There are some active ingredients whose names sound almost mysterious. Astaxanthin is one of them. Yet, behind this somewhat scientific-sounding word lies a much more familiar image: the deep red of wild salmon, the pink hue of shrimp, the orange glow of krill, or the plumage of flamingos.
This natural pigment, widely found in the aquatic world, captivates researchers for a specific reason: its unique structure and antioxidant properties.
Sun-exposed skin, eyes strained daily, cell lipids sensitive to oxidation… astaxanthin is now being studied in several fields. But its success also comes with sometimes spectacular promises. So, what really makes it special?
Where does astaxanthin come from?
Salmon does not produce this characteristic red colour itself. It obtains it through its diet, and tracing this food chain reveals a story that begins with something much smaller than a fish or a shrimp.
Astaxanthin belongs to the carotenoid family, those natural pigments responsible for many shades of yellow, red, or orange. We know some of its relatives better: the beta-carotene in carrots, the lycopene in tomatoes, or the lutein found notably in certain green vegetables.
One question remains: who actually produces it? When talking about natural astaxanthin used in food supplements, one name often comes up: Haematococcus pluvialis. Contrary to what its association with fish and crustaceans might suggest, this microalga lives in freshwater.
When it encounters certain difficult conditions, such as intense light or a lack of nutrients, for example, it can accumulate large quantities of astaxanthin and take on an intense red colour. This natural response to stress now makes it one of the main sources of astaxanthin for food supplements.
Once cultivated, astaxanthin must still be extracted and then formulated: this choice determines part of its final quality. Depending on the processes used, extraction may notably use supercritical CO₂, a technology that allows for the production of extracts without certain conventional organic solvents. The molecule must then be protected from conditions that could degrade it, notably light and oxidation.
Why does astaxanthin interest researchers so much?
The word "antioxidant" is used everywhere today, at the risk of losing some of its meaning. To understand what is really happening with astaxanthin, we must go back to what happens in our cells.
Our bodies naturally produce free radicals as they function. They are therefore not, by definition, enemies to be eliminated: the problem arises rather when the balance shifts. UV radiation, tobacco, pollution, or even intense physical activity can increase the production of certain reactive species. When this exceeds the capacity of the body's defence systems, we speak of oxidative stress.
Discover our article on oxidative stress to understand better.
Lipids, proteins, and other cellular components can then be more exposed to oxidation phenomena. It is precisely in this environment that astaxanthin attracts attention.
The membranes surrounding our cells are rich in lipids. We can imagine them as living envelopes: thin, flexible, and dynamic, but with certain components that remain sensitive to oxidation. Astaxanthin's unique molecular structure allows it to interact with this environment: this is one of the reasons why oxidative stress and lipid oxidation occupy such an important place in the research dedicated to it.
This observation also goes far beyond a simple classification among antioxidants: all these molecules do not have the same structure or the same behaviour in the body.
6,000 times more antioxidant than vitamin C: really?
If you have ever searched for information on astaxanthin, you have probably come across this figure: it is said to be "6,000 times more antioxidant than vitamin C".
The claim is impressive. It also greatly oversimplifies reality.
The measured antioxidant power depends on the test used, the radical studied, and the experimental conditions. A result obtained in a laboratory system therefore does not allow us to conclude that a molecule will be "100 times", "1,000 times", or "6,000 times" more effective in the human body. That does not mean astaxanthin is an overhyped, ineffective antioxidant. On the contrary.
Comparing astaxanthin directly to vitamin C or vitamin E also has its limits: these molecules do not behave exactly the same way, are not consumed in the same way, and do not necessarily act on the same biological mechanisms.
Astaxanthin does not need a theoretical record. Its structure is already unique, and it is above all studies in humans that are gradually allowing us to understand what it can really offer.
Astaxanthin and skin: what do the studies show?
The skin is probably one of the areas where astaxanthin has sparked the most interest. Several clinical trials have studied different skin parameters, with encouraging results; however, they are not identical for all the criteria observed.
The skin is on the front line facing our environment. Sun, cold, wind, pollution: day after day, it must deal with factors capable of influencing its balance.
Among them, UV radiation plays an important role in premature skin ageing. It contributes to the increase of oxidative stress and the progressive alteration of different skin structures. It is in this context that astaxanthin has particularly caught the attention of researchers.
A meta-analysis grouping several clinical trials notably found significant improvements in skin hydration and skin elasticity compared to the placebo. For wrinkle depth, however, the observed difference was not statistically significant.
The data therefore point to a promising avenue on certain skin parameters, while reminding us of one essential thing: not all the studied effects have the same level of evidence yet.
Sun exposure constitutes another area of research around astaxanthin. Not because it acts as a sunscreen (it does not block UV rays and obviously does not replace a good SPF), but because researchers are looking at what happens biologically in the skin around this exposure.
UV rays promote oxidative stress and can change different cellular and skin parameters. Several studies have therefore explored how astaxanthin could support certain skin responses to this exposure. Through its antioxidant role, astaxanthin is studied for its ability to support certain cellular responses associated with prolonged exposure to UV radiation.
The two approaches therefore act at different levels: photoprotection remains essential to limit UV exposure, while astaxanthin is in a completely different field, that of what happens in the skin once exposure has occurred.
On the skin, astaxanthin does not act alone: it is often found associated with another star active ingredient in nutricosmetics.
Astaxanthin and collagen: why combine them?
Astaxanthin and collagen peptides are regularly combined in nutricosmetic formulas. The logic is coherent precisely because the two ingredients are studied from different angles.
Collagen peptides are the subject of research on different skin parameters; astaxanthin is notably studied around oxidative stress. Two different approaches, but potentially complementary in an internal beauty routine.
Astaxanthin and eyes: why is research interested in them?
Our eyes use a huge amount of energy to accomplish something that seems trivial to us: seeing.
The retina continuously captures light to convert it into nerve signals and contains many polyunsaturated fatty acids sensitive to oxidation, such as DHA. This is why this field occupies an important place in oxidative stress research, and why astaxanthin has found its way there.
Computer at work, phone on public transport, TV series in the evening… our eyes can spend a good part of the day alternating between different screens. A few clinical trials have therefore evaluated astaxanthin in people subjected to prolonged visual work. Some results stand out, but they depend notably on age and the measured parameter.
A study published in 2023, for example, observed an improvement in corrected visual acuity after screen work in participants aged 40 or over. This result was not found in younger participants, which suggests that the effect of astaxanthin could vary depending on age and the profile of the people studied.
These results thus open a serious path for visual function, particularly in adults more exposed to the effects of prolonged screen work. Astaxanthin does not work alone in this field: it is frequently associated with a well-known fatty acid of the retina.
And with DHA?
Astaxanthin can also be associated with DHA, an omega-3 naturally present in large quantities in the retina.
DHA constitutes one of the main structural elements of the retinal membranes; astaxanthin, on the other hand, acts rather on what happens around these membranes, in their oxidative environment.
Structure on one side, its environment on the other: two molecules that do not act on the same field, but which are often found together in the same formula for vision.
Is astaxanthin studied for other effects?
Yes! Research does not stop at the skin or the eyes. Astaxanthin is also studied in fields as varied as physical exercise, certain metabolic parameters, inflammation, or cardiovascular health.
The results and levels of evidence vary greatly depending on the subjects. Rather than turning astaxanthin into a molecule capable of doing everything, it is better to consider it for what it really is: a unique carotenoid whose several biological properties continue to be explored.
How should you take astaxanthin?
Because it is liposoluble, the way astaxanthin is consumed matters. But there is no need to make it a complicated protocol: a few guidelines are enough to understand how to simply integrate it into a routine.
One study notably observed a significantly higher exposure to astaxanthin when it was consumed after a meal rather than before. The logic is quite intuitive: since it is liposoluble, taking it during a meal containing fats is consistent with the nature of the molecule. Olive oil, avocado, nuts, eggs, or other lipid sources depending on your diet: no need to complicate the routine.
There remains an equally practical question: how much to take daily, knowing that there is no universal answer?
What dose of astaxanthin to take?
There is no universal dose corresponding to all the studied effects. Clinical trials use different quantities and durations depending on their objective.
In Europe, for astaxanthin from Haematococcus pluvialis, the maximum level for the general population aged over 14 is 8 mg of astaxanthin per day. Lower levels are defined for children. This figure is above all a guideline: the quantity provided is an important criterion, but it is not enough on its own to judge the usefulness of a formula.
Are there precautions to know with astaxanthin?
The available data in humans are very reassuring. A review dedicated to the safety of natural astaxanthin analysed 87 human studies without identifying any major safety signal in the studied conditions. European authorities have also concluded that an intake of 8 mg of astaxanthin per day from food supplements is safe in adults, taking into account the exposure also coming from food.
In order not to exceed the intended dosage, astaxanthin should not be consumed on the same day as other food supplements containing astaxanthin esters. Particularly useful information when several products are combined in the same routine.
How to choose your astaxanthin?
Faced with two bottles that seem to promise you the same thing, the difference is not always obvious at first glance. Yet, some information allows you to read a formula with much more perspective.
Look at the origin of the active ingredient
First step: clearly identify where the astaxanthin comes from.
When it comes from the microalga Haematococcus pluvialis, this origin must be easily found in the product information. Transparency about the raw material, its geographical origin when indicated, and its production process allows you to better understand what you are consuming.
A beautiful red colour on a box ultimately does not say much. Traceability, much more.
Check the actual quantity of astaxanthin
One nuance also deserves attention: the quantity of extract or oleoresin used in a formula is not necessarily equivalent to the quantity of astaxanthin actually provided.
To compare two products, it is therefore better to look at the effective quantity of astaxanthin provided by the daily dose, expressed in milligrams, rather than the total mass of the extract alone.
Do not neglect the formulation
Astaxanthin is liposoluble and sensitive to its environment. The carrier that accompanies it, its extraction process, and the way it is protected during storage therefore matter.
Human bioavailability studies have also shown that different lipid formulations could strongly change its absorption.
Looking only at the number of milligrams therefore means only reading part of the label.
So, what to remember about the benefits of astaxanthin?
Astaxanthin fascinates. Its spectacular colour, its journey through aquatic ecosystems, and its microscopic origin would almost be enough to make it unique.
Its scientific scope goes even further.
Clinical data already provide encouraging results, notably on certain skin parameters. Other areas, such as visual function, are still being explored and need further research.
This is perhaps what makes this molecule so unique: it does not need to be transformed into a "miracle antioxidant" to tell a remarkable story.
A small red molecule produced notably by a freshwater microalga, which is then found behind some of the most emblematic colours of the aquatic world, and whose distinctive features science continues to reveal, study after study.
