Collagen is the main structural protein in skin, bones, tendons, and ligaments. Supplements use collagen from bovine, porcine, or marine sources that has been broken down into peptides for better absorption.
People take collagen powder or capsules to maintain skin elasticity and hydration. Daily doses mixed into coffee, smoothies, or food are common, usually in the morning or with a meal. The peptides also support joint comfort and flexibility.
Check the source if you have a fish or shellfish allergy. Some people notice mild digestive upset, though most tolerate it fine.