Fatty Fish and Fish Liver Oils: These are the richest natural sources of vitamin D, particularly fatty fish like salmon, tuna, and mackerel.
Egg Yolks: A modest source of vitamin D, especially from pasture-raised hens.
Mushrooms: Certain types of mushrooms, particularly those exposed to UV light, can produce vitamin D.
Fortified Foods: Many dairy products, including milk, cheese, and yogurt, are fortified with vitamin D. Additionally, some brands of orange juice and cereals are fortified with this nutrient.

What Is The Best Vitamin D Supplement Available?