Their chemical structures are different.

Vitamin D (vitaminD) is a steroid derivative, and vitamin D3 is a fat-soluble vitamin.

The corresponding body needs are different.

The biggest effect of vitamin D is to fight cancer, and vitamin D3 is just a supplement to assist calcium absorption.

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Expanded profile:

Vitamins are a class of trace organic substances that must be obtained from food in order to maintain normal physiological functions in humans and animals, and play an important role in human growth, metabolism, and development.

Vitamins are neither involved in the composition of human cells nor in providing energy for the body.?

Vitamins are a class of organic compounds that are necessary to maintain good health.

These substances in the body can be neither raw materials for the composition of body tissues nor sources of energy, but are a class of regulatory substances that play an important role in the metabolism of substances.

Reference:

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