Astaxanthin is a naturally occurring carotenoid pigment, belonging to a larger class of phytochemicals known as terpenes. It is responsible for the red/pink color in many marine organisms, including microalgae (such as *Haematococcus pluvialis*), salmon, trout, krill, shrimp, and lobster. Unlike some other carotenoids (e.g., beta-carotene), astaxanthin does not convert to vitamin A in the human body, meaning it does not carry the risk of pro-vitamin A toxicity. It is recognized for its potent antioxidant properties, significantly higher than those of vitamin E or beta-carotene. Chemically, its unique structure, particularly the presence of hydroxyl and keto groups on each ring structure, allows it to span cellular membranes, providing comprehensive antioxidant protection from both the aqueous and lipid phases of cells. Due to its vibrant color and health-promoting properties, astaxanthin is used as a dietary supplement and a food colorant. (NIH ODS, PubChem)
Deep dive
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Known interactions
Category rule: glp1 × supplement
Note
GLP-1 medications slow stomach emptying, changing how/when oral supplements absorb; rapid weight loss raises the importance of protein and micronutrients.
Time oral supplements when nausea is lowest; prioritize protein and micronutrients; discuss with your provider.
Category rule: supplement × medication
Note
Some supplements change how the body processes medications (absorption, liver enzymes, or additive effects).
Specific pairs are checked against a licensed drug database and shown with their own severity. Always confirm with your provider or pharmacist.
Frequently asked
Sources referenced
["Cochrane Library", "DrugBank", "Examine.com", "Mayo Clinic", "MedlinePlus", "National Institutes of Health Office of Dietary Supplements (NIH ODS)", "PubChem"]
DoseRoutine compiles summaries from publicly available scientific and regulatory references. Always verify important decisions with a licensed clinician.
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