Antioxidants help the body deal with free radicals — unstable molecules that are formed during normal metabolism and also under the influence of pollution, smoking, intense physical load, or lack of sleep. Selenium is involved in the work of antioxidant enzymes, including glutathione peroxidase, which helps protect cells from oxidative damage. Vitamin C, on the other hand, works in the water-based environment of the body and helps neutralise reactive compounds there. Because they work in different areas, the two nutrients complement each other well.
Selenium is also valued for its role in normal immune function, and vitamin C is widely known as a classic nutrient for the immune system. That makes this combination relevant for people who want to maintain resilience during colder months, travel, high workloads, or recovery after demanding periods. The source further notes that selenium is linked with thyroid function and the maintenance of hair and nails, although this product is usually selected mainly for antioxidant and immune-focused use.
The body does not make selenium, so regular intake matters. This product simply contributes these two nutrients to what you get from food; it is not a substitute for a balanced diet.