F‑D3X Delivers 3 Times More Effective Vitamin D Support

F-D3X Calcifediol is a next-generation Vitamin D supplement that uses calcifediol, a more bioavailable form of Vitamin D3. Unlike regular Vitamin D3 (cholecalciferol), F-D3X delivers 3 times faster absorption, helping your body reach optimal levels of Vitamin D more efficiently.

Learn the difference between FERN-D and F-D3X