most people use a protein powder — is where the accumulated heavy metal intake becomes a legitimate concern worth factoring into your decision.

Why Infi Uses Whey and What We Did About Digestibility

The choice to build Infi around whey protein was deliberate and informed by exactly this kind of research. Whey protein isolate is not only the most bioavailable protein source available, it consistently tests cleaner for heavy metal contamination than plant based alternatives. For a product designed to be your one daily shake for months and years at a time, that matters enormously.

The most common objection to whey protein is digestibility. Many people who are lactose sensitive find that standard whey causes bloating and discomfort, which is one of the reasons plant based protein became appealing in the first place. Infi addresses this directly by including lactase and protease enzymes in every scoop. Lactase breaks down the lactose in whey so your body does not have to struggle with it. Protease supports protein digestion more broadly. The result is a whey based shake that is significantly more accessible for people with dairy sensitivity without requiring a switch to a protein source that carries higher contamination risk.

You can read more about the full Infi formula and why each ingredient was chosen on the Boba Nutrition founder story page.

What About a Clean Vegan Option

We hear from customers regularly who follow a plant based diet and want a boba protein option that aligns with their values. It is a completely legitimate request and one we take seriously. Developing a vegan version of Infi is something we are actively working on. When we do it, the approach will be the same one we took with Infi — choosing the protein source with the lowest contamination risk, conducting rigorous third party testing, and being transparent about ingredient sourcing so our customers can make an informed decision.

The research is clear that not all plant based proteins carry the same risk profile. Pea protein from North American organic sources tested significantly cleaner in multiple studies than conventionally farmed rice or soy protein. A vegan Infi built around carefully sourced, third party tested pea protein is a very different product from the generic plant based powders that showed up in the Consumer Reports data. We will not launch it until we are confident in the safety and cleanliness of the formula.

How to Make a More Informed Choice Right Now

Whether you are choosing Infi or evaluating any other protein powder, here are the questions worth asking before committing to a daily habit.

Does the brand conduct third party testing for heavy metals and publish the results? Brands that are serious about contamination testing will show you the data rather than just claiming their product is clean. Does the product use whey, egg, or carefully sourced pea protein rather than rice or soy, which consistently test higher in contamination studies? Is the protein sourced from North America or regions with stricter soil contamination regulations? And does the brand disclose their manufacturing facility and ingredient sourcing transparently?

These are not unreasonable questions. As Consumer Reports noted, brands that publish detailed sourcing and testing information are the gold standard in an industry where regulatory oversight remains limited. The more a brand is willing to show you about what is in their product and where it comes from, the more confident you can be about drinking it every single day.

For a full breakdown of how Infi compares to other boba protein options in the category, check out our comparison guides on the Boba Nutrition blog.