Size:Pack of 3 Our Activated charcoal has 260 mg of charcoal per capsule. Activated charcoal captures unwanted material and carries it safely through. the digestive system. A natural adsorbent agent. All Windmill supplements are. manufactured in the United States in an FDA-inspected facility whose GMPs. (Good Manufacturing Practices) are independently verified by qualified. certification organizations. Free of artificial colors, flavors and. preservatives, Windmill is a trusted name that has been providing America with.