Quick Summary
Which astaxanthin supplement is best?
 Choosing the right astaxanthin supplement matters: some products sold online have been reported to contain little of the astaxanthin promised on their labels. The good news? All of the popular brands ConsumerLab selected for testing contained their listed amounts — or more.
But there was a big difference in value. We found that the same amount of astaxanthin can cost less than half as much from one brand compared with another, with no clear reason to pay more. See ConsumerLab's test results and its Top Picks for low-dose and high-dose astaxanthin to find the best options.
Astaxanthin supplements tested include those by AX3, BulkSupplements.com, California Gold Nutrition (AstaLif), Double Wood (AstaReal), Nutrex Hawaii (BioAstin), Life Extension, NOW, Nutricost, and Sports Research.
What is astaxanthin?
Astaxanthin is a red carotenoid and antioxidant that is naturally produced by microalgae and may also be produced synthetically (see What It Is).
What does astaxanthin do?
Astaxanthin supplements are promoted for a wide variety of uses, such as increasing physical endurance, reducing inflammation, reducing wrinkles, protecting from sunburn, and lowering triglyceride levels. However, the evidence supporting these uses is mixed (see What It Does).
How do you take astaxanthin?
Because astaxanthin is fat-soluble, take it with a meal that contains fats or oils to increase absorption. There is no established safe and effective dose for astaxanthin, but daily doses between 4 mg and 18 mg have shown some benefits without reported side effects in clinical studies, although long-term studies are needed (See ConsumerTips™). Red coloration of stool may occur at a dose of 20 mg or more (See Concerns and Cautions for more information).
Products tested in 2026
+— 39 sources
In addition the results of its expert testing, ConsumerLab uses only high-quality, evidence based, information sources. These sources include peer-reviewed studies and information from agencies such as the FDA and USDA, and the National Academy of Medicine. On evolving topics, studies from pre-print journals may be sourced. All of our content is reviewed by medical doctors and doctoral-level experts in pharmacology, toxicology, and chemistry. We continually update and medically review our information to keep our content trustworthy, accurate, and reliable. The following sources are referenced in this article:
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You must be a member to get the full test results and quality ratings. You'll get test results and quality ratings for nine astaxanthin supplements selected for testing by ConsumerLab.
In this comprehensive review you'll discover:
 Which astaxanthin supplements passed or failed our testing and why- ConsumerLab's Top Picks among astaxanthin supplements for quality and value
- The clinical evidence for, or against, using astaxanthin for physical endurance, inflammatory conditions such rheumatoid arthritis and carpal tunnel syndrome, lowering triglycerides, and skin improvement
- The amount and form of astaxanthin in each supplement and how these compare amounts used in clinical studies
- Differences between the natural and synthetic forms of astaxanthin
- What to look for on astaxanthin supplement labels
- Astaxanthin dosage for specific uses
- Potential side effects and drug interactions with astaxanthin
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The "Latest Update" date indicates when new clinical or product information was most recently added. In the full review (available to CL members), the newest information is highlighted in yellow and, if a new product is added, it is footnoted in the results table, showing the date added to the review. The year(s) when testing was completed for the products in the review appears at the end of the Summary section.
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