Calcium NIH recommendations: https://ods.od.nih.gov/factsheets/Calcium-HealthProfessional/
Magnesium NIH recommendations: https://ods.od.nih.gov/factsheets/Magnesium-Consumer/
Selenium NIH recommendations: https://ods.od.nih.gov/factsheets/Selenium-HealthProfessional/
Vitamin A NIH recommendations: https://ods.od.nih.gov/factsheets/VitaminA-Consumer/
Vitamin C NIH recommendations: https://ods.od.nih.gov/factsheets/VitaminC-Consumer/
Vitamin D NIH recommendations: https://ods.od.nih.gov/factsheets/VitaminD-HealthProfessional/
Vitamin E NIH recommendations: https://ods.od.nih.gov/factsheets/VitaminE-Consumer/