Astaxanthin for Skin: What Oral Trials Show for Moisture, Elasticity, Wrinkles and UV
Start with our pillar guide: Collagen Supplements for Skin: What the Trials Show and Who Funded Them, or browse all Collagen & Oral Peptides articles.
Astaxanthin for skin has limited but real evidence. A 2021 meta-analysis of randomized trials found oral astaxanthin improved skin moisture and elasticity compared with placebo, but its effect on wrinkle depth was not statistically significant. Most trials were small, enrolled healthy Japanese women and were often commercially funded. Evidence: Limited.
Astaxanthin is sold as a "beauty-from-within" capsule, much like collagen. It isn't a peptide, though. It's a carotenoid pigment. If you're comparing oral options, our guide to collagen supplements for skin covers that category with the same evidence rules.
Key takeaways
- A 2021 meta-analysis of 9 randomized oral trials found better moisture (SMD 0.53, p = 0.03) and elasticity (SMD 0.77, p = 0.009) vs placebo, but no significant drop in wrinkle depth (SMD -0.26, p = 0.11) (Zhou et al., 2021).
- A 2021 systematic review of 11 clinical studies found most were small, done in healthy Japanese women and often commercially funded (Ng et al., 2021).
- In a 16-week trial of 65 women sponsored by Fuji Chemical Industries, wrinkle and moisture measures worsened on placebo and held steady on astaxanthin (Tominaga et al., 2017).
- The same systematic review found some support for 3 to 6 mg/day and no serious adverse events (Ng et al., 2021).
- Topical astaxanthin is hard to formulate because of poor water solubility and chemical instability (Lima et al., 2021).
Does astaxanthin for skin actually work?
Astaxanthin for skin shows modest benefits for moisture and elasticity in pooled trials, but not a clear effect on wrinkles. The research base is small and leans on industry-funded studies.
The 2021 meta-analysis searched 3 databases and found 11 studies: 9 randomized controlled trials of oral astaxanthin and 2 open-label studies of topical or combined use (Zhou et al., 2021). The authors declared no conflicts of interest. The abstract does not report total participants or trial lengths.
A separate 2021 systematic review also found 11 clinical studies, 6 of them randomized, double-blind and placebo-controlled (Ng et al., 2021). It concluded there is "some clinical data" supporting benefits, "especially for photoaged skin." Its funding was not reported in the abstract. Evidence: Limited.
What is astaxanthin?
Astaxanthin is a xanthophyll carotenoid, a fat-soluble pigment related to beta-carotene. It's made by some bacteria, yeasts and microalgae (Davinelli et al., 2018).
Commercial astaxanthin has traditionally been made by chemical synthesis, and the microalga Haematococcus pluvialis is described as the most promising biological source (Davinelli et al., 2018). Natural astaxanthin costs more and accounts for "only a 1% share" of astaxanthin on the global market (Kumar et al., 2022). That review says natural astaxanthin reduces oxidative stress more than synthetic, but no skin trial in our sources compares the two.
You'll often see astaxanthin called a "super antioxidant." That comes from a lab test called ORAC (oxygen radical absorbance capacity), where it scored 100 to 500 times higher than vitamin E (alpha-tocopherol) (Donoso et al., 2021). A test-tube score doesn't tell you what a capsule does to your face. Evidence: Lab / animal only for the antioxidant ranking.
What do trials show for astaxanthin for skin moisture, elasticity and wrinkles?
Pooled trials show better moisture and elasticity than placebo, but the wrinkle-depth result wasn't significant. The meta-analysis's own conclusion says astaxanthin "reduces wrinkles," which its numbers don't support.
SMD (standardized mean difference) is an effect size where 0 means no difference from placebo. Positive values favor astaxanthin for moisture and elasticity; for wrinkle depth, a negative value would favor it.
Show data table
| Skin measure | SMD |
|---|---|
| Moisture (p = 0.03, significant) | 0.53SMD (0 = no difference from placebo) |
| Elasticity (p = 0.009, significant) | 0.77SMD (0 = no difference from placebo) |
| Wrinkle depth (p = 0.11, not significant) | -0.26SMD (0 = no difference from placebo) |
The elasticity result had high heterogeneity (I² = 75%), meaning the trials disagreed a lot on size of effect. Moisture was moderate (I² = 52%), and wrinkles were consistent (I² = 0%) but too small to be significant (Zhou et al., 2021).
| Zhou et al. 2021 | 9 RCTs + 2 open-label studies (total participants not in abstract) | Not reported in abstract | Oral, topical or both | Better moisture and elasticity; wrinkle depth not significant |
| Ng et al. 2021 | 11 studies (6 double-blind RCTs) | Not reported in abstract | Some support for 3 to 6 mg/day | Improved texture, wrinkles and moisture in many RCTs; no serious adverse events |
| Tominaga et al. 2017 | 65 healthy women | 16 weeks | 6 mg or 12 mg/day vs placebo | Placebo worsened; astaxanthin groups showed no significant change |
Zhou et al. 2021
Result: Better moisture and elasticity; wrinkle depth not significant
Systematic review and meta-analysis with Cochrane risk-of-bias assessment. Authors declared no conflicts of interest.
Ng et al. 2021
Result: Improved texture, wrinkles and moisture in many RCTs; no serious adverse events
Systematic review. Flags small samples, healthy Japanese women and commercial funding. Review funding not reported in abstract.
Tominaga et al. 2017
Result: Placebo worsened; astaxanthin groups showed no significant change
Placebo-controlled study in Japan, August to December. Sponsored by Fuji Chemical Industries. Registered as UMIN000018550.
No large trial outside Japan appears in our sources.
The 16-week Tominaga trial shows what "works" often means here. Wrinkle parameters and skin moisture significantly worsened in the placebo group, while the astaxanthin groups didn't change significantly (Tominaga et al., 2017). It ran from August to December, when drier, changing conditions stress skin. So the result is "held steady," not "improved." Evidence: Limited for moisture and elasticity; wrinkle depth not significant.
Does astaxanthin protect skin from sun damage?
Possibly, but the human evidence is one line in a review, and the detailed work is in cells and mice. No study in our sources tests astaxanthin as a replacement for sunscreen.
The 2021 systematic review says astaxanthin "appeared to protect against UV-induced skin damage" in clinical studies, without giving numbers in the abstract (Ng et al., 2021). The rest is preclinical:
- Human skin cells: Astaxanthin mainly blocked UVB-triggered release of inflammatory signals (IL-1α and GM-CSF) from keratinocytes, and reduced enzymes linked to wrinkling in UVA-exposed fibroblasts (Nakajima et al., 2016). Authors declared no competing interests.
- Cells, combination: A ginsenoside Rg2 plus astaxanthin mix lowered UVB DNA damage markers and raised a collagen gene (COL1A1) in HaCaT keratinocytes (Chung et al., 2018). Funding not reported in the abstract.
- Mice, combination: A soy plus Haematococcus extract mix (1:2) reduced UVB-induced wrinkling in hairless mice (Shin et al., 2017). Authors declared no conflict of interest.
The last 2 tested mixtures, so they can't isolate astaxanthin. Daily sunscreen remains standard dermatology advice; that's clinic convention, not something these studies tested. See how much more SPF 50 protects for choosing one. Evidence: Lab / animal only.
Who funded the astaxanthin for skin research?
Much of it was funded by companies with a commercial interest. The 2021 systematic review states that "many of the studies were also funded by commercial entities," which the authors found "difficult to account for" (Ng et al., 2021).
The 16-week trial of 65 women was "financially sponsored by Fuji Chemical Industries Co., Ltd." (Tominaga et al., 2017). The meta-analysis authors declared no conflicts, but they pooled trials whose own funding isn't listed in the abstract (Zhou et al., 2021). Industry funding doesn't make a result wrong, but it's a reason to want independent replication. Evidence: Limited.
How much astaxanthin did skin studies use, and for how long?
Studies mostly used 3 to 6 mg a day, and one trial tested up to 12 mg for 16 weeks. These are study doses, not a recommendation.
The systematic review found support "in the range of 3 to 6 mg/d" (Ng et al., 2021). In the Tominaga trial, only the 12 mg group avoided a significant rise in IL-1α, an inflammation marker, in the outer skin layer; the 6 mg and placebo groups both rose (Tominaga et al., 2017). A 2023 review of 14 skin supplements found no clear consensus on effective doses (Januszewski et al., 2023). Evidence: Limited.
Is astaxanthin safe to take?
Short-term trials reported no serious adverse events, but long-term safety hasn't been studied well.
No serious adverse events appeared in any study in the 2021 systematic review (Ng et al., 2021). A 2022 review notes risks or inadequate research on long-term consumption (Kumar et al., 2022). We found no data on pregnancy, breastfeeding or drug interactions, so ask a doctor or pharmacist before starting it. Evidence: Limited.
Do topical astaxanthin serums work?
We don't know. Only open-label studies have tested topical astaxanthin, and the molecule is hard to deliver.
The meta-analysis found 2 open-label studies suggesting "slightly protective effects" of topical and oral-topical use, with no placebo comparison (Zhou et al., 2021). A 2021 review says poor water solubility and chemical instability make formulation "a major challenge." Liposomes, emulsions and films may help, but further studies are needed (Lima et al., 2021). For topicals with more trial data, see what peptides do for your skin. Evidence: Early / preliminary.
How does astaxanthin compare with collagen and other oral skin supplements?
No trial in our sources compares astaxanthin head to head with collagen or any other supplement.
Astaxanthin is one of 14 compounds a 2023 review listed with "possible effects" on skin, alongside vitamins C, D and E, omega-3 and others (Januszewski et al., 2023). For other oral options, see collagen supplements, collagen and vitamin C and glutathione for skin. Evidence: Limited.
Where the evidence stops
- Wrinkles: pooled data didn't show a significant effect.
- Who was studied: mostly healthy Japanese women; no large trial elsewhere in our sources.
- Funding: many trials were commercially funded.
- UV protection: detailed evidence is cell and mouse work, partly using combinations.
- Topicals: open-label studies only.
- Long-term safety and interactions: no data.
FAQ
Is astaxanthin good for your skin?
Small trials suggest it may help with dryness and firmness. A 2021 meta-analysis of randomized trials found oral astaxanthin improved skin moisture and elasticity compared with placebo. Most studies were small, were done in healthy Japanese women and were often commercially funded.
Does astaxanthin reduce wrinkles?
Not clearly. In the 2021 meta-analysis, the drop in wrinkle depth was not statistically significant (p = 0.11). In one 16-week trial, wrinkle measures worsened in the placebo group and did not change significantly in the astaxanthin groups, which suggests holding steady rather than improving.
Does astaxanthin protect against sun damage?
A 2021 systematic review said astaxanthin appeared to protect against UV-induced skin damage, but most of the mechanism work comes from cell and mouse studies. No study shows it can replace sunscreen.
How much astaxanthin was used in skin studies?
A systematic review found some support for 3 to 6 mg a day, and one 16-week trial tested 6 mg and 12 mg a day. These are study doses, not a recommendation, and a 2023 review notes there is no clear consensus on dosing.
Who funded the astaxanthin skin studies?
Often, companies with a commercial interest. The 16-week trial of 65 women was sponsored by Fuji Chemical Industries, and a systematic review noted that many astaxanthin skin studies were commercially funded.
Is astaxanthin safe?
No serious adverse events were reported in the clinical studies covered by a 2021 systematic review. Research on long-term use is limited, and we found no data on pregnancy, breastfeeding or drug interactions, so ask a doctor or pharmacist before starting it.
Does topical astaxanthin work?
The evidence is thin. Only open-label studies have tested topical or combined oral-topical astaxanthin, with slightly protective results, and astaxanthin is unstable and poorly soluble in water, which makes it hard to formulate.
Is astaxanthin a peptide like collagen?
No. Astaxanthin is a carotenoid, a reddish-orange pigment made by microalgae such as Haematococcus pluvialis, while collagen supplements are protein fragments. It is grouped with oral skin supplements, not with peptides.
References
- Zhou X, et al. Systematic Review and Meta-Analysis on the Effects of Astaxanthin on Human Skin Ageing. Nutrients. 2021. Meta-analysis of 9 RCTs plus 2 open-label studies; authors declared no conflicts. https://pubmed.ncbi.nlm.nih.gov/34578794/
- Ng QX, et al. Effects of Astaxanthin Supplementation on Skin Health: A Systematic Review of Clinical Studies. J Diet Suppl. 2021. Systematic review, 11 studies (6 double-blind RCTs); funding not reported in abstract. https://pubmed.ncbi.nlm.nih.gov/32202443/
- Tominaga K, et al. Protective effects of astaxanthin on skin deterioration. J Clin Biochem Nutr. 2017. Placebo-controlled study, n=65 healthy women, 16 weeks, plus cell work; sponsored by Fuji Chemical Industries. https://pubmed.ncbi.nlm.nih.gov/28751807/
- Davinelli S, et al. Astaxanthin in Skin Health, Repair, and Disease: A Comprehensive Review. Nutrients. 2018. Review; authors declared no conflicts. https://pubmed.ncbi.nlm.nih.gov/29690549/
- Kumar S, et al. Astaxanthin: A super antioxidant from microalgae and its therapeutic potential. J Basic Microbiol. 2022. Review; funding not reported in abstract. https://pubmed.ncbi.nlm.nih.gov/34817092/
- Donoso A, et al. "Therapeutic uses of natural astaxanthin: An evidence-based review focused on human clinical trials". Pharmacol Res. 2021. Review; non-US government support. https://pubmed.ncbi.nlm.nih.gov/33549728/
- Nakajima H, et al. The Inhibitory Effects of Anti-Oxidants on Ultraviolet-Induced Up-Regulation of the Wrinkling-Inducing Enzyme Neutral Endopeptidase in Human Fibroblasts. PLoS One. 2016. In vitro human cell study; authors declared no competing interests. Author affiliation: Toyo Beauty Co. R&D. https://pubmed.ncbi.nlm.nih.gov/27648570/
- Shin J, et al. A Combination of Soybean and Haematococcus Extract Alleviates Ultraviolet B-Induced Photoaging. Int J Mol Sci. 2017. Hairless mice and human fibroblasts, combination extract; authors declared no conflicts. Authors affiliated with Pulmuone Co. (food company). https://pubmed.ncbi.nlm.nih.gov/28327532/
- Chung YH, et al. Protective effects of ginsenoside Rg2 and astaxanthin mixture against UVB-induced DNA damage. Anim Cells Syst (Seoul). 2018. In vitro HaCaT cell study, combination; funding not reported in abstract. https://pubmed.ncbi.nlm.nih.gov/30533262/
- Lima SGM, et al. Astaxanthin Delivery Systems for Skin Application: A Review. Mar Drugs. 2021. Review; authors declared no conflicts. https://pubmed.ncbi.nlm.nih.gov/34564173/
- Januszewski J, et al. Nutritional Supplements for Skin Health-A Review of What Should Be Chosen and Why. Medicina (Kaunas). 2023. Narrative review, 238 articles; authors declared no conflicts. https://pubmed.ncbi.nlm.nih.gov/38256329/
Disclosure: This article is for general information only. It is not medical advice. Peptide Skincare has no affiliate links in this article and received no payment from any manufacturer mentioned. Astaxanthin supplements are not approved treatments for skin aging; ask a clinician before using any supplement if you are pregnant, breastfeeding, take medicines or have a health condition.