Astaxanthin Explained Simply

1. What Is Astaxanthin?

Astaxanthin is a natural red pigment. It belongs to the group of carotenoids (plant pigments). In nature, it colors sea creatures such as crabs, shrimp and salmon pink to red. The feathers of flamingos are also turned red by it. As a dietary supplement, it is available in capsules. In fish farming, it is used so that farmed salmon get their red color.

2. Where Is It Found, and What Is It Made From?

Astaxanthin is produced in tiny algae, especially in the species Haematococcus pluvialis. Certain yeasts also form the substance. Through the food chain, it reaches krill, shrimp, crabs and salmon. For dietary supplements, it is mostly obtained from these algae. There is also astaxanthin from yeast and from chemical production. It is offered as a capsule with oil, as algae extract and rarely as a cream for the skin.

3. What Does Astaxanthin Do? What Research Shows

Oxidative Stress and Inflammation

This is about cell protection and inflammation in the body. In several studies, inflammation values fell more than with a sham preparation 2627. For other protective markers, the results were mixed: sometimes better than the sham preparation, sometimes the same 283646. A review classifies the protective effect of astaxanthin against oxidative stress overall as unclear 20. Larger studies with uniform measurements are still pending.

Cardiometabolic Markers

This is about blood sugar and blood lipids. In prediabetes and type 2 diabetes, a review found that blood sugar, long-term blood sugar and several blood lipid values fell compared with the comparison group 2. Two studies with the same design also found better blood sugar and blood lipid values than with a sham preparation 3435. The "good" HDL cholesterol rose in three reviews 21022. For LDL cholesterol, the reviews were inconsistent. Body weight and body mass index did not change 214.

Exercise and Physical Performance

This is about recovery and performance in sports. After exertion, a marker for muscle damage was lower than with a sham preparation in a review and two studies 94245. For performance, the reviews are inconsistent: one found better performance with training 4, a larger one found no improvement 9. In small studies, time trial time was shortened, and endurance until exhaustion was longer 4445. Whether this translates into noticeably faster recovery is open.

Skin

This is about skin protection and skin aging. In a small study, the skin tolerated more UV light until redness and lost less moisture than with a sham preparation 43. In another study, wrinkles and moisture worsened only in the group with the sham preparation, not with astaxanthin 47. A review sees advantages, but many studies were small and funded by companies 19. A mixture with collagen helped, but does not allow any statement about astaxanthin alone 48.

Cognition

This is about memory and thinking performance. In healthy older people with forgetfulness, individual tests improved, but no confirmed difference from the sham preparation was shown 25. A review found no effect on reaction time 4. Clearer advantages were shown only by mixtures with other substances 3039. In young athletic women, reactions after mental fatigue in two tasks became faster only with astaxanthin 49. Larger studies with astaxanthin alone are still pending.

Eyes

This is about eye strain and dry eyes. In schoolchildren with screen strain, astaxanthin reduced complaints and visual fatigue more than the sham preparation 31. Visual acuity and focusing did not change. A mixture with anthocyanin and lutein improved screen fatigue 38. In dry eye, a mixture with other antioxidants improved only the overall impression, not the complaints 40. A study without a comparison group showed improvement in dry eye 51. Whether the effect comes from astaxanthin or from the mixture partners is open.

Tolerability and Safety

This is about tolerability. In controlled studies (with a comparison group) with astaxanthin alone, no side effects and no notable safety values were found 25313350. It was also safe as an addition to the treatment of pneumonia 27. Two reviews report no serious adverse events 1719. Mixed preparations were also well tolerated 2324. Data on intake for more than a few months are still pending.

Other Investigations

This is about further applications. In women with PCOS before artificial fertilization, the proportion of mature eggs was higher than with a sham preparation 3746. Pregnancy rates did not differ 1646. In men with impaired sperm quality, no semen value changed 29. In rheumatoid arthritis, disease activity fell more than with a sham preparation 32. In pneumonia, severity values improved 27. These findings come from individual small studies and need replication.

4. How Was Astaxanthin Taken in the Studies?

In the studies, astaxanthin was almost always swallowed as a capsule. It often came from the alga Haematococcus pluvialis, sometimes from the bacterium Paracoccus carotinifaciens or without precise specification. Individual studies tested mixtures, for example with lutein, krill oil, collagen or dark chocolate. The origin and exact form of the astaxanthin were not described in many studies. The table shows how high the doses were.

5. Is Astaxanthin Safe? Side Effects in the Studies

Astaxanthin alone was well tolerated in the studies. With a mixed preparation of krill oil, astaxanthin and hyaluronic acid, fewer people reported complaints than with a sham preparation; the most common in both groups were gastrointestinal complaints 23. However, the studies were mostly small and lasted only a few weeks to months. Therefore, little is known about intake over many months. Mixed preparations do not allow any statement about astaxanthin alone. Many studies do not describe the origin and form of the astaxanthin precisely.

All details with tables and sources: full expert page on Astaxanthin