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Vasodilatation Relaxation or widening of the blood vessels; leads to a lowered blood pressure.

Vitamin D Also referred to as calciferol; comprises a group of fat-soluble seco-sterols. The two major forms are vitamin D2 and vitamin D3 (both vitamin D2 and vitamin D3 can be synthesized commercially and may be found in dietary supplements or fortified foods; they differ only in their side chain structure).

Vitamin D2 Also referred to as ergocalciferol; originates from plants and is found in the human diet.

Vitamin D3 Also referred to as cholecalciferol; is synthesized in the skin of humans from 7-dehydrocholesterol and is also consumed in the diet via the intake of animal-based foods.

Vitamin D–resistant rickets An inherited form of rickets characterized by high concentrations of phosphate in the blood due to defective renal tubular reabsorption of phosphate and subnormal absorption of dietary calcium.

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