Tetrahydrocurcumin is a major bioactive metabolite of curcumin, the active polyphenol found in the spice turmeric. Unlike curcumin, which has poor bioavailability and is rapidly metabolized in the body, tetrahydrocurcumin is more stable and water-soluble, allowing for greater absorption and longer-lasting activity in the system. It exhibits potent antioxidant, anti-inflammatory, and skin-brightening properties, and is often regarded as even more effective than curcumin itself in certain biological activities. Due to its superior stability and bioavailability, tetrahydrocurcumin is widely used in dietary supplements, functional foods, and skincare products to support overall wellness, joint health, cognitive function, and healthy aging.