In the last decade, scientists took note of the fact that raspberry ketone is molecularly similar to capsaicin. Capsaicin is the chemical in chili peppers that gives it heat. As more studies about raspberry ketone are conducted, the scientific community is learning more and more. Our Raspberry Ketones are highly concentrated. Each serving of this dietary supplement contains 100mg of raspberry ketones. Rapid release capsules. About Puritans Pride For more than 40 years, Puritan’s Pride has helped families achieve a lifestyle of wellness. Our vitamins and supplements are made with care from the highest quality ingredients. They are tested or inspected as many as 15 times throughout the manufacturing process. That’s why you can shop with confidence. We take pride in our products and helping customers feel their best.