Lutein is an anti-oxidant in the carotenoid family, a group of naturally occurring fat-soluble pigments found in plants.
What it does
Lutein is the main carotenoid present in the central area of the retina called the macula and acts as a filter to damaging purple light. It works alongside another carotenoid call zeaxanthin and both are found in spinach, kale, collard greens, romaine lettuce, leeks, peas, and egg yolks.
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Lutein and zeaxanthin are typically found in combination with bilberry in supplement formulated to protect eye function.
Generally, there are no side effects or contra-indications from using lutein.
At the time of writing there were no well known negative drug interactions with lutein.