Vitamin D is often referred to as the "hormone vitamin" because it acts like a hormone in the body after being converted from its inactive form.
Vitamin D is produced by the skin when exposed to sunlight and is also found in some foods and supplements. Once in the body, it undergoes a series of conversions, ultimately becoming calcitriol, the active form of vitamin D. Calcitriol then acts as a hormone, regulating calcium levels in the blood and playing a crucial role in bone health, immune function, and other bodily processes.
While vitamin D is not a true hormone in the same way as those produced by endocrine glands, its hormonal action makes it unique among vitamins.
