Casein & Gluten Free Hypoallergenic Dietary Supplement Kirkman manufactures Grapefruit Seed Extract (GSE) capsules at the request of physicians and health care practitioners who use GSE orally for gastrointestinal support. This is a hypoallergenic product formulated for individuals with special requirements and sensitivities. Our Grapefruit Seed Extract is offered as 125 mg capsules. Ultra Tested - Tested for more than 950 contaminants! Heavy metals Bacteria Yeast Mold Pesticides & More..