RESEARCH STARTER

Lutein as a dietary supplement

Lutein is a carotenoid, a type of antioxidant found primarily in green vegetables such as spinach, kale, and collard greens. It is recognized for its potential benefits in eye health, particularly in protecting against age-related conditions like macular degeneration and cataracts. Lutein may function as a natural filter against harmful light and neutralizes free radicals, which can cause cellular damage. While it is not considered an essential nutrient, many people seek it out for its possible health advantages. Therapeutic dosages for lutein supplements typically range from five to thirty milligrams daily, but the exact amount needed for optimal effects remains unclear.

Studies indicate that individuals who consume foods rich in lutein may experience a reduced risk of developing significant vision issues. However, the scientific community is divided on its effectiveness, as some larger studies have found limited benefits from supplementation. Safety evaluations suggest that lutein is generally safe when taken in moderate amounts, although long-term use may carry potential risks, especially in specific populations. As research continues, lutein remains a popular choice among those interested in dietary supplements for eye health and overall well-being.

Full Article

  • DEFINITION: Natural substance promoted as a dietary supplement for specific health benefits.
  • PRINCIPAL PROPOSED USES: None
  • OTHER PROPOSED USES: Atherosclerosis, cataracts, cardiovascular health, cognitive function, macular degeneration, retinitis pigmentosa, skin health

Overview

Lutein, a chemical found in green vegetables, is a member of a family of substances known as carotenoids. Beta-carotene is the best-known nutrient in this class. Like beta-carotene, lutein is an antioxidant that protects cells against damage caused by dangerous, naturally occurring chemicals known as free radicals.

Evidence has shown that lutein may be important in protecting eyes and eyesight. It may work in two ways: by acting directly as a kind of natural sunblock, and also by neutralizing free radicals that can damage the eye.

Sources

Lutein is not an essential nutrient, but it may be useful for optimal health. Green vegetables, especially spinach, kale, collard greens, romaine lettuce, leeks, and peas, are the best sources of lutein. Unlike beta-carotene, lutein is not found in high concentrations in yellow and orange vegetables such as carrots.

Therapeutic Dosages

It is not known how much lutein is necessary for a therapeutic effect, but estimates range from 5 to 30 milligrams (mg) daily.

Therapeutic Uses

According to several double-blind studies, lutein supplements might help prevent or slow the development of age-related macular degeneration and possibly cataracts, the two most common causes of vision loss in older populations. Lutein has also shown some promise for treating retinitis pigmentosa, an inherited form of eye disease that causes progressive vision loss.

In some studies, supplementation with lutein increased cognitive function in older adults. Weak evidence suggests that lutein might help prevent atherosclerosis and contribute to cardiovascular health. Studies also showed that lutein might benefit skin health by providing sun protection. Finally, lutein’s antioxidant properties may protect against free radicals, which cause chronic health conditions. 

Scientific Evidence

Most observational studies suggest that people who eat foods containing lutein are less likely to develop cataracts and perhaps macular degeneration, the two most common causes of vision loss in adults. Furthermore, there are good theoretical reasons to believe that lutein may be important in protecting the eyes.

Lutein is the primary pigment (coloring chemical) in the center of the retina, the region of maximum visual sensitivity known as the macula. Macular degeneration consists of injury to the macula and leads to severe vision loss. One of the main causes of macular degeneration appears to be sun damage to the sensitive tissue. Lutein appears to act as a natural eyeshade, protecting the retina against too much light. It is also an antioxidant, meaning that it fights free radicals. Free radicals may play a role in macular degeneration.

Based on this information, researchers have conducted several double-blind, placebo-controlled trials of lutein. One study enrolled ninety people with dry-type macular degeneration and followed them for twelve months. The participants received either lutein (10 mg), lutein plus other antioxidants and a multivitamin/mineral supplement, or a placebo. At the end of the study period, participants who had taken lutein alone or lutein plus the other nutrients showed improved vision, while no change in vision was seen in the placebo group.

A subsequent study failed to find a benefit with lutein, but it used a lower dose (6 mg daily) and involved fewer people. Ultimately, further study is needed to establish whether lutein is helpful for macular degeneration. However, the results of several double-blind, placebo-controlled trials appear to indicate that lutein is beneficial for the condition.

Besides protecting the macula, lutein might also shield the lens of the eye from light damage, slowing the development of cataracts. One small, two-year, double-blind, placebo-controlled trial found evidence that lutein may improve vision in people with cataracts. A trial involving 225 adults with retinitis pigmentosa found that four years of daily supplementation with lutein and vitamin A slowed the rate of visual loss in the mid-peripheral field.

Though lutein has shown the potential to protect against vision-related conditions and illnesses, some studies in the 2010s cast doubt on its effectiveness. An extensive 2013 study, the Age-Related Eye Disease Study, found no benefit from supplementation with lutein, while a systematic review of literature published in 2017 found similar evidence of lutein’s limited effectiveness in preventing and alleviating vision issues. Still, several other studies found lutein effective in preventing eye conditions such as macular degeneration. These mixed results indicated that additional scientific study was necessary. A 2025 study investigated the potential benefits of the supplement Lute-gen (lutein and zeaxanthin) for improving eye strain, eye health, and sleep quality in people who reported heavy daily screen use. The double-blind, placebo-controlled trial found positive results after six months with few side effects, but these findings were not supported by group differences in self-report surveys.

Lutein has also been studied for benefits beyond protecting the eyes and eyesight. The same antioxidant properties that protect eye health also aid in heart health. Lutein was also found to lower cholesterol and triglycerides through its anti-inflammatory properties. Several small studies pointed to the potential of lutein as an anti-cancer tool. Studies also showed lutein could protect the skin from sun damage. Finally, small studies have also shown lutein’s potential to protect against neurodegenerative diseases and improve cognitive function.

Safety Issues

Although lutein is a normal part of the diet, there has not been much evaluation of lutein’s safety when taken as a concentrated supplement. One study found evidence that lutein is safe in doses up to the highest tested dose of 10 mg daily. A review of other evidence concluded that long-term use of lutein should be safe when taken at a dose of up to 20 mg per day. However, a 2009 study following 77,126 adults (older than fifty years) suggests that there may be some harm in long-term supplementation with lutein. This study found that long-term use of beta-carotene, lutein, or retinol supplements may increase lung cancer risk. Long-term supplement use was determined by participants’ memory of the previous ten years, so the results of this large study should be interpreted with some caution. Finally, maximum safe dosages for young children, pregnant or nursing women, and those with severe liver or kidney disease have not been established.


Bibliography

Bakri, Sophie. "The Best Vitamins for Your Eyes." Mayo Clinic Press, 12 May 2023, mcpress.mayoclinic.org/living-well/the-best-vitamins-for-your-eyes. Accessed 14 Dec. 2025.

Berson, E. L., et al. "Clinical Trial of Lutein in Patients with Retinitis Pigmentosa Receiving Vitamin A." Archives of Ophthalmology, vol. 128, 2010, pp. 403-11, doi:10.1001/archophthalmol.2010.32. Accessed 14 Dec. 2025.

Feeney, Joanne, et al. "Plasma Lutein and Zeaxanthin Are Associated with Better Cognitive Function Across Multiple Domains in a Large Population-Based Sample of Older Adults: Findings from the Irish Longitudinal Study on Aging." The Journals of Gerontology: Series A, vol. 72, no. 10, 2017, pp. 1431-36, doi:10.1093/gerona/glw330. Accessed 14 Dec. 2025.

Gale, Catharine R., et al. "Lutein and Zeaxanthin Status and Risk of Age-Related Macular Degeneration." Investigative Ophthalmology & Visual Science, vol. 44, no. 6, 2003, pp. 2461-65, doi:10.1167/iovs.02-0929. Accessed 14 Dec. 2025.

Lefton, Jennifer. "The Health Benefits of Lutein." Verywell Health, 16 Oct. 2025, www.verywellhealth.com/can-lutein-supplements-protect-your-eyes-89060. Accessed 14 Dec. 2025.

Lopresti, A. L., and S. J. Smith. “The Effects of Lutein/ Zeaxanthin (Lute-Gen®) on Eye Health, Eye Strain, Sleep Quality, and Attention in High Electronic Screen Users: A Randomized, Double-Blind, Placebo-Controlled Study.” Frontiers in Nutrition, vol. 12, 2025, p. 1522302, doi:10.3389/fnut.2025.1522302. Accessed 14 Dec. 2025.

"Lutein." Drugs.com, 17 Mar. 2025, www.drugs.com/npp/lutein.html. Accessed 14 Dec. 2025.

Olmedilla, B., et al. "Lutein, but Not Alpha-Tocopherol, Supplementation Improves Visual Function in Patients with Age-Related Cataracts." Nutrition, vol. 19, 2003, pp. 21-24.

Satia, J. A., et al. "Long-Term Use of Beta-Carotene, Retinol, Lycopene, and Lutein Supplements and Lung Cancer Risk." American Journal of Epidemiology, vol. 169, 2009, pp. 815-28.

Shao, A., and J. N. Hathcock. "Risk Assessment for the Carotenoids Lutein and Lycopene." Regulatory Toxicology and Pharmacology, vol. 45, 2006, pp. 289-98.

Rosenthal, J. M., et al. "Dose-Ranging Study of Lutein Supplementation in Persons Aged Sixty Years or Older." Investigative Ophthalmology and Visual Science, vol. 47, 2006, pp. 5227-33.

Warwick, Kathy W., and Ellen Landes. "Lutein: Health Benefits and Top Food Sources." Healthline, 26 Aug. 2021, www.healthline.com/nutrition/lutein. Accessed 14 Dec. 2025.

"What Is Lutein? Learn about Its Health Benefits." Cleveland Clinic, 4 Apr. 2024, health.clevelandclinic.org/lutein. Accessed 14 Dec. 2025.

Full Article

  • DEFINITION: Natural substance promoted as a dietary supplement for specific health benefits.
  • PRINCIPAL PROPOSED USES: None
  • OTHER PROPOSED USES: Atherosclerosis, cataracts, cardiovascular health, cognitive function, macular degeneration, retinitis pigmentosa, skin health

Overview

Lutein, a chemical found in green vegetables, is a member of a family of substances known as carotenoids. Beta-carotene is the best-known nutrient in this class. Like beta-carotene, lutein is an antioxidant that protects cells against damage caused by dangerous, naturally occurring chemicals known as free radicals.

Evidence has shown that lutein may be important in protecting eyes and eyesight. It may work in two ways: by acting directly as a kind of natural sunblock, and also by neutralizing free radicals that can damage the eye.

Sources

Lutein is not an essential nutrient, but it may be useful for optimal health. Green vegetables, especially spinach, kale, collard greens, romaine lettuce, leeks, and peas, are the best sources of lutein. Unlike beta-carotene, lutein is not found in high concentrations in yellow and orange vegetables such as carrots.

Therapeutic Dosages

It is not known how much lutein is necessary for a therapeutic effect, but estimates range from 5 to 30 milligrams (mg) daily.

Therapeutic Uses

According to several double-blind studies, lutein supplements might help prevent or slow the development of age-related macular degeneration and possibly cataracts, the two most common causes of vision loss in older populations. Lutein has also shown some promise for treating retinitis pigmentosa, an inherited form of eye disease that causes progressive vision loss.

In some studies, supplementation with lutein increased cognitive function in older adults. Weak evidence suggests that lutein might help prevent atherosclerosis and contribute to cardiovascular health. Studies also showed that lutein might benefit skin health by providing sun protection. Finally, lutein’s antioxidant properties may protect against free radicals, which cause chronic health conditions. 

Scientific Evidence

Most observational studies suggest that people who eat foods containing lutein are less likely to develop cataracts and perhaps macular degeneration, the two most common causes of vision loss in adults. Furthermore, there are good theoretical reasons to believe that lutein may be important in protecting the eyes.

Lutein is the primary pigment (coloring chemical) in the center of the retina, the region of maximum visual sensitivity known as the macula. Macular degeneration consists of injury to the macula and leads to severe vision loss. One of the main causes of macular degeneration appears to be sun damage to the sensitive tissue. Lutein appears to act as a natural eyeshade, protecting the retina against too much light. It is also an antioxidant, meaning that it fights free radicals. Free radicals may play a role in macular degeneration.

Based on this information, researchers have conducted several double-blind, placebo-controlled trials of lutein. One study enrolled ninety people with dry-type macular degeneration and followed them for twelve months. The participants received either lutein (10 mg), lutein plus other antioxidants and a multivitamin/mineral supplement, or a placebo. At the end of the study period, participants who had taken lutein alone or lutein plus the other nutrients showed improved vision, while no change in vision was seen in the placebo group.

A subsequent study failed to find a benefit with lutein, but it used a lower dose (6 mg daily) and involved fewer people. Ultimately, further study is needed to establish whether lutein is helpful for macular degeneration. However, the results of several double-blind, placebo-controlled trials appear to indicate that lutein is beneficial for the condition.

Besides protecting the macula, lutein might also shield the lens of the eye from light damage, slowing the development of cataracts. One small, two-year, double-blind, placebo-controlled trial found evidence that lutein may improve vision in people with cataracts. A trial involving 225 adults with retinitis pigmentosa found that four years of daily supplementation with lutein and vitamin A slowed the rate of visual loss in the mid-peripheral field.

Though lutein has shown the potential to protect against vision-related conditions and illnesses, some studies in the 2010s cast doubt on its effectiveness. An extensive 2013 study, the Age-Related Eye Disease Study, found no benefit from supplementation with lutein, while a systematic review of literature published in 2017 found similar evidence of lutein’s limited effectiveness in preventing and alleviating vision issues. Still, several other studies found lutein effective in preventing eye conditions such as macular degeneration. These mixed results indicated that additional scientific study was necessary. A 2025 study investigated the potential benefits of the supplement Lute-gen (lutein and zeaxanthin) for improving eye strain, eye health, and sleep quality in people who reported heavy daily screen use. The double-blind, placebo-controlled trial found positive results after six months with few side effects, but these findings were not supported by group differences in self-report surveys.

Lutein has also been studied for benefits beyond protecting the eyes and eyesight. The same antioxidant properties that protect eye health also aid in heart health. Lutein was also found to lower cholesterol and triglycerides through its anti-inflammatory properties. Several small studies pointed to the potential of lutein as an anti-cancer tool. Studies also showed lutein could protect the skin from sun damage. Finally, small studies have also shown lutein’s potential to protect against neurodegenerative diseases and improve cognitive function.

Safety Issues

Although lutein is a normal part of the diet, there has not been much evaluation of lutein’s safety when taken as a concentrated supplement. One study found evidence that lutein is safe in doses up to the highest tested dose of 10 mg daily. A review of other evidence concluded that long-term use of lutein should be safe when taken at a dose of up to 20 mg per day. However, a 2009 study following 77,126 adults (older than fifty years) suggests that there may be some harm in long-term supplementation with lutein. This study found that long-term use of beta-carotene, lutein, or retinol supplements may increase lung cancer risk. Long-term supplement use was determined by participants’ memory of the previous ten years, so the results of this large study should be interpreted with some caution. Finally, maximum safe dosages for young children, pregnant or nursing women, and those with severe liver or kidney disease have not been established.


Bibliography

Bakri, Sophie. "The Best Vitamins for Your Eyes." Mayo Clinic Press, 12 May 2023, mcpress.mayoclinic.org/living-well/the-best-vitamins-for-your-eyes. Accessed 14 Dec. 2025.

Berson, E. L., et al. "Clinical Trial of Lutein in Patients with Retinitis Pigmentosa Receiving Vitamin A." Archives of Ophthalmology, vol. 128, 2010, pp. 403-11, doi:10.1001/archophthalmol.2010.32. Accessed 14 Dec. 2025.

Feeney, Joanne, et al. "Plasma Lutein and Zeaxanthin Are Associated with Better Cognitive Function Across Multiple Domains in a Large Population-Based Sample of Older Adults: Findings from the Irish Longitudinal Study on Aging." The Journals of Gerontology: Series A, vol. 72, no. 10, 2017, pp. 1431-36, doi:10.1093/gerona/glw330. Accessed 14 Dec. 2025.

Gale, Catharine R., et al. "Lutein and Zeaxanthin Status and Risk of Age-Related Macular Degeneration." Investigative Ophthalmology & Visual Science, vol. 44, no. 6, 2003, pp. 2461-65, doi:10.1167/iovs.02-0929. Accessed 14 Dec. 2025.

Lefton, Jennifer. "The Health Benefits of Lutein." Verywell Health, 16 Oct. 2025, www.verywellhealth.com/can-lutein-supplements-protect-your-eyes-89060. Accessed 14 Dec. 2025.

Lopresti, A. L., and S. J. Smith. “The Effects of Lutein/ Zeaxanthin (Lute-Gen®) on Eye Health, Eye Strain, Sleep Quality, and Attention in High Electronic Screen Users: A Randomized, Double-Blind, Placebo-Controlled Study.” Frontiers in Nutrition, vol. 12, 2025, p. 1522302, doi:10.3389/fnut.2025.1522302. Accessed 14 Dec. 2025.

"Lutein." Drugs.com, 17 Mar. 2025, www.drugs.com/npp/lutein.html. Accessed 14 Dec. 2025.

Olmedilla, B., et al. "Lutein, but Not Alpha-Tocopherol, Supplementation Improves Visual Function in Patients with Age-Related Cataracts." Nutrition, vol. 19, 2003, pp. 21-24.

Satia, J. A., et al. "Long-Term Use of Beta-Carotene, Retinol, Lycopene, and Lutein Supplements and Lung Cancer Risk." American Journal of Epidemiology, vol. 169, 2009, pp. 815-28.

Shao, A., and J. N. Hathcock. "Risk Assessment for the Carotenoids Lutein and Lycopene." Regulatory Toxicology and Pharmacology, vol. 45, 2006, pp. 289-98.

Rosenthal, J. M., et al. "Dose-Ranging Study of Lutein Supplementation in Persons Aged Sixty Years or Older." Investigative Ophthalmology and Visual Science, vol. 47, 2006, pp. 5227-33.

Warwick, Kathy W., and Ellen Landes. "Lutein: Health Benefits and Top Food Sources." Healthline, 26 Aug. 2021, www.healthline.com/nutrition/lutein. Accessed 14 Dec. 2025.

"What Is Lutein? Learn about Its Health Benefits." Cleveland Clinic, 4 Apr. 2024, health.clevelandclinic.org/lutein. Accessed 14 Dec. 2025.

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