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.
EDTA is sometimes prescribed by doctors to clean toxic metals, such as lead, from the blood. Doctors have used the molecule for decades to treat heavy metal poisoning. In those cases it is given through an IV.
EDTA is also an ingredient in some prescription cancer-fighting medicines.
Supplement makers claim that over-the-counter forms of EDTA can be taken by mouth to "detox" the body and make your gastrointestinal tract healthier. There is no scientific evidence to support this.
Some have also advertised that EDTA might help fight clogged arteries (arteriosclerosis) by removing cholesterol and plaque from the bloodstream. Again, there is no research to show this really works.