Cyclists use astaxanthin supplements hoping to improve endurance, burn more fat during long rides, reduce muscle damage and finish faster. A few human studies suggest astaxanthin may improve cycling time-trial performance or help riders last longer before exhaustion, but other research has found no benefit at all. This review looks at the human evidence on astaxanthin for cycling, explains what the positive studies actually found, points out the weaknesses in the research and helps you decide whether this supplement is worth trying.
Quick Answer: Does Astaxanthin Help Cycling Performance?
Astaxanthin may provide a small cycling performance benefit, but the evidence is inconsistent. Several small studies found faster cycling times or longer time to exhaustion, while a larger trial found no improvement in cycling performance or fat burning.
A newer study in women suggests astaxanthin may increase reliance on fat during submaximal cycling, but it did not show that the women cycled faster or longer.
Overall, astaxanthin for cycling looks promising but remains unproven. The research involves small groups, different doses and cycling tests, and mostly young men.
Watch My Astaxanthin Cycling Video
I previously reviewed the research on astaxanthin for cycling performance in this video. Since it was published, additional studies have appeared, so the article below includes newer evidence and my updated conclusions.
Prefer video? Watch my full astaxanthin for cycling review on YouTube.
What Is Astaxanthin?
Astaxanthin is a red-orange carotenoid found in algae and marine animals. It contributes to the color of salmon, trout, shrimp, lobster and some other seafood.
Most natural astaxanthin supplements come from the microalga Haematococcus pluvialis. Astaxanthin dissolves in fat and can become incorporated into cell membranes, including mitochondrial membranes.
Companies frequently market astaxanthin as a powerful antioxidant. That description is accurate in a laboratory sense, but antioxidant strength measured in a test tube does not prove that a supplement improves endurance or athletic performance in people.
Researchers have proposed several ways astaxanthin might help cyclists:
- It may protect mitochondrial membranes from oxidative damage.
- It may influence how fatty acids enter mitochondria.
- It may help preserve muscle glycogen by increasing fat use.
- It may reduce exercise-related muscle damage.
- It may support the body’s own antioxidant defenses.
Most of the detailed evidence for these mechanisms comes from cell and animal research. Human exercise studies have not consistently confirmed them. A critical review concluded that findings in exercising humans were mixed and that more rigorous studies were needed before drawing firm conclusions.
Astaxanthin for Cycling Performance: What Do the Human Studies Show?
Here are the main cycling studies and what each one found.
Astaxanthin Improved a 20-Kilometer Cycling Time Trial in a Small Study
In one of the earliest human cycling trials, researchers randomly assigned competitive male cyclists to take either 4 mg of astaxanthin per day or a placebo for 28 days.
After a two-hour pre-exhaustion ride, the cyclists completed a 20-kilometer time trial.
The astaxanthin group:
- Finished the time trial 121 seconds faster than at baseline.
- Increased average power output by about 20 watts.
- Improved its time by approximately 5.1%.
The placebo group improved by only 19 seconds and increased power by about 1.6 watts.
Those numbers sound impressive, but the study has several serious weaknesses.
- Researchers initially randomized 21 cyclists, yet only 14 completed the full protocol. That left just seven people in the astaxanthin group and seven in the placebo group. Some participants withdrew because they could not finish the demanding test.
- The researchers also found no improvement in fat oxidation, carbohydrate oxidation, or blood markers of fuel use. They could not explain why performance improved.
This study suggests a possible benefit, but seven people receiving astaxanthin is far too small a group to provide a dependable answer.
Astaxanthin Did Not Improve Cycling Performance or Fat Burning
A larger study produced the opposite result.
Thirty-two well-trained male cyclists and triathletes took either:
- 20 mg of astaxanthin per day, or
- A placebo
They used the supplement for four weeks.
The cyclists then completed 60 minutes of steady cycling followed by a time trial lasting about one hour.
Astaxanthin significantly raised astaxanthin levels in the blood, showing that participants absorbed the supplement. Nevertheless, it did not:
- Increase whole-body fat oxidation
- Improve antioxidant capacity
- Improve average power
- Improve cycling time-trial performance
Fat oxidation actually declined slightly in both groups rather than increasing. The researchers concluded that prolonged astaxanthin supplementation did not improve fat use or endurance performance in trained cyclists.
This trial included more cyclists than the 2011 study, used familiarization tests and standardized the participants’ diets. It also reported receiving no study funding, although BioReal Sweden supplied the astaxanthin and placebo capsules
Of the earlier trials, this is one of the strongest pieces of evidence against a meaningful astaxanthin cycling benefit.
Astaxanthin Slightly Improved 40-Kilometer Cycling Performance
A randomized trial tested 12 mg of astaxanthin per day for seven days in 12 recreationally trained male cyclists.
Because this was a crossover study, every cyclist completed both conditions:
- Astaxanthin
- Placebo
The average time to complete 40 kilometers was:
- 69.90 minutes with astaxanthin
- 70.76 minutes with placebo
That works out to an average improvement of 51 seconds, or approximately 1.2%. Whole-body fat oxidation was also 0.09 grams per minute higher near the end of the ride, between kilometers 39 and 40.
This result is interesting because a one-minute difference could matter in competition. However, it deserves a cautious interpretation.
The study involved only 12 men. The average performance improvement of 1.2% was close to the expected test-to-test variation of a 40-kilometer cycling time trial. The researchers acknowledged that future studies needed to measure normal performance variation within the actual group to confirm that the improvement was meaningful.
The increase in fat oxidation appeared only during the final kilometer. Astaxanthin did not consistently increase fat use throughout the entire ride.
As of possible conflicts, one researcher received external funding from AstaReal, the company that supplied the supplement, and two researchers reported professional relationships with the company. This does not invalidate the findings, but athletes should know about it.
Astaxanthin Increased Cycling Time to Exhaustion
A 2025 randomized study produced the largest performance improvement reported so far.
Ten physically active young men took:
- 28 mg of astaxanthin daily for four days
- A placebo during a separate trial
They then cycled at 75% of VO2max until exhaustion.
Average cycling time was:
- 85.4 minutes after astaxanthin
- 72.1 minutes after placebo
That is a difference of more than 13 minutes. The astaxanthin condition also produced lower levels of some markers associated with muscle damage and lipid peroxidation.
However, the study did not find that astaxanthin increased fat oxidation or changed carbohydrate use.
The performance result is notable, but it is difficult to accept at face value for several reasons.
- The study involved only 10 men. A large effect in a group this small may shrink or disappear when tested in a larger population.
- Cycling until exhaustion is not the same as a real cycling time trial. Time-to-exhaustion tests can vary according to motivation, pacing, sleep and familiarity with the test.
- The researchers measured muscle-damage markers only during and immediately after exercise. They did not track recovery for 24 to 72 hours, when creatine kinase and muscle soreness may become more informative. The authors specifically acknowledged the small sample and lack of post-exercise follow-up.
The study received university and Taiwanese government funding rather than funding from an astaxanthin company.
Study in Women: Greater Reliance on Fat, but No Performance Test
Most previous astaxanthin cycling research involved men. A 2026 randomized, double-blind study looked at 20 recreationally active women.
The women took 12 mg of astaxanthin per day for two weeks and a placebo during another two-week period. They completed a 30-minute cycling test with intensity rising from 40% to 65% of maximum power.
Astaxanthin produced a statistically lower overall respiratory exchange ratio, or RER.
That said, astaxanthin did not change:
- Heart rate
- Blood lactate
- Perceived exertion
The researchers also did not test a time trial or cycling to exhaustion. Therefore, the study does not show that astaxanthin helped women cycle faster, longer or ride the bike more comfortably. It only suggests a modest shift in the fuel mixture used during submaximal exercise.
Astaxanthin Cycling Studies at a Glance
| Study | Participants | Astaxanthin dose | Duration | Cycling test | Main result |
|---|---|---|---|---|---|
| Earnest, 2011 | 14 male cyclists completed | 4 mg/day | 28 days | Two-hour ride plus 20 km time trial | Astaxanthin group improved by 121 seconds; no increase in fat oxidation |
| Res, 2013 | 32 trained male cyclists/triathletes | 20 mg/day | 4 weeks | 60-minute ride plus approximately one-hour time trial | No improvement in fat oxidation or performance |
| Brown, 2021 | 12 recreationally trained male cyclists | 12 mg/day | 7 days | 40 km time trial | 51 seconds faster; more fat oxidation only near the finish |
| Tsao, 2025 | 10 active young men | 28 mg/day | 4 days | Cycling at 75% VO2max until exhaustion | About 13 minutes longer; no change in fuel use |
| Barker, 2026 | 20 recreationally active women | 12 mg/day | 2 weeks | 30-minute submaximal cycling test | Lower overall RER; cycling performance not tested |
The studies do not reveal a clear dose-response relationship. The largest dose did not consistently produce the best or most believable result, and the 20 mg dose failed to improve performance in the largest trial.
Does Astaxanthin Help Cyclists Burn More Fat?
Possibly, but the evidence is inconsistent.
The 2021 cycling trial found greater fat oxidation only during the final kilometer of a 40-kilometer time trial. The 2026 study in women found a lower overall RER during submaximal cycling, which points toward greater use of fat as fuel.
In contrast:
- The 2011 study found no treatment effect on fat oxidation.
- The 2013 study found no increase in whole-body fat oxidation.
- The 2025 study found no difference in substrate use.
The 2025 researchers noted that previous human trials used doses ranging from 4 to 20 mg per day and produced conflicting results for both fat oxidation and performance.
There is also an important distinction between burning more fat during a ride and losing more body fat.
A temporary change in fuel use does not prove that a supplement causes weight loss. Body-fat loss depends mainly on energy balance over time. None of these cycling trials showed that astaxanthin reduced body weight, waist size or body-fat percentage.
Does Astaxanthin Improve Cycling Endurance?
The research is split.
Three small studies reported a performance improvement:
- A faster 20-kilometer time trial
- A faster 40-kilometer time trial
- A longer time to exhaustion
One larger study found no improvement at all.
Even the positive trials do not agree on why astaxanthin might work. Two reported performance benefits without increased fat oxidation. Another found more fat oxidation only at the very end of a ride.
A 2024 review proposed that astaxanthin might protect mitochondria and support adaptations to endurance training. However, much of that argument still rests on animal or laboratory research rather than direct measurements in cyclists.
At this point, astaxanthin cannot be placed in the same evidence category as carbohydrate intake, caffeine, creatine for certain cycling efforts or nitrate-rich beetroot products.
Can Astaxanthin Reduce Muscle Damage and Improve Cycling Recovery?
The evidence for cycling recovery is even less certain than the evidence for performance.
The 2025 cycling trial found lower creatine kinase and lactate dehydrogenase values after astaxanthin. It also found lower malondialdehyde, a marker associated with lipid peroxidation.
These results may indicate less exercise-related cellular stress, but they do not prove faster functional recovery.
The researchers did not show that astaxanthin:
- Reduced next-day muscle soreness
- Restored cycling power faster
- Improved performance in a second ride
- Reduced recovery time between training sessions
Changes in blood biomarkers do not always translate into a noticeable benefit for the cyclist.
Problems With the Research on Astaxanthin for Cycling
The studies are very small
The positive trials involved 7, 10 or 12 people receiving or completing the astaxanthin condition. Small studies are more vulnerable to chance findings and unusually strong responses from a few participants.
Most participants were young men
Until the 2026 trial, nearly all of the cycling research involved men. The female trial measured fuel use but did not test performance.
We do not know whether the results apply equally to:
- Women cyclists
- Older adults
- Beginners
- Masters athletes
- Elite cyclists
- People cycling mainly for health or weight control
The studies used different tests
Researchers tested astaxanthin with:
- A 20-kilometer time trial after two hours of cycling
- A 40-kilometer time trial
- A one-hour performance test
- Cycling until exhaustion
- A 30-minute staged submaximal ride
These tests measure different aspects of endurance. The lack of a standardized protocol makes the studies difficult to compare.
The doses and durations vary widely
Researchers used doses ranging from 4 to 28 mg per day for periods lasting 4 days to 4 weeks.
No one has established the best astaxanthin dose for cycling performance. More is not necessarily better. The 20 mg study was negative, while some smaller positive trials used 4 or 12 mg.
Some positive studies had industry connections
The 2021 trial disclosed research funding and professional relationships involving AstaReal. The company also supplied the active supplement and placebo.
Industry involvement does not automatically make a study unreliable.
Time to exhaustion can exaggerate apparent benefits
A cyclist’s time to exhaustion may vary more than performance in a set-distance time trial. Motivation and willingness to tolerate discomfort can influence when someone stops.
That matters when a study involving only 10 people reports a 13-minute difference.
Researchers often measure many outcomes
The trials measured combinations of performance, power, heart rate, RER, fat oxidation, carbohydrate oxidation, lactate, glucose, triglycerides, inflammation, muscle-damage markers, oxidative-stress markers and mood.
The more comparisons researchers make, the greater the chance that at least one will appear statistically significant. This does not mean the reported findings are false, but isolated positive results need replication.
A lower RER does not automatically mean better cycling performance
Using a greater proportion of fat can theoretically preserve glycogen during long rides. However, cyclists need carbohydrate to sustain higher exercise intensities.
More fat oxidation is not always better. The important question is whether the metabolic change allows cyclists to produce more power or finish faster. The 2026 female study did not answer that question.
How Much Astaxanthin Did the Positive Cycling Studies Use?
The positive performance studies used:
- 4 mg daily for 28 days
- 12 mg daily for 7 days
- 28 mg daily for 4 days
The female metabolism study used:
- 12 mg daily for 14 days
This spread does not provide a reliable “best dose” that would be best for everyone.
For an average cyclist who decides to experiment, 6 to 12 mg per day is a more conservative range than copying the 28 mg dose from one very small study. Twelve milligrams also matches the dose used in the 40-kilometer cycling trial and the 2026 female trial.
There is no convincing reason for recreational cyclists to assume that 20 to 28 mg will work better.
When Should Cyclists Take Astaxanthin?
Astaxanthin is fat-soluble, so taking it with a meal that contains some fat makes more sense than taking it on an empty stomach.
Do not treat it like caffeine or a pre-workout stimulant. The cycling research used daily supplementation for several days or weeks. None of the studies showed that taking one astaxanthin capsule shortly before a ride provides an immediate boost.
A practical approach would be to take the same daily dose with breakfast or another meal rather than trying to time it precisely before cycling.
What to Look for in an Astaxanthin Supplement for Cycling
Choose natural astaxanthin from Haematococcus pluvialis
Most human exercise studies used astaxanthin derived from the microalga Haematococcus pluvialis. Look for the source on the Supplement Facts panel or ingredient list. A label that merely says “astaxanthin” provides less information.
Check the actual astaxanthin amount
Make sure the Supplement Facts label lists the amount of astaxanthin per serving, not merely the weight of an algae extract.
For example, an 80 mg algae extract standardized to 5% astaxanthin provides only 4 mg of astaxanthin. That is the type of extract used in the 2011 cycling study.
Consider an oil-based softgel
Astaxanthin dissolves in fat. Many products combine it with olive oil, safflower oil or another carrier oil in a softgel.
An oil-based product is reasonable, although no cycling trial so far has shown that one carrier oil improves performance more than another.
Avoid proprietary performance blends
A product that combines astaxanthin with caffeine, beetroot, amino acids or other ingredients makes it impossible to know which ingredient is helping or causing side effects. A single-ingredient product is easier to evaluate.
Look for legitimate third-party certification
Cyclists who compete under anti-doping rules should consider products carrying certification such as NSF Certified for Sport.
NSF states that its sports program tests products for banned substances, verifies label contents, reviews manufacturing and conducts ongoing monitoring. Certification does not prove that astaxanthin improves cycling performance. It provides additional assurance about identity and contamination.
Do not assume that phrases such as “lab tested,” “pharmaceutical grade” or “GMP quality” mean the finished product has undergone meaningful independent testing.
Do not mistake a certificate of analysis for proof of effectiveness
A legitimate certificate of analysis may help verify purity, potency and contaminants. It does not prove that the supplement improves cycling performance.
The FDA does not routinely test dietary supplements before companies sell them.
Is Astaxanthin Safe for Cyclists? Side Effects & Concerns.
Astaxanthin appeared to be well tolerated in the cycling studies, but most trials were short and involved relatively few people.
Reported or plausible side effects include:
- Changes in stool color
- More frequent bowel movements
- Stomach discomfort
- Red or orange discoloration of stool at higher doses
The 2025 study noted that doses used in human trials generally appeared well tolerated, although larger doses may increase bowel movements or cause reddish stool.
Anyone who is pregnant, breastfeeding, has a medical condition or takes prescription medication should ask a healthcare professional before using it. Extra caution makes sense for people taking medications that affect blood pressure, blood sugar, immune function or blood clotting because human interaction data remain limited.
Cyclists should also test any new supplement during training, not for the first time on race day.
Astaxanthin From Food vs. Supplements
Salmon, trout, shrimp, crab and lobster provide astaxanthin, although the amount varies by species, diet and preparation.
Food is unlikely to supply the same daily amounts used in most supplement trials without eating substantial quantities. However, seafood also provides protein, omega-3 fats and other nutrients that an isolated astaxanthin capsule does not.
Eating salmon is good nutrition. It should not be presented as a proven substitute for the exact astaxanthin doses used in cycling studies.
Is Astaxanthin Worth Trying for Cycling?
Astaxanthin may be worth a personal trial for a cyclist who:
- Already has training, sleep, hydration and carbohydrate intake in order
- Understands that the evidence is uncertain
- Can afford the supplement without sacrificing more useful nutrition
- Uses a third-party-tested product
- Tracks performance objectively
It makes less sense for someone looking for a noticeable pre-workout boost or a shortcut around poor training and fueling.
Cyclists who test it could record performance on the same route or indoor cycling protocol before and after several weeks. Keep time of day, nutrition, caffeine, sleep, tire pressure and training load as consistent as possible.
Even then, normal variation and expectation effects can make a supplement appear more effective than it is.
Bottom Line: Does Astaxanthin Improve Cycling Performance?
Astaxanthin has produced enough positive research to remain interesting, but not enough to call it a proven cycling performance supplement.
Two small time-trial studies reported improvements of roughly 1% to 5%. Another small trial found a substantial increase in time to exhaustion. A larger trial in well-trained cyclists found no improvement in performance or fat oxidation.
The newest female study suggests that astaxanthin may shift submaximal fuel use toward fat, but it did not show better cycling performance.
My interpretation is that astaxanthin might provide a small benefit for some cyclists, but the current evidence is inconsistent and probably looks stronger than it really is because the positive studies are so small.
Cyclists should view astaxanthin as an optional experiment, not a core performance supplement.
Frequently Asked Questions
Does astaxanthin make you cycle faster?
Possibly, but the evidence is inconsistent. Two small studies reported faster 20- or 40-kilometer cycling time trials. A larger study involving 32 trained cyclists found no benefit.
Does astaxanthin increase fat burning during cycling?
Some studies suggest it may increase reliance on fat under specific conditions. Other trials found no effect. Using more fat during one ride also does not prove that astaxanthin causes body-fat loss.
Does astaxanthin improve VO2max?
The available cycling research does not show a reliable increase in VO2max. Most positive findings involved time-trial performance or time to exhaustion rather than improved aerobic capacity.
Can astaxanthin reduce cycling fatigue?
One small study found that men cycled longer before exhaustion after taking 28 mg per day for four days. This result needs to be repeated in a larger trial using a more competition-like cycling test.
How much astaxanthin should cyclists take?
There is no established dose for cycling performance. Studies have used 4 to 28 mg per day. A conservative experimental range is 6 to 12 mg daily, but even that dose is not guaranteed to improve performance.
Should you take astaxanthin before cycling?
The studies used daily supplementation rather than a single pre-ride dose. Astaxanthin is not a stimulant and has not been shown to provide an immediate effect when taken shortly before cycling.
How long does astaxanthin take to work for cycling?
Positive studies used it for four days, seven days or four weeks. The research does not establish a minimum effective duration.
Is astaxanthin banned in cycling?
Astaxanthin itself is not presented as a prohibited athletic substance. Competitive cyclists should still use a reputable third-party-certified product because supplements can contain undeclared or contaminated ingredients.
Is astaxanthin better than caffeine for cycling?
No evidence shows that astaxanthin works as reliably as caffeine. Caffeine has a much larger body of performance research. Astaxanthin’s effect, when present, appears smaller and less predictable.
Can astaxanthin help cyclists lose weight?
No cycling study has shown that astaxanthin causes weight loss or reduces body fat. Greater fat oxidation during part of a ride does not necessarily lead to greater fat loss over time.
Any questions?
