Astaxanthin
Antioxidant ·Exploratory record · not publication-reviewed ·Updated July 13, 2026
The most powerful carotenoid antioxidant, 6,000x more effective than vitamin C at quenching singlet oxygen (a specific lab assay, not general potency). Gives salmon and flamingos their pink color. Exceptional for skin, eye, and cardiovascular protection.
Exploratory record, not a reviewed medical publication.
See the editorial and medical-review policies for the publication gate.
This generated database record has not completed a claim-level review by a qualified human medical reviewer. Bibliography links and evidence labels are not approval. The page remains available for reference and is excluded from search indexing.
What the research says.
A quick, data-only summary. The full evidence, dosing, and sources are below.
Astaxanthin is an antioxidant most often used for skin protection (uv), eye health, cardiovascular health. NutriStack rates the overall evidence as moderate. A typical adult dose is 4–12 mg daily, commonly taken as natural astaxanthin from haematococcus pluvialis microalgae. This profile indexes 19 sources.
The bottom line
Evidence rating moderate. Most-documented uses: skin protection (uv), eye health, cardiovascular health. 19 sources indexed (2008–2024), with 0 interaction records on file.
How it works, mechanistically.
Core mechanism
Spans the entire cell membrane bilayer (unique among antioxidants), protecting both inner and outer membrane surfaces simultaneously. Quenches singlet oxygen 6,000x more effectively than vitamin C (specific lab assay, not general antioxidant potency). Does NOT become a pro-oxidant at high concentrations (unlike beta-carotene). Inhibits NF-κB and COX-2.15
Dosing & protocol.
Fat-soluble; take with fatty meal for absorption. Natural form is far superior to synthetic.7,1
What it actually costs.
Real-world pricing across three quality tiers. Assumes Natural Astaxanthin.
Assumes 4-12 mg/day. Vendor basis: NOW/iHerb, Vitacost, Life Extension, and Amazon marketplace; higher-dose natural algal softgels set the premium tier. Updated 2026-05-28.
The same dose, as food.
How much you'd eat to match a supplemental dose.
Astaxanthin varies strongly by species and feed; seafood portions are rough food comparisons.
Full safety detail.
Sources, by evidence tier.
Numbered references. Citations throughout the page link here.
Meta-analyses & systematic reviews
10- 1Effects of astaxanthin supplementation on skin health: A systematic review and meta-analysis of randomized controlled trials.PMIDIto N, Seki S, Ueda F et al. · Nutrients · 2024
Meta-analysis of RCTs showed astaxanthin supplementation significantly improved skin moisture, elasticity, and reduced wrinkles while decreasing oxidative stress markers in the skin.
- 2Effect of astaxanthin supplementation on oxidative stress and inflammatory biomarkers: A systematic review and meta-analysis.PMIDHongo N, Watanabe Y et al. · Marine Drugs · 2024
Meta-analysis demonstrated astaxanthin significantly reduced markers of oxidative stress (MDA, 8-OHdG) and inflammation (CRP, IL-6) in clinical trials.
- 3Effects of astaxanthin supplementation on lipid profile: A systematic review and meta-analysis of randomized controlled trials.PMIDSahebkar A et al. · Nutrition Metabolism and Cardiovascular Diseases · 2024
Meta-analysis of RCTs found astaxanthin supplementation significantly increased HDL cholesterol and decreased triglycerides and LDL cholesterol.
- 4Effects of Astaxanthin Supplementation on Fatigue, Motor Function and Cognition: A Meta-Analysis of Randomized Controlled TrialsPMIDLiu C, Dong X, Jia J et al. · Biological research for nursing · 2024
Liu C, Dong X, Jia J et al.. Effects of Astaxanthin Supplementation on Fatigue, Motor Function and Cognition: A Meta-Analysis of Randomized Controlled Trials. Biological research for nursing. 2024
- 5Astaxanthin and improvement of dementia: A systematic review of current clinical trialsPMIDUtomo NP, Pinzon RT, Latumahina PK et al. · Cerebral circulation - cognition and behavior · 2024
Utomo NP, Pinzon RT, Latumahina PK et al.. Astaxanthin and improvement of dementia: A systematic review of current clinical trials. Cerebral circulation - cognition and behavior. 2024
- 6Effect of astaxanthin supplementation on female fertility and reproductive outcomes: a systematic review and meta-analysis of clinical and animal studiesPMIDMaleki-Hajiagha A, Shafie A, Maajani K et al. · Journal of ovarian research · 2024
Maleki-Hajiagha A, Shafie A, Maajani K et al.. Effect of astaxanthin supplementation on female fertility and reproductive outcomes: a systematic review and meta-analysis of clinical and animal studies. Journal of ovarian research. 2024
- 7Astaxanthin supplementation mildly reduced oxidative stress and inflammation biomarkers: a systematic review and meta-analysis of randomized controlled trialsPMIDAziz N et al. · Nutr Res Rev · 2022
Meta-analysis of 12 RCTs (380 participants) found astaxanthin significantly reduced blood malondialdehyde (MDA) concentration; high dose (>=20 mg/day) showed significant antioxidant effect.
- 8Astaxanthin Influence on Health Outcomes of Adults at Risk of Metabolic Syndrome: A Systematic Review and Meta-AnalysisPMIDLeung LY, Chan SM, Tam HL et al. · Nutrients · 2022
Leung LY, Chan SM, Tam HL et al.. Astaxanthin Influence on Health Outcomes of Adults at Risk of Metabolic Syndrome: A Systematic Review and Meta-Analysis. Nutrients. 2022
- 9Systematic Review and Meta-Analysis on the Effects of Astaxanthin on Human Skin AgeingPMIDDavinelli S et al. · Nutrients · 2021
Meta-analysis of 11 studies found oral astaxanthin significantly improved wrinkle parameters and skin moisture compared to placebo over 16 weeks.
- 10Effects of astaxanthin in animal models of obesity-associated diseases: A systematic review and meta-analysisPMIDRadice RP, Limongi AR, Viviano E et al. · Free radical biology & medicine · 2021
Radice RP, Limongi AR, Viviano E et al.. Effects of astaxanthin in animal models of obesity-associated diseases: A systematic review and meta-analysis. Free radical biology & medicine. 2021
Randomized controlled trials
2- 11Asthaxanthin Improves Aerobic Exercise Recovery Without Affecting Heat Tolerance in HumansPMIDBrown DR et al. · Front Sports Act Living · 2021
In a double-blind placebo-controlled trial, astaxanthin supplementation significantly diminished rise in blood lactate during maximal oxygen uptake testing and improved exercise recovery.
- 12Astaxanthin decreased oxidative stress and inflammation and enhanced immune response in humansSource linkedPMIDPark JS, Chyun JH, Kim YK et al. · Nutr Metab · 2010
Reviews & position papers
4- 13Therapeutic uses of natural astaxanthin: An evidence-based review focused on human clinical trialsPMIDDonoso A et al. · Pharmacol Res · 2021
Eleven clinical studies identified, including six RCTs, demonstrating benefits for skin, cardiovascular, and metabolic health with antioxidant ORAC 100-500 times higher than alpha-tocopherol.
- 14Antioxidant and anti-inflammatory mechanisms of action of astaxanthin in cardiovascular diseases (Review)PMIDKohandel Z et al. · Biomed Rep · 2021
Astaxanthin suppresses ROS-mediated activation of MAPK and NF-kB, inhibits COX-2 expression, blocks nuclear translocation of NF-kB p65 and IkB-alpha degradation.
- 15Astaxanthin in Skin Health, Repair, and Disease: A Comprehensive ReviewPMIDDavinelli S et al. · Nutrients · 2018
Astaxanthin spans the entire cell membrane bilayer (unique among antioxidants), protecting both inner and outer membrane surfaces simultaneously, with exceptional photoprotective effects.
- 16Astaxanthin in cardiovascular health and diseaseSource linkedPMIDFassett RG, Coombes JS · Molecules · 2012
Mechanistic & preclinical
1- 17Astaxanthin improves muscle lipid metabolism in exercise via inhibitory effect of oxidative CPT I modificationSource linkedPMIDAoi W, Naito Y, Takanami Y et al. · Biochemical and biophysical research communications · 2008
Reference material
2- 18Hecht KA, Marwah M, Wood V et al.. Astaxanthin (AstaReal(®)) Improved Acute and Chronic Digital Eye Strain in Children: A Randomized Double-Blind Placebo-Controlled Trial. Advances in therapy. 2025Source linkedPMID
- 19Alugoju P, Krishna Swamy VKD, Anthikapalli NVA et al.. Health benefits of astaxanthin against age-related diseases of multiple organs: A comprehensive review. Critical reviews in food science and nutrition. 2023Source linkedPMID
Common questions.
Quick answers about Astaxanthin, drawn from the data on this page.
What is Astaxanthin?
The most powerful carotenoid antioxidant, 6,000x more effective than vitamin C at quenching singlet oxygen (a specific lab assay, not general potency). Gives salmon and flamingos their pink color. Exceptional for skin, eye, and cardiovascular protection.
What is Astaxanthin used for?
Commonly cited benefits of Astaxanthin include: Skin protection (UV); Eye health; Cardiovascular health; Exercise recovery; Anti-inflammatory. NutriStack rates the overall evidence as moderate.
What is a typical dose of Astaxanthin?
A typical adult dose of Astaxanthin is 4–12 mg daily. The commonly recommended form is Natural astaxanthin from Haematococcus pluvialis microalgae. These are general ranges, not personalized advice; confirm the right dose with a clinician.
What are the side effects of Astaxanthin?
Reported side effects include orange-tinted skin at very high doses, mild gi upset. This is educational information; check with a healthcare professional before use.
How strong is the evidence for Astaxanthin?
NutriStack rates this as Moderate, meaning several aligned RCTs or one large RCT plus supporting reviews. Full tier criteria are at https://nutristackapp.com/methodology/evidence-tiers.
Use this with your stack
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