Me too! < 10K IUs per day is not enough for me.

Vieth explains that the vitamin D system of the human body is better suited to working with an excess of vitamin D rather than a shortage.

Z, would you agree that this is a case of 4K IUs not being effective (as reported) because it is being used up readily by locations of higher priority, leaving an inadequate supply of substrate to be effective at addressing the MS?