Astaxanthin is a carotenoid, a chemical found naturally in certain plants and animals. A type of algae makes astaxanthin. This algae is used as a source for the astaxanthin in supplements.
Some types of seafood also contain astaxanthin.
Astaxanthin gives salmon and lobster their reddish color, and flamingo feathers their pink hue.
There isn't a clear optimal dose of feverfew for any condition. Quality and active ingredients in supplements may vary widely from maker to maker. This makes it hard to set a standard dose although standardized extracts have been studied in research on humans.
Can you get feverfew naturally from foods?
Some people eat the feverfew leaves, but they are bitter and may hurt your mouth.
What are the risks of taking feverfew?
Side effects. People have not reported serious side effects of feverfew. Researchers have used it safely with people in studies lasting up to four months. No one knows whether it is safe if you use it longer than that.
Side effects may include symptoms affecting the mouth, such as: