Consumers filed a class-action lawsuit against Costco Wholesale Corporation accusing the retailer of selling Orgain Organic Plant-Based Protein Powder products contaminated with toxic heavy metals without disclosing the risk to buyers. The lawsuit, filed in the U.S. District Court for the Western District of Washington on July 7, 2026, alleges that despite marketing the protein powder as "high quality, clean, and nutritious," the products contained unsafe levels of lead, cadmium, and arsenic.

Independent laboratory testing by The Clean Label Project and Consumer Reports found detectable levels of heavy metals in the affected products. The results indicate that Costco sold Orgain products with undisclosed lead levels reaching 67 ppb, which exceeds recognized safety thresholds by more than 600%. Cadmium levels tested as high as 70.3 ppb, and arsenic levels reached 19.8 ppb.

Contamination Levels and Health Risks

The World Health Organization states there are no known safe levels of exposure to heavy metals, which accumulate in the body over time. Health effects linked to heavy metal exposure include various cancers, reproductive problems, nervous system disorders, gastrointestinal issues, and immune system dysfunction.

Allegations Against Costco

Attorneys allege that Costco, as a major national retailer with sophisticated supply-chain management and quality control processes, knew or should have known about the contamination. The lawsuit claims the retailer continued to sell the products without warning consumers, using marketing language such as "quality ingredients, higher standards" and "delivering clean nutrition" to capitalize on health-conscious buyers.

The complaint notes that Orgain products are sold for $0.79 to $0.80 per oz., while comparable protein powder products with non-detectable levels of heavy metals are available at prices as low as $0.42 per oz. The lawsuit brings claims of fraudulent concealment, unfair trade practices, and violations of state consumer protection laws. Plaintiffs seek punitive damages and injunctive relief requiring Costco to stop selling the affected protein powder without adequate disclosure.

Costco Wholesale has delivered an average annual return of 19.25% over the past decade, outperforming the market by 5.72% on an annualized basis. This performance highlights the impact of compounded returns on long-term equity growth. The company currently commands a market capitalization of $420.68 billion.

Investment Growth Analysis

An investor who purchased $1000 of Costco stock 10 years ago would see that investment grow to $6,100.06 today. This valuation is based on a current share price of $948.52. The substantial increase underscores the potential benefits of long-term holding periods in high-performing equities.

Key Financial Metrics

The primary takeaway from this data is the significant effect that compounded returns can have on cash growth over extended periods.