Astaxanthin Is an Antioxidant Related to Vitamin A

Salmon is high in asthaxanthin.
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Astaxanthin is a natural substance found in microalgae, krill and such seafood as salmon, trout, and shrimp. It's a carotenoid, so it's related to vitamin A, beta-carotene and the other carotenoids lutein and zeaxanthin. It may have antioxidant and anti-inflammatory properties.

If that's true, astaxanthin might be part of the reason fish and seafood are good for you (along with being low in calories and rich in healthy omega-3 fats).

Carotenoids, in general, are thought to be beneficial for your health because of their antioxidant capacity. Population studies show that people who eat diets rich in carotenoids tend to have a lower risk of cardiovascular disease. But it's really not possible to know how much of that benefit is due to any particular foods or carotenoids.

Salmon, trout, and shrimp are all good sources of astaxanthin. They're low in calories and total fat, plus they contain the essential omega-3 fatty acids. 

Health Benefits

Astaxanthin may be able to help prevent or treat cardiovascular disease, upset stomach, male infertility, macular degeneration and diabetes, and reduce the discomfort of menopause. At least, laboratory research on animals has shown some promise, but clinical studies in humans are lacking. Only a few preliminary and small, controlled trials have been published, so it's too early to know if astaxanthin is actually beneficial as a therapeutic agent or not.

Of course, substantial evidence isn't always necessary for a natural substance to be extracted, packed into pills and sold as a dietary supplement. Astaxanthin is marketed with the claims that it supports muscle endurance, improves sperm quality, promotes healthier skin and is good for your vision. But these claims are made with little or no evidence.

Astaxanthin appears to be safe, but right now there isn't any evidence that the supplements will help prevent or treat any health condition. You're probably better off getting your astaxanthin from such foods as salmon and trout and skipping the supplements. And always, speak to your healthcare provider before taking any dietary supplements.

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