BIOMOLECULES AND ENZYMES

Detailed explanation-1: -The body creates vitamin D from direct sunlight on the skin when outdoors. But between October and early March we do not make enough vitamin D from sunlight. Read more about vitamin D and sunlight. Vitamin D is also found in a small number of foods.

Detailed explanation-2: -Many people can produce enough vitamin D by spending roughly 30 minutes in the sun a few times a week, but that isn’t true for everyone. The amount of vitamin D the body produces in the sun varies from person to person and depends on your physical environment.

Detailed explanation-3: -Vitamin D production in the skin is the primary natural source of vitamin D, but many people have insufficient levels because they live in places where sunlight is limited in winter, or because they have limited sun exposure due to being inside much of the time.