The Environmental Protection Agency (EPA) establishes safety limits, known as tolerances, for residual pesticides, and the Food & Drug Administration (FDA) requires botanical suppliers to comply. While most ingredients are verified through annual qualification of our suppliers’ pesticide testing, some botanicals are more susceptible to retaining pesticide residue, so Nature's Way tests to confirm every batch of the raw material complies with USP <561>.

Verifying each botanical genus, species, and plant part ensures your product contains the exact ingredient listed in the Supplement Facts panel and will support the benefit stated on the label. High-Performance Thin-Layer Chromatography (HPTLC) testing provides a detailed chemical fingerprint of the ingredient for comparison against certified botanical reference standards. HPTLC testing is among the best, most reliable methods for authenticating raw materials.

Every ingredient is tested to meet regulatory standards for heavy metals, including arsenic, cadmium, mercury, and lead. Testing for trace metal levels ensures ingredients comply with protective laws like California’s Proposition 65, and that the supplement won’t expose you to harmful levels of chemicals.

Nature’s Way tests every ingredient for microbial contaminants that can break down ingredients, decrease potency, and degrade a product’s quality. Verifying that ingredients meet regulatory standards for microorganisms like bacteria, molds, and yeasts helps ensure a safe and compliant product.