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Astaxanthin (Natural)
An algae-derived carotenoid antioxidant. The honest verdict: meta-analyses show small skin-aging and oxidative-stress-marker benefits, but trials are few, small, often industry-funded, and outcomes are biomarker- or cosmetic-level rather than hard clinical endpoints.
What the evidence says
Astaxanthin doesn't have enough studies with structured effect-size data yet to pool a verdict. Browse the studies below for individual findings.
Most evidence is from high-quality meta-analyses and randomised trials published 2003–2026 with a typical study size of 380 participants.
Based on 115 studies · 16 meta-analyses · 57 RCTs · 430 total participants
Confidence
High confidenceWhat the studies found
By outcome
Meta-analyses show small antioxidant and skin-aging benefits, but human trials are few, small, often industry-funded, with outcomes that are biomarker- or cosmetic-level rather than hard clinical endpoints.
60 randomised trials
every one checked individually
Every randomised or controlled trial of Astaxanthin indexed in PubMed, not a hand-picked subset. Meta-analyses and systematic reviews are deliberately excluded from this count: most of them cover many compounds at once, so counting them would inflate it.
PubMed · as of Jul 2026
11 trials ongoing or recruiting · 44 completed on ClinicalTrials.gov
2 of the completed trials have posted results
Registered trials show research momentum for Astaxanthin, not proof of effect — a registration is a plan, and posted results are sponsor-reported, not peer-reviewed. They are never counted toward the evidence rating above.
Browse these trials on ClinicalTrials.govClinicalTrials.gov · as of Oct 2026
Under EU law (Reg. 1924/2006), EFSA reviews whether a specific health claim for Astaxanthin meets the evidence standard. These are independent regulatory decisions on claims — not studies, and never counted toward the evidence score above.
Not authorised by EFSA
“Astaxanthin favourably influence on condition of cartilage”
“Astaxanthin helps to protect against free radicals and harmful factors of environment”
“Astaxanthin from Haematococcus pluvialis Supports skin structure during sun exposure. Supports healthy skin”
“Astaxanthin from Haematococcus pluvialis Supports healthy cholesterol levels. Maintains low C reactive protein levels”
“Astaxanthin from Haematococcus pluvialis Supports the eyes. Visual acuity support. Provides antioxidant support to the retina”
“Not authorised” means the specific claim wording did not meet the EU’s evidence standard — often a matter of dossier or phrasing, not proof of no effect. EFSA judges marketing claims and is kept separate from our study-based evidence score.
Source: EU Register of nutrition and health claims (European Commission / EFSA) · register snapshot Feb 2013
Astaxanthin is a red-orange carotenoid pigment found in salmon, shrimp, and microalgae, and is a potent lipophilic antioxidant.
The best-supported effects are modest: a meta-analysis (n=380) shows it lowers the oxidative-stress marker malondialdehyde versus placebo, and a skin-aging meta-analysis plus a small RCT show improved moisture, elasticity, and UV protection.
But reviewers flag that these trials are small, frequently conducted on healthy Japanese women, and often commercially funded, and the outcomes are surrogate markers or cosmetic measures rather than hard clinical endpoints.
Claims for eye fatigue, endurance, and cardiovascular benefit are not well-established in the corrected evidence.
Uniquely protects entire cell membrane
Reduces inflammatory signaling
Protects cellular powerhouses from damage
How Astaxanthin works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
Likely safe at low doses; insufficient data for high doses
A clinically important interaction between astaxanthin and each listed anticoagulant or antiplatelet medicine has not been established from the evidence supplied here. Ask a pharmacist to assess the exact supplement, medicine and other bleeding risks before use. This possible interaction has not been individually evaluated for this supplement; its likelihood and severity are unknown. If you take an anticoagulant or antiplatelet medicine, ask a pharmacist or prescriber before using this product. Do not stop or change prescribed medicines based on this notice.
Tip: Reduce dose; harmless and reversible
Tip: Take with food
Astaxanthin has an evidence score of 5/10 — moderate evidence based on 115 indexed studies, including 3 meta-analyses. An algae-derived carotenoid antioxidant. The honest verdict: meta-analyses show small skin-aging and oxidative-stress-marker benefits, but trials are few, small, often industry-funded, and outcomes are biomarker- or cosmetic-level rather than hard clinical endpoints. Representative study: PMID 35091276.
The commonly studied dose of Astaxanthin is 4-6 mg a day (the cited trial that states a daily dose used 6 mg a day). Label products go up to 12 mg, above the highest dose in the cited trials. Individual needs vary — start at the lower end of the range and adjust based on how you respond.
The best time to take Astaxanthin is with meals. Take it with food. Astaxanthin is a highly lipophilic carotenoid with virtually no absorption without co-ingested fat.
Astaxanthin is generally well-tolerated and considered safe for most healthy adults at recommended doses. Reported side effects are uncommon and include orange skin tint (very high doses), GI upset. Use caution if any of these apply to you: Allergy to algae or seafood (check source).
Collagen
Likely helpsHydrolyzed peptides that rebuild skin elasticity, reduce joint pain, and strengthen bone density — results build over 8-12 weeks.
CoQ10
Likely helpsA lipid-soluble antioxidant central to mitochondrial energy production, with the strongest trial support for fertility/IVF outcomes and heart failure.
Marine Collagen
Mostly mechanism / observationalType I collagen peptides from fish, tested in small placebo-controlled trials for skin hydration, elasticity and wrinkles, several of them on multi-ingredient products.
Berberine
Likely helpsActivates AMPK to regulate blood sugar, improve insulin sensitivity, and support lipid metabolism. Its only head-to-head trial with metformin cited here was a 36-person pilot, which does not show it can replace metformin.
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Reviewed by Dr. Baher Al Hakim · Last reviewed May 2026 · evidence from 115 studies · how we score · editorial policy
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
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