antioxidant · for eye strain
Lutein
Thickens the pigment in your retina, which sharpens contrast and cuts glare.
Say that in clinical terms
Improves macular pigment optical density, enhances contrast sensitivity, reduces glare disability.
How strong is the research?
A 6-month trial in 70 heavy screen users found no significant improvement.
5 papers read, 3 supporting, 1 against.
Tested as: Lutein + zeaxanthin + meso-zeaxanthin three-carotenoid blend
Who was studied: Healthy adults tested under controlled glare in a laboratory.
How much to take
daily
10–20 mg
Effects on visual performance appear within 4-6 weeks.
Before you take it
- No established NIH/IOM Tolerable Upper Intake Level (UL) for lutein or zeaxanthin; the Food and Nutrition Board has not set a formal UL for either carotenoid.
- Carotenodermia (benign, reversible yellowing of skin and mucous membranes) has been reported in isolated case reports involving prolonged high-dose use, with cases documented at doses above approximately 20 mg/day; no formal adverse-event threshold is established.
- Absorption of lutein and zeaxanthin is substantially reduced by orlistat (intestinal fat-absorption blocker) and bile acid sequestrants (e.g., cholestyramine, colestipol); timing separation or clinical monitoring is advisable when co-administered.
- High-dose beta-carotene co-supplementation competes with lutein and zeaxanthin for intestinal absorption via shared carotenoid transporters; high beta-carotene doses may reduce lutein/zeaxanthin bioavailability.
What we make of it
It measured glare recovery, which is not the same as eye strain.
The detail
The trial measured how quickly vision recovered from bright light and how well people handled glare. Eye strain is mostly a muscle-fatigue problem from focusing, which is different.