# Lawsuit claims Costco protein powder has dangerous lead, arsenic levels

A lawsuit has been filed against Costco, alleging that its Kirkland Signature protein powder contains elevated levels of lead and arsenic. The plaintiff claims the product poses a health risk to consumers. The case highlights ongoing concerns about heavy metal contamination in dietary supplements.

**Importance:** 3/5

## Sources

### Business
- [Fox News Business](https://www.foxbusiness.com/retail/costco-hit-lawsuit-alleging-protein-powder-sold-stores-contains-dangerous-levels-lead-arsenic) — Thu, 09 Jul 2026 21:33:04 GMT

### Technology
- [Ars Technica](https://arstechnica.com/tech-policy/2026/07/lawsuit-claims-metas-layoff-decisions-were-made-by-ai-not-humans/) — Tue, 14 Jul 2026 20:05:53 +0000