Supplement · Grade B

Astaxanthin and medications.

Not yet catalogued in the Distil interactions database. We surface that distinction explicitly.

Astaxanthin is in the Distil supplement database, evidence Grade B. The page below lists every medication we have explicitly assessed it against.

Astaxanthin is a red-orange carotenoid pigment from the microalga Haematococcus pluvialis, and it acts as a strong antioxidant in cell membranes. The evidence is Grade B as an antioxidant, and Grade C for skin, eye health and exercise, which are the three claims most often made for it. Skin is worth being blunt about, because it is the most heavily marketed of the three: every placebo-controlled trial of astaxanthin on its own for skin was authored by a manufacturer of it, and the pooled analysis of those trials found no effect on wrinkle depth. The honest framing is that these are mostly mechanism and biomarker findings rather than large hard-outcome trials, so think of it as plausible support rather than a proven treatment. On exercise specifically, this has been tested rather than merely under-studied: a pooled analysis of 24 randomised trials found no effect on oxygen uptake, time-trial performance or maximum power, and what signal exists sits on markers of muscle damage rather than on performance itself. It is not a compound to take expecting to go faster or lift more. Use the natural Haematococcus form at 4 to 12mg daily; synthetic versions are not equivalent. On eye health it tends to pair logically with lutein for retinal protection. Interaction-wise it is reassuring: its antiplatelet potential is negligible at standard doses, so it can sit alongside other antiplatelet compounds without meaningfully adding to bleeding risk. Side effects are cosmetic at most, a harmless skin tint or orange stools at high intake. A practical note: take it with a fat-containing meal, since it absorbs better that way.

We have not yet completed an explicit assessment of medications for Astaxanthin in the Distil interactions database. We surface this distinction deliberately: the Distil checker tells you when we have explicitly assessed a pair and when we have not, because both are useful information. If you take Astaxanthin alongside a medication, the checker below will surface anything already in our database, and the missing-item form at the bottom of the page routes uncatalogued pairs into our next curation pass.

What this list does not say. Pairs not flagged here are not implicitly safe. They are either not yet in our database, or fall outside our inclusion scope. Use the checker below to surface any medication, and submit a missing item if you take something we have not catalogued.

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For adults over 18. This tool gives evidence-graded information, not medical advice. Always discuss changes with your GP or pharmacist, especially if you take any medication, are pregnant, breastfeeding, or have a serious health condition.

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How the checker decides

Every result has a source

Each pair we have assessed is cited to a published study (PMID) or the British National Formulary, so you can read the source yourself.

Four kinds of answer

Severe, caution, no known interaction, and not yet assessed. A pair we have not assessed is never shown as clear.

Severe
Caution
No known interaction
Not yet assessed

Nothing in our data is not a clearance

When nothing in our data records a problem with a pair, the result says no known interaction at typical doses, which is not a clearance: your pharmacist or GP can check the pair against your full medical history.

Read the full methodology

The full report

A full supplement review, built around you, not a generic stack.

The free checker answers one interaction question at a time. A Distil report reviews the bigger picture: your goals, diet, medications, current supplements and any blood results you provide, then shows what appears worth keeping, changing, adding or leaving out.

what your diet already covers, so you are not adding a capsule for something food is already handling
which evidence-graded compounds are worth considering for your goals, and which were considered but left out
what to keep, change or stop from what you already take, plus the order to introduce anything new
how your medications and complete supplement stack fit together, with daily timing and a clear point for reassessment

The interaction check is one section of the full report. You also get the reasoning behind each recommendation and the evidence references used.

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Distil's interactions database is reviewed and updated every quarter. We grade evidence transparently and publish our methodology, including every database change, at /about/methodology. This tool is information, not a substitute for clinical judgement. If you take medication and supplements together, your GP or pharmacist can review your full regimen against your medical history. If you want a full personalised stack reasoned against this same database, the Distil report is the next step up.