Innovative Grade US Origin Guinea Pig Complement Serum from Innovative Research is manufactured using whole blood collections from guinea pigs. The animals used for this material are of US Origin, ensuring that only the highest-quality material is used for the production of the serum. This product is processed using a proprietary process that preserves complement activity. We do not recommend thawing this product for aliquoting, as this can impact the complement activity - custom volumes are available upon request. We offer reliable, consistent products that deliver reliable, consistent results.