Life Extension Magazine®

Kale that are dense in lutein and quercetin


Kale is one of the most nutrient-dense foods on Earth, boosting anticancer effects, oxidant reduction, and vision protection.

Scientifically reviewed by: Holli Ryan, RD, LD/N, in August 2023. Written by: Garry Messick.

If a vegetable can be said to be trendy, kale fits that description.

In recent years, this green, leafy, cruciferous vegetable, a member of the cabbage family, has become very popular, and with good reason. Experts say that kale is one of the most nutrient-dense foods on earth. But that’s just the beginning of the story…

Anticancer Properties

Kale contains a number of compounds that have been found to be associated with anticancer effects. These include indole-3-carbinol1 as well as sulforaphane, which offer significant protection against the development of the disease.2

Oxidant Reducers

Oxidant reducers help fight diseases of aging, including cancer, that our bodies are susceptible to due to the destructive effects of free radicals. Kale contains these compounds.3 Flavonoids are also found in kale in the form of quercetin and kaempferol. These substances are associated with anti-inflammatory, anticancer, and antiviral properties.4

Eye Protection

Studies show that supplementing with lutein and zeaxanthin significantly lowers your risk of age-related loss of eyesight due to cataracts and macular degeneration,5 and kale contains both of these carotenoids in small amounts.


  1. Adv Pharmacol Sci. 2014;2014:832161.
  2. Cancer Treat Res. 2014;159:207-23.
  3. Acta Sci Pol Technol Aliment. 2012;11(3):239-48.
  4. ScientificWorldJournal. 2013;2013:162750.
  5. Invest Ophthalmol Vis Sci. 2003;44(6):2461-5.