Lutein and zeaxanthin are two important carotenoids, which are pigments produced by plants that give fruits and vegetables a yellow to reddish hue.

They’re structurally very similar, with just a slight difference in the arrangement of their atoms (1Trusted Source).

Both are potent antioxidants and offer a range of health benefits. However, lutein and zeaxanthin are best known for protecting your eyes.

This article discusses the benefits of lutein and zeaxanthin, as well as supplement dosages, safety and food sources.

They’re Important Antioxidants

Lutein and zeaxanthin are powerful antioxidants that defend your body against unstable molecules called free radicals.

In excess, free radicals can damage your cells, contribute to aging and lead to the progression of diseases like heart disease, cancer, type 2 diabetes and Alzheimer’s disease (2Trusted Source, 3Trusted Source).

Lutein and zeaxanthin protect your body’s proteins, fats and DNA from stressors and can even help recycle glutathione, another key antioxidant in your body (1Trusted Source).

Additionally, their antioxidant properties may reduce the effects of “bad” LDL cholesterol, thus decreasing plaque build-up in your arteries and reducing your risk of heart disease (1Trusted Source, 4Trusted Source, 5Trusted Source).

Lutein and zeaxanthin also work to protect your eyes from free radical damage.

Your eyes are exposed to both oxygen and light, which in turn promote the production of harmful oxygen free radicals. Lutein and zeaxanthin cancel out these free radicals, so they’re no longer able to damage your eye cells (6Trusted Source).

These carotenoids seem to work better together and can combat free radicals more effectively when combined, even at the same concentration (7Trusted Source).

SUMMARY

Lutein and zeaxanthin are important antioxidants, which protect your cells from damage. Most notably, they support the clearance of free radicals in your eyes.

They Support Eye Health

Lutein and zeaxanthin are the only dietary carotenoids that accumulate in the retina, particularly the macula region, which is located at the back of your eye.

Because they’re found in concentrated amounts in the macula, they’re known as macular pigments (8Trusted Source).

The macula is essential for vision. Lutein and zeaxanthin work as important antioxidants in this area by protecting your eyes from harmful free radicals. It’s thought that a reduction of these antioxidants over time can impair eye health (9Trusted Source, 10Trusted Source).

Lutein and zeaxanthin also act as a natural sunblock by absorbing excess light energy. They’re thought to especially protect your eyes from harmful blue light (9Trusted Source).

Below are some conditions with which lutein and zeaxanthin may help:

The research to support lutein and zeaxanthin for eye health is promising, but not all studies show benefits. For example, some studies found no link between lutein and zeaxanthin intake and the risk of early onset age-related macular degeneration (11Trusted Source, 23Trusted Source).

While there are many factors at play, having enough lutein and zeaxanthin is still crucial to your overall eye health.

SUMMARY

Lutein and zeaxanthin may help improve or reduce the progression of many eye conditions, but they may not reduce your risk of early onset age-related degeneration.

May Protect Your Skin

Only in recent years have the beneficial effects of lutein and zeaxanthin on skin been discovered.

Their antioxidant effects allow them to protect your skin from the sun’s damaging ultraviolet (UV) rays (24Trusted Source).

A two-week animal study showed that rats who received 0.4% lutein- and zeaxanthin-enriched diets had less UVB-induced skin inflammation than those who received only 0.04% of these carotenoids (25Trusted Source).

Another study in 46 people with mild-to-moderate dry skin found that those who received 10 mg of lutein and 2 mg of zeaxanthin had significantly improved skin tone, compared to the control group (26Trusted Source).

Furthermore, lutein and zeaxanthin may protect your skin cells from premature aging and UVB-induced tumors (27Trusted Source).

SUMMARY

Lutein and zeaxanthin work as supportive antioxidants in your skin. They can protect it from sun damage and may help improve skin tone and slow aging.

Lutein and Zeaxanthin Supplements

Lutein and zeaxanthin are widely recommended as dietary supplements to prevent visual loss or eye disease.

They’re usually sourced from marigold flowers and mixed with waxes but can also be made synthetically (10Trusted Source).

These supplements are especially popular among older adults who are concerned about failing eye health.

Low levels of lutein and zeaxanthin in the eyes are associated with age-related macular degeneration (AMD) and cataracts, while higher blood levels of these carotenoids are linked to an up to 57% reduced risk of AMD (6Trusted Source, 28Trusted Source, 29Trusted Source).

Other people may benefit from lutein and zeaxanthin supplements, as dietary intakes of carotenoids are often low (13Trusted Source).

Supplementing with lutein and zeaxanthin can also improve your overall antioxidant status, which may offer greater protection against stressors.

SUMMARY

Lutein and zeaxanthin supplements have become very popular among people concerned with their eye health but may also benefit those with poor dietary intake.

Dosage

There’s currently no recommended dietary intake for lutein and zeaxanthin.

What’s more, the amount of lutein and zeaxanthin your body requires may depend on the amount of stress it endures. For example, smokers may need more lutein and zeaxanthin, as they tend to have lower levels of carotenoids, compared to non-smokers (1Trusted Source).

It’s estimated that Americans consume an average 1–3 mg of lutein and zeaxanthin daily. However, you may need a lot more than this to reduce your risk of age-related macular degeneration (AMD) (13Trusted Source).

In fact, 6–20 mg of dietary lutein per day are associated with a reduced risk of eye conditions (13Trusted Source, 30Trusted Source).

Research from the Age-Related Eye Disease Study 2 (AREDS2) found that 10 mg of lutein and 2 mg of zeaxanthin caused a significant reduction in the progression to advanced age-related macular degeneration (31Trusted Source).

Likewise, supplementing with 10 mg of lutein and 2 mg of zeaxanthin can improve overall skin tone (26Trusted Source).

SUMMARY

10 mg of lutein and 2 mg of zeaxanthin appear to be effective in studies, but further research is needed to identify the optimal dosage for health.

Potential Side Effects and Safety

There appear to be very few side effects associated with lutein and zeaxanthin supplements.

A large-scale eye study found no adverse effects of lutein and zeaxanthin supplements over five years. The only side effect identified was some skin yellowing that was not considered harmful (32Trusted Source).

However, one case study found crystal development in the eyes of an older woman who supplemented with 20 mg of lutein per day and also consumed a high-lutein diet for eight years.

Once she stopped taking the supplement, the crystals disappeared in one eye but remained in the other (33Trusted Source).

Lutein and zeaxanthin have an excellent safety profile (34Trusted Source, 35Trusted Source).

Research estimates that 0.45 mg per pound (1 mg per kg) of body weight of lutein and 0.34 mg per pound (0.75 mg per kg) of body weight of zeaxanthin daily are safe. For a 154-pound (70-kg) person, this equates to 70 mg of lutein and 53 mg of zeaxanthin (10Trusted Source).

A study in rats found no adverse effects for lutein or zeaxanthin for daily doses of up to 1,814 mg per pound (4,000 mg/kg) of body weight, which was the highest dose tested (35Trusted Source).

Though there are very few reported side effects of lutein and zeaxanthin supplements, more research is needed to evaluate the potential side effects of very high intakes.

SUMMARY

Lutein and zeaxanthin are overall safe to supplement at the recommended doses, but skin yellowing may occur over time.

Food Sources

Although lutein and zeaxanthin are responsible for the bright colors of many fruits and vegetables, they’re actually found in greater amounts in leafy green vegetables (26Trusted Source, 36Trusted Source).

Interestingly, the chlorophyll in dark-green vegetables masks lutein and zeaxanthin pigments, so the vegetables appear green in color.

Key sources of these carotenoids include kale, parsley, spinach, broccoli and peas. Kale is one of the best sources of lutein with 48–115 mcg per gram of kale. By comparison, a carrot may only contain 2.5–5.1 mcg of lutein per gram (36Trusted Source, 37Trusted Source, 38).

Orange juice, honeydew melon, kiwis, red peppers, squash and grapes are also good sources of lutein and zeaxanthin, and you can find a decent amount of lutein and zeaxanthin in durum wheat and corn as well (1Trusted Source, 36Trusted Source, 39Trusted Source).

In addition, egg yolk may be an important source of lutein and zeaxanthin, as the high fat content of the yolk may improve the absorption of these nutrients (36Trusted Source).

Fats improve the absorption of lutein and zeaxanthin, so including them in your diet, such as some olive oil in a green salad or some butter or coconut oil with your cooked greens, is a good idea (10Trusted Source).

SUMMARY

Dark-green vegetables, such as kale, spinach, and broccoli, are fantastic sources of lutein and zeaxanthin. Foods like egg yolk, peppers and grapes are good sources, too.

The Bottom Line

Lutein and zeaxanthin are powerful antioxidant carotenoids, found in high amounts in dark-green vegetables and available in supplement form.

Daily doses of 10 mg of lutein and 2 mg of zeaxanthin may improve skin tone, protect your skin from sun damage and reduce the progression of age-related macular degeneration and cataracts.

Dietary intakes of these carotenoids are low in the average diet, possibly giving you just another good reason to increase your fruit and vegetable intake.

Written by Sharon O’Brien MS, PGDip — Updated on July 11, 2018