Third-Party Tested Supplements: Quality, Safety & Heavy Metal Testing
Every KOS product is third-party tested for purity, potency, and safety. Browse our certifications, look up your Certificate of Analysis, and learn about our commitment to clean, transparent supplements.
Look Up Your Certificate of Analysis
Enter your product's lot number and the last 6 digits of the UPC to view third-party test results for your specific batch.
How We Test Every Product
KOS superfoods are independently tested for purity, potency, and heavy metals. Our testing program includes both incoming raw materials and finished products, conducted at independent, ISO 17025-accredited laboratories using analytical methods including mass spectrometry and chromatography.
Our quality program includes testing for heavy metals (lead, arsenic, cadmium, mercury), microbial contaminants, pesticide residues, and other product specifications, as applicable.
Our Quality Control team establishes product specifications and testing protocols based on applicable U.S. legal requirements, supplier qualification materials, product-specific risk assessment, and internal quality standards.
Our Certifications
Certifications vary by product line:
USDA Organic (CCOF certified) - Plant protein powders, superfood blends, and single-ingredient powders.
Non-GMO Project Verified - Plant protein powders, superfood blends, single-ingredient powders, hydration proteins, and supplements.
Kosher (cRc certified) - Certain superfood blends and single-ingredient powders.
For product-specific certifications, refer to the individual product page. Products are manufactured in cGMP-audited, FDA-registered facilities and operate under current good manufacturing practice requirements applicable to dietary supplements.
Prop 65 & Supplement Safety
From ingredient sourcing to final product testing, our quality program is designed to support consistency and product quality at each stage of the process:
Ingredient Sourcing - We work with qualified suppliers review supplier qualification, ingredient documentation, and related records, as applicable, before ingredients enter our manufacturing process. Our organic product lines use certified organic ingredients verified through CCOF.
cGMP Manufacturing - Our production facilities operate under FDA-regulated Current Good Manufacturing Practices, with processes intended to support consistent production and quality controls.
Accredited Lab Testing - Independent laboratories perform analytical testing under our quality program. Manufacturing operations and product labeling remain subject to applicable legal and regulatory requirements.
Prop 65 & Safety
Frequently Asked Questions
KOS protein powders are manufactured under applicable current good manufacturing practice requirements and are tested under our quality program for heavy metals and other product specifications, as applicable.
You can access your specific batch's Certificate of Analysis using the COA tool on this page.
As with any dietary supplement, we recommend consulting your healthcare provider before use, particularly if you are pregnant, nursing, taking medication, or have a medical condition.
Plant-based foods can contain trace amounts of naturally occurring heavy metals, including lead, because plants absorb minerals from soil.
KOS tests for heavy metals as part of its quality program, and batch-specific Certificate of Analysis information is available through the COA tool on this page. California Proposition 65 has separate warning requirements based on California exposure standards.
KOS maintains quality procedures for product review and, where appropriate, corrective action. For the most current product-status information, please contact Product Support.
Third-party tested means an independent laboratory, not the manufacturer, tests the product.
KOS works with ISO 17025-accredited laboratories to perform specified analytical testing. They test for heavy metals, microbial contamination, pesticide residues, and verify other product specifications, as applicable.
California Proposition 65 (Prop 65) requires businesses to warn California consumers about significant exposure to chemicals that cause cancer, birth defects, or reproductive harm.
Many foods, including rice, spinach, sweet potatoes, and chocolate can contain naturally occuring listed chemicals that may result in the need for a Prop 65 warning.
A Prop 65 warning is a California disclosure requirement and does not, by itself, mean a product is adulterated or unlawful for sale.
Prop 65 warning requirements are separate from federal dietary supplement regulation.
Plant-based ingredients can naturally contain trace amounts of chemicals listed under Prop 65.
California’s warning framework uses its own exposure standards and is separate from federal dietary supplement regulation. Where required, KOS provides a Prop 65 warning for California consumers.
The lot number is printed on the bottom or side of your container, usually starting with a letter followed by numbers (e.g., V25175012).
The UPC barcode is on the product label. You only need the last 6 digits for our COA lookup tool.
A Certificate of Analysis (COA) is a batch-specific quality document that summarizes certain testing results and product specifications for the identified lot. The information shown may vary by product and batch.
Use the lookup tool on this page to find the COA for your specific product batch.
All plants absorb minerals from soil, including trace amounts of lead, arsenic, cadmium, and mercury.
This is true for organic and conventional crops alike. Levels can vary by ingredient, source, and growing conditions.
KOS tests for heavy metals as part of its quality program and makes batch-specific COA information available through the COA tool on this page.
KOS tests for lead, arsenic, cadmium, and mercury, which are commonly monitored heavy metals in plant-based products and dietary supplements. greatest concern in dietary supplements.
Testing is performed at independent, ISO 17025-accredited laboratories using mass spectrometry and chromatography. Results are reviewed against product specifications and applicable requirements, as relevant to the product and market.