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Dietary Supplements free resource MedlinePlus Health Information https://medlineplus.gov/dietarysupplements.html
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/23208074/
subscription/membership/fee required Springer https://doi.org/10.1007/s00198-012-2224-2
free resource Europe PubMed Central https://europepmc.org/abstract/MED/23208074