**2. Conclusion**

L-ascorbic acid (also known as AsA or vitamin C) is a water-soluble vitamin with antioxidant properties. Its stability is essential for increasing resistance against various diseases, including premature aging, skeletal muscle weight loss, fiber atrophy, and decreased physical performance. A deficiency in vitamin C significantly reduces phagocytic activity, antibody levels, and lysozyme activity, which are crucial components of the body's immune response.
