Brimming with omega-3s, oils that are beneficial for your heart, brain and joints, salmon is one of the healthiest fish you can buy. High in protein and an excellent source of heart-protective vitamin E, salmon is also one of the few dietary sources of vitamin D, a crucial nutrient for keeping your bones strong.A rich source of protein, salmon is also high in vitamin A (great for healthy eyes and skin) and vitamin D (needed to make bones strong and guard against osteoporosis). Salmon is a beneficial source of selenium, too, which helps to boost the immune system and regulate the thyroid gland. Here's a unique way to add salmon to your dinner menu.