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Active ingredients used in Klaire Labs® brand products are selected based on their purity, bioavailability, documented actions, and safety characteristics. USP materials (i.e. those meeting USP standards) are used for those nutrients where this standard exists. Raw materials are purchased exclusively from reputable vendors who provide detailed Certificates of Analysis for every lot of material. These certificates certify that active components, toxic elements, and microbial content are within specified acceptable parameters. Purity and potency of selected raw materials are verified through independent testing laboratories by raw material vendors and ProThera®, Inc. All incoming raw materials undergo quarantine, inspection, and evaluation.