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Why Vitamin D Is Called a Steroid Hormone 

Vitamin D is a fat-soluble compound existing primarily as vitamin D2 (ergocalciferol) and vitamin D3 (cholecalciferol). Although commonly labeled as a vitamin and available in supplements, its function is far more complex, operating as a sophisticated signaling molecule. This creates a classification paradox because its structure and mechanism of action align closely with those of steroid hormones. Modern biology recognizes its primary function as a hormone that regulates physiological systems, despite the historical confusion over its name. 

Why It’s Still Called a Vitamin

The original classification of Vitamin D as a vitamin is purely a historical accident, reflecting the state of nutritional science in the early 20th century.

 A classic vitamin is defined as an organic compound required in the diet because the organism cannot synthesize it endogenously. Vitamin D initially fit this definition because a dietary source was necessary to prevent rickets when sunlight exposure was insufficient. However, the body can synthesize Vitamin D3 endogenously in the skin upon exposure to UVB light, which disqualifies it from the strict, modern definition of a vitamin. The name has simply persisted despite the later discovery of its hormonal synthesis and function.  https://scienceinsights.org/why-vitamin-d-is-called-a-steroid-hormone/

Sunny Reads's avatar

Thanks for this very important message, Doreen! I read Agent’s piece when it came out last year… I’m a subscriber. Nature provides our living bodies everything that it needs, thank God! Not man, who cannot be trusted. Your SuperStack is a great reminder of how NOT to poison and slowly kill ourselves. Peace and Love to you and yours. 🙏

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