Cranberry

https://academic.oup.com/cid/article/38/10/1413/345228
https://www.bmj.com/content/322/7302/1571?iframe=true&width=10
https://onlinelibrary.wiley.com/doi/abs/10.1002/mnfr.200700038

Vitamina C

https://www.karger.com/Article/Abstract/213131

Zinco

https://link.springer.com/chapter/10.1007/978-1-4615-5763-0_8
https://journals.lww.com/co-clinicalnutrition/Abstract/2009/11000/Zinc__role_in_immunity,_oxidative_stress_and.16.aspx

Selenio

https://onlinelibrary.wiley.com/doi/abs/10.1002/jsfa.2943