The red pigment that colours salmon, now sold as an antioxidant.
Retina ClearIn plain words
Astaxanthin is made by microalgae and passes up the food chain into salmon, trout and shrimp. Supplements are usually extracted from the algae.
Retina ClearWhat the evidence shows
A handful of short trials, mostly in office workers with tired eyes, saw small gains in focusing comfort. The studies are small, brief and often use a stated daily dose that is printed on the label.
In this capsule
The seller names it in the formula with no dose, so you cannot compare it with the trials.
Watch-outs: Usually well tolerated; occasional stomach upset. It may add to the effect of blood-pressure medicine.
Common question
Does astaxanthin fix eye strain?
It may help a little for some people, but breaks, lighting and a correct glasses prescription do more.