Last updated 24 October 2026.
Some of the most striking colours in nature come from a single molecule. It turns salmon pink, it colours krill and shrimp, and it is made by a microscopic alga that produces it when it is under stress.
Astaxanthin is a red-orange pigment, known as a carotenoid, that acts as an antioxidant. It is made by microalgae and found in salmon, krill and shrimp. Research on astaxanthin benefits is early and mixed, and no health claim is authorised for it in Great Britain.
That is worth knowing before you buy anything. This guide covers what astaxanthin is, what studies have and have not shown, how they dosed it, and who should speak to a GP first.
Ageing is partly a story about how well your cells cope with wear. Oxidative stress, the build up of damaged cells and low-grade inflammation are all features of how we age (López-Otín et al., 2013; Franceschi et al., 2018). That is why researchers study antioxidants such as astaxanthin.
This is part of cellular resilience, one of the five systems that shape how well we age, and it links closely to healthspan. Not how long you live, but how many of those years you spend capable and independent. Interest in astaxanthin comes from that question. The evidence for it is still early.
Astaxanthin is a fat-soluble carotenoid, the same family of pigments that colours carrots and tomatoes. Its natural source is a microalga called Haematococcus pluvialis, which makes it when it is stressed. Fish and crustaceans that eat the algae, such as salmon, krill and shrimp, take on the colour (EFSA NDA Panel, 2020).
That means a normal diet can contain small amounts, mostly from fish and shellfish. Supplements usually use the algae directly.
Researchers have looked at several areas, and the results are uneven. Here is what the evidence supports and what it does not.
A systematic review of nine randomised trials found that astaxanthin lowered some markers of oxidative stress compared with baseline. Compared with a control group, the difference was only borderline. The effect was seen at higher doses of 20 mg a day or more, but not at lower doses, and for some markers it showed at three weeks but not at 12 weeks or three months. The authors concluded that the antioxidant effect of astaxanthin in humans is unclear (Wu et al., 2020).
A meta-analysis of randomised trials of carotenoids found that astaxanthin lowered CRP, a blood marker of inflammation, by a small amount (Hajizadeh-Sharafabad et al., 2022). A marker is not the same as how someone feels, and a small change in a number does not tell you what it means for your health.
What the research does not show is that astaxanthin slows ageing, adds years to life or protects any particular organ. You may see claims about skin, eyes and tanning. They sit outside this guide, and no health claim is authorised for any of them.
Not all astaxanthin is the same, and the source matters. The table shows the main ones.
| Source | What it is | What research says |
|---|---|---|
| Microalgae (Haematococcus pluvialis) | Natural astaxanthin, grown and harvested from algae | A review of 87 human trials found no serious safety concerns with natural astaxanthin (Brendler and Williamson, 2019) |
| Synthetic | Made in a laboratory and chemically different from the natural form | The same review said it should not be used for direct human consumption until its safety is established (Brendler and Williamson, 2019) |
| Food | Salmon, krill and shrimp, which take it from the algae they eat | Contributes a small amount to the diet (EFSA NDA Panel, 2020) |
AEVUM wrote this guide, so we have tried to be fair to every source, including the ones we do not use. The safety work covers natural astaxanthin, so that is the one to look for on a label.
The honest answer is that natural astaxanthin looks well tolerated, and that nothing is risk free. The review of 87 human studies, with more than 2,000 people, reported no serious adverse events and no signs of liver toxicity. The one effect noted was reddening of the stool at high doses (Brendler and Williamson, 2019).
The European Food Safety Authority assessed astaxanthin from algae as safe for adults at up to 8 mg a day in supplements, on top of what comes from the diet (EFSA NDA Panel, 2020). Food supplement labels carry a statement that they should not be given to infants and children under 10.
Speak to your GP or pharmacist before starting any new supplement if you take prescription medicines, are pregnant, trying to conceive or breastfeeding.
Doses in trials vary a lot, and there is no agreed figure. Here is what the research has used. This is what studies did, not a recommendation.
| Source | Dose | What it looked at |
|---|---|---|
| EFSA NDA Panel, 2020 | Up to 8 mg a day from supplements | Safety for adults, alongside the normal diet |
| Brendler and Williamson, 2019 | Up to 12 mg a day long term, up to 100 mg a day short term | Safety across 87 human trials. Recommended or approved doses ranged from 2 to 24 mg a day between countries |
| Wu et al., 2020 | Under 20 mg a day, and 20 mg a day or more | Markers of oxidative stress. The higher dose group showed effects on some markers |
The studies that show effects used more than the amount EFSA assessed for supplements. That is part of why the picture is unclear. More is not better.
With food is the usual advice. Astaxanthin is fat-soluble, so it is generally taken with a meal that contains some fat. The time of day matters less than taking it consistently.
It depends on who you are, and the honest answer is that nobody knows for certain. Eating salmon or shellfish gives you a little. For most healthy people there is no proven need to supplement.
If you decide to take one, look for these.
Astaxanthin is one part of a bigger picture, and so is Daily Vitals. Daily Vitals contains natural astaxanthin from Haematococcus pluvialis microalgae at 5 mg a day, alongside nine other ingredients, in one simple daily step. Astaxanthin has no authorised health claim in Great Britain, so we do not make one.
What we can say is that vitamin C and zinc each contribute to the protection of cells from oxidative stress (Great Britain NHC Register). They sit alongside strength, movement, sleep and food, which still do the heavy lifting. You can see every ingredient on our ingredients page. Feel better now. Age better later.
Speak to your GP or pharmacist before starting astaxanthin if you take prescription medicines, are pregnant, trying to conceive, breastfeeding, due to have surgery or have a medical condition. It is not suitable for infants or children under 10.
Always follow the dose on the label, and remember that a food supplement should not replace a varied diet or medical advice. See your GP if you have any symptom that worries you.
Astaxanthin is found in food and has been studied as an antioxidant. Whether taking extra helps is a different question, and the research is early and mixed. For most healthy people there is no proven need to supplement.
Salmon, krill and shrimp contain it, because they take it from the algae they eat (EFSA NDA Panel, 2020). The amounts are small compared with the doses used in some trials.
A review of 87 human trials found no serious safety concerns with natural astaxanthin (Brendler and Williamson, 2019). EFSA assessed up to 8 mg a day from supplements as safe for adults (EFSA NDA Panel, 2020). Speak to your GP first if you take any medicine.
The safety evidence covers natural astaxanthin. The authors of the main safety review said synthetic astaxanthin should not be used for direct human consumption until its safety is established (Brendler and Williamson, 2019).
We do not think anyone can say. In one review some markers changed at three weeks but not later, and the authors called the overall effect unclear (Wu et al., 2020).
No. Food supplements containing astaxanthin carry a statement that they should not be given to infants and children under 10.
Often yes, but check with your GP or pharmacist if you take any medicine. Because it is fat-soluble, it is usually taken with a meal.
Keep reading
What is biological age, and can you slow it down?
What is longevity, and what role does inflammation play?
CoQ10 benefits and longevity
References
Brendler, T. and Williamson, E.M. (2019). Astaxanthin, how much is too much, a safety review. Phytotherapy Research. doi.org
EFSA Panel on Nutrition, Novel Foods and Food Allergens (NDA) (2020). Safety of astaxanthin for its use as a novel food in food supplements. EFSA Journal. efsa.europa.eu
Franceschi, C. et al. (2018). Inflammaging, a new immune-metabolic viewpoint for age-related diseases. Nature Reviews Endocrinology, 14, 576–590. doi.org
Great Britain Nutrition and Health Claims (NHC) Register. Department of Health and Social Care. gov.uk
Hajizadeh-Sharafabad, F. et al. (2022). Carotenoids supplementation and inflammation, a systematic review and meta-analysis of randomized clinical trials. Critical Reviews in Food Science and Nutrition. doi.org
López-Otín, C. et al. (2013). The hallmarks of aging. Cell, 153(6), 1194–1217. doi.org
Wu, D., Xu, H., Chen, J. and Zhang, L. (2020). Effects of astaxanthin supplementation on oxidative stress. International Journal for Vitamin and Nutrition Research, 90(1-2), 179–194. doi.org
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