https://www.webmd.com/vitamins-and-supplements/supplement-faq (Referred on 24-Jun-2021)
https://www.emedicinehealth.com/slideshow_nutritional_health_vitamin_d/article_em.htm (Referred on 24-Jun-2021)
https://www.news-medical.net/health/What-are-Nutraceuticals.aspx (Referred on 24-Jun-2021)
https://www.nccih.nih.gov/health/vitamins-and-minerals (Referred on 24-Jun-2021)
https://kidshealth.org/en/teens/vitamins-minerals.html (Referred on 24-Jun-2021)