Vitamin D2 vs. Vitamin D3: What's the Difference?

July 12, 2026

When choosing a vitamin D supplement, you will see two forms: D2 and D3. Both raise your vitamin D levels, but D3 (cholecalciferol) is the form your own skin makes from sunlight, and research shows it tends to raise and maintain blood levels more effectively. That is exactly why Nutrovell chose D3.

Where the two forms come from

Vitamin D2 (ergocalciferol) comes from plant and fungal sources, while vitamin D3 (cholecalciferol) is the form produced in human skin and found in animal sources. In other words, D3 is the form your body already recognises.

Why D3 has the edge

After absorption, both forms are converted in the liver to 25-hydroxyvitamin D, the marker doctors measure. Studies consistently find that D3 raises and sustains those levels more efficiently than D2, particularly with less frequent dosing, so you get more dependable results from the same effort.

Absorbed with fat

Vitamin D is fat-soluble, so take it with a meal containing some fat for best absorption. Nutrovell delivers D3 in an oil-based softgel, which supports that absorption naturally.

Our high-potency D3

Nutrovell Vitamin D3 provides 10,000 IU of cholecalciferol per softgel, the body-ready form at a high strength for those with greater needs. Because it is high potency, use it with your provider's guidance on frequency, and count vitamin D from any other supplements toward your total.

The bottom line

Both D2 and D3 work, but D3 is the body's own form and raises your levels more effectively. Nutrovell Vitamin D3 10,000 IU delivers that superior form at a high strength, used sensibly with professional guidance, for dependable vitamin D support.