Algae are primary producers that provide a diverse range of nutrients. While the high protein content of different species is one of the major reasons for considering them as an alternative source of protein, microalgae oils rich in certain PUFAs seem to be particularly beneficial for youngsters, pregnant women, vegetarians, and people with seafood allergies. Because algae are high in vitamins, minerals, antioxidants, and natural colorants, integrating the whole biomass into food and feed may help to provide color, nutritional value, texture, and oxidation resistance. Microalgae biomass may be used into conventional meals to produce novel items that are both attractive and nutritious. Even when used in small amounts in the nutrition of various animals, algae have been credited with improving the immune system, increasing weight, the number of eggs, reproductive performance, or lowering cholesterol levels, indicating the possibility of new farming methods to improve the quality of meat and eggs. They're also essential in aquaculture since they're a natural food source for these creatures. Finally, owing to its high protein content and numerous bioactive chemicals, the microalga Spirulina is nature's richest and most complete source of organic nutrition, and it has become a health food throughout the globe.