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Vitamin D

Also known as Vitamin D3, Cholecalciferol, Calcifediol

What it is: Fat-soluble vitamin and hormone precursor
What it does: Supports calcium absorption, bone mineralization, and immune function
Status: Widely used supplement
Evidence: High. Extensive human data.
Uses: Bone health; immune support; general wellness

Caution. Excess can cause hypercalcemia; dose should consider blood levels and sun exposure.

Summary

Vitamin D is a fat-soluble vitamin that functions as a hormone precursor, supporting calcium absorption, bone mineralization, and immune modulation. It is commonly supplemented to address insufficiency, especially in people with limited sun exposure. Dosing is often guided by blood levels, and very high intakes can lead to hypercalcemia, so it needs to be used thoughtfully.

Checked Jul 19, 2026.

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This entry summarises published information in plain language. It is not medical advice, a dosing recommendation or a substitute for a qualified healthcare professional. Many peptides are not approved for human use, and legal status varies by country. Check anything you rely on against primary sources.