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A carotenoid, astaxanthin is extensively distributed in microbes and marine species. At the upcoming time, astaxanthin will have the most share of the worldwide carotenoids market due to its widespread application in animal feed, cosmetics and nutraceuticals. Because of its distinct molecular makeup, astaxanthin has strong antioxidant properties and may be useful in biochemical research. We now have a better knowledge of how esterification and isomerization contribute to the structure-function connection of dietary astaxanthin thanks to recent studies. Astaxanthin (AST) is a red carotenoid pigment that is used in food, animal feed, cosmetics, medicine, and nutraceuticals. Fish, crustaceans, algae, and birds that are naturally occurring all contain astaxanthin, mostly in the form of fatty acid esters. Numerous studies have shown that astaxanthin has positive effects when used as a medicinal agent in animal diet. Numerous important biological effects of astaxanthin include antihypertensive, antioxidant, anti-obesity and anti-carcinogenic characteristics. As a potent immunomodulator to preserve the health and wellbeing of both people and animals, astaxanthin has lately grown in popularity. Astaxanthin is widely used in the production purpose in animal as well as in medical sciences. Understanding the structure, origin and mode of action of astaxanthin in the body offers a theoretical foundation for its therapeutic use and might improve the screening of substances linked to the treatment of numerous disorders. With a focus on practical applications, this review article tries to make clear astaxanthin's key characteristics, including its bioavailability, therapeutic effects and synthesis. It is anticipated that knowledge of these advantages and production would help the livestock sector create nutritional programmes that guarantee the protection of animal health. [ABSTRACT FROM AUTHOR]