This subject seems to come up on this forum periodically. I'm really surprised how many people so frequently decide to treat the subject with such skepticism.

https://www.ars.usda.gov/plains-area/gfnd/gfhnrc/docs/news-2...

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1633749/

https://www.nhs.uk/news/food-and-diet/eating-leafy-greens-ma...

https://www.health.harvard.edu/vision/harvard-researchers-fi...

http://pubmedcentralcanada.ca/pmcc/articles/PMC5642804/

https://www.sciencedaily.com/releases/2017/07/170725122004.h...

Wash your greens well and make sure you eat them!