Lactase
Lactose digestion & dairy tolerance
14 Enzymes compounds, 9 at evidence level A, average absorption 81%. Forms differ mostly in how much of the dose actually reaches you, not in what they do.
Lactase leads at 95% 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.