Vitamin D: It's Not a Vitamin, It's an Essential Pro-Hormone

We call it Vitamin D by historical mistake. In reality, it's a steroid hormone that controls the expression of over 1,000 genes (about 5% of the human genome).
Vitamin D receptors are found in almost every cell in the body, from the brain to the immune system.

Why Are We All Deficient?

We are "indoor animals." We work in offices, commute by car, live indoors. When we go out, we cover up or use sunscreen (rightly so for the skin, but this blocks Vit D production).
Furthermore, with age, the skin becomes less efficient at synthesizing it from the sun.

The Benefits - Beyond Bones

Everyone knows it's needed for bones (osteoporosis prevention). But optimal levels are associated with:

• Enhanced Immunity: Modulates the immune response, reducing the risk of respiratory infections and autoimmune diseases.
• Mood: Low levels are correlated with depression and seasonal affective disorder (SAD).
• Metabolic Health: Deficiency is associated with a higher risk of insulin resistance.

How to Supplement - Safe Protocol

See our general supplement guide for context.

1. Test: Don't guess. Get a blood test (25-OH Vitamin D).
2. Form: Choose Vitamin D3 (Cholecalciferol), the active form, not D2.
3. Co-factors: Always take it with a fatty meal (it's fat-soluble) and pair it with Vitamin K2 (MK-7) and Magnesium (necessary to activate it).
4. Dosage: Varies enormously. For maintenance, 2,000-4,000 IU per day is common, but correcting a deficiency requires higher doses under medical supervision.

Don't wait until you break a bone to worry about Vitamin D. It's the cheapest life insurance that exists.