Element 10 of 37
Cholecalciferol
Vitamin D3
Bone & Immunity
What it does
Vitamin D acts more like a hormone than a vitamin: it helps your gut absorb calcium for strong bones and tunes your immune system. Your skin makes it from sunlight, but office life, sunscreen, and northern winters mean most people run low, and low D often reads as fatigue or low mood. D3 is the form that raises your levels most effectively.
The science
The highly bioavailable form of the sunshine vitamin, functioning more like a hormone to dictate calcium absorption, immune system modulation, and skeletal strength.
Most relevant for
Indoor workers, darker skin tones, northern climates, and low energy or mood.
Key references
Personalise your stack
General wellness information, not medical advice. Consult your healthcare provider before starting any supplement.