Astaxanthin: sources, health effects and food industry uses
What it found
Astaxanthin is a pink-red pigment used mostly in fish feed.
In lab and animal studies it acts as a strong antioxidant, but its use in food is limited by high cost and by uncertainty about long-term effects of the synthetic form in people.
What they found
Studies in people
Skin and immunity
When taken by mouth, astaxanthin improved skin condition in men and women, reducing wrinkle depth and age spot size and improving elasticity and moisture. An immune effect was seen in clinical trials at a daily dose of 2 mg.
Animal and lab studies
Antioxidant strength
In lab tests, astaxanthin protected membrane fats from oxidation more effectively than beta-carotene and lutein. Its antioxidant activity was reported as 10 times higher than beta-carotene and 100 times higher than vitamin E.
Stability and uptake
Astaxanthin is unstable when exposed to heat, light, acid or oxygen, and it dissolves poorly in water (83 mg/L), which limits how much the body can take up. Encapsulation in tiny particles or in cyclodextrins improved its stability and water solubility in lab studies.
Studies in people and animals
Health effects studied
Research has pointed to possible uses in preventing or treating conditions linked to reactive oxygen species, including some cancers, neurodegenerative diseases, eye diseases, atherosclerosis and type 2 diabetes. It has also been studied for stomach inflammation caused by Helicobacter pylori and for vocal fold inflammation.
Other findings
Dose guidance
Natural astaxanthin producers suggest 4 to 12 mg a day for health benefits. The EFSA panel recommends a maximum daily dose of 4 mg from Haematococcus pluvialis (AstaREAL supplements), which is 0.06 mg per kg body weight per day for a 70 kg person.
Synthetic vs natural
Synthetic astaxanthin is a mix of stereoisomers, some not found in nature, and is less stable and less well absorbed than the natural form. Natural astaxanthin is the form used in supplements for people.
What the authors conclude
“Natural astaxanthin is a bioactive compound whose anti-oxidative activity and health-promoting properties, resulting from its unique structure, have been well-documented.”
Also in their conclusions
- They say natural astaxanthin is a bioactive compound whose antioxidant activity and health-promoting properties are well documented.
- They note that its high price and limited sources mean it is little known to consumers and underused by food producers, so information about it should be spread.
- They state that putting astaxanthin into nanodispersion systems is a promising alternative to using water-insoluble astaxanthin in water-based foods.
How it was done
The authors wanted to review what is known about astaxanthin's structure, health-promoting properties, commercial sources and industrial uses, and to set out the possibilities and limitations of using it in food technology, including costs and food safety.
They pulled together published research on astaxanthin's chemical structure, its natural and synthetic sources, its measured health effects, and methods such as micro- and nanoencapsulation that aim to make it more stable and easier for the body to take up.
What it can’t tell you
- Many of the health effects come from lab and animal studies, so they cannot show what happens in people.
- The long-term effects of eating synthetic astaxanthin in people are not known.
- No cause and effect has been established between astaxanthin consumption and normal joints, tendons, connective tissue, DNA protection, visual acuity or blood cholesterol.
Who paid
- Conflicts
- The authors declare no conflict of interest.
- Authors work at
- Poznan University of Life Sciences, Poland
The paper
- Title
- Astaxanthin for the Food Industry
- Type
- ReviewThe authors read earlier studies and describe what they found. It isn’t a new study.
- Evidence
- Studies in people · animals · lab
- Summarised from
- Full text
- Cite
- Stachowiak B, Szulc P (2021). Astaxanthin for the Food Industry. Molecules (Basel, Switzerland). doi:10.3390/molecules26092666Free full textPubMed 34063189DOI
Summary written 26 Sep 2026. Check it against the paper before it changes what you eat. How we summarise papers · Report an error