Eyebright (2014) & Corneal Cell Health
This 2014 in vitro study investigated the toxicity, free-radical fighting capacity and effect on the body's immune response of three extracts of eyebright (Euphrasia officinalis). The research found that the effects depending upon the concentration of eyebright and the type of solvent used in the extraction. These were tested on human cells from the cornea.
Three solvents were tested: heptane, ethanol, and ethyl acetate. The heptane extracts were toxic to the corneal cells and did not fight free radicals. All of the extracts had an anti-inflammatory effect.
Conclustion: The researchers found that the effects of eyebright were encouraging as an adjunct to eye care when extracts were from use of ethanol and ethyl acetate, but not heptane.
Researchers: Paduch R., et al, of several Universities in Lublin, Poland.
Published: Assessment of eyebright (euphrasia officinalis L.) extract activity in relation to human corneal cells using in vitro tests, Balkan Medical Journal, March, 2014.
Learn more about eyebright.