Name	Info	Provider	Link
	free resource	BioMed Central	https://nutritionj.biomedcentral.com/articles/10.1186/1475-2891-9-34
Vitamin A	free resource	MedlinePlus Health Information	https://medlineplus.gov/vitamina.html
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/20809963/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/20809963