sources:
[1]https://www.ncbi.nlm.nih.gov/pubmed/19661447
[2]https://www.ncbi.nlm.nih.gov/pubmed/23828331
[3]https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3399220/
[4]https://www.ncbi.nlm.nih.gov/pmc/articles/
[5https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3401066/
[6]https://lpi.oregonstate.edu/mic/vitamins/vitamin-C
[7]www.ncbi.nlm.nih.gov/pubmed/9858130
[8]https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3750609/
[9]https://nutritiondata.self.com/facts/vegetables-and-vegetable-products/2383/2
[10]www.ncbi.nlm.nih.gov/pubmed/21943297
[11]https://ods.od.nih.gov/factsheets/VitaminA-HealthProfessional/
[12]https://lpi.oregonstate.edu/mic/dietary-factors/phytochemicals/carotenoids
[13]https://www.medicalnewstoday.com/articles/267290.php
[14]https://www.ncbi.nlm.nih.gov/pubmed/23117440
[15] https://pubs.acs.org/doi/abs/10.1021/jf980999y