Vitamin D3
Bone health & immune support
58 Vitamins compounds, 35 at evidence level A, average absorption 82%. Forms differ mostly in how much of the dose actually reaches you, not in what they do.
Bone health & immune support
Immune support & antioxidant
Hair growth & nail strength
Autoimmune prevention & management
Energy & nerve support
Vitamin B8 (D-Chiro-Inositol) leads at 98% bioavailability. Absorption is the number that decides how much of the dose reaches you, so it matters more than the milligrams on the label.
They deliver the same active compound but differ in absorption, tolerance and cost per month. The cheaper forms are usually the ones absorbed least.