**Applications:** **Food Industry:** As a natural antioxidant, it can prevent the oxidation and rancidity of fats in food, thereby extending the shelf life of products. It also has a flavor-enhancing effect, improving the taste and texture of foods, and is used in various meat products, baked goods, and beverages. **Medicine and Health:** It possesses antioxidant, anti-aging, and anti-glycation properties. It helps to eliminate free radicals in the body, reduce oxidative damage, and prevent cardiovascular diseases and neurodegenerative disorders. Additionally, it can alleviate exercise fatigue, enhance muscle strength and endurance, and is commonly found in sports nutrition supplements and health products. **Cosmetics:** Due to its antioxidant and anti-wrinkling effects, it is widely used in skincare products. It inhibits the glycation and degradation of collagen, reducing the formation of wrinkles and maintaining skin elasticity and radiance. It is often added to creams, serums, and eye creams. **Animal Feed Additive:** In animal farming, the addition of L-carnitine can improve growth performance and meat quality. It aids in muscle metabolism, increases the concentration of carnitine in muscles, making the meat more tender and juicy, and also enhances the animal's antioxidant capacity, as well as its immunity and stress resistance.