hi boo, lots of scientific reasons out there. have a read of my regimen thread 'orthomolecular biochemistry' for more info.
if we're talking about betaseron, from what i understand it is hard on the liver, and the liver needs all the help it can get in a case of ms.
zinc tends to be low in ms ('normal' yes, healthy no).
low zinc can result in liver issues.
liver can repair with zinc supplementation.
when zinc is replete liver functions better.
with adequate zinc the low uric acid level seen in ms (again, also 'normal' but not healthy) can normalize.
vitamin d3 absorption can improve.
i am speaking from having read a boatload of medical journals, formed hypotheses, and tested them on myself with bloodwork. supplementing so that my zinc level matched 'healthy controls' in research caused my uric acid to normalize (again that means it matches 'healthy controls' in research) and my d3 absorption more than doubled.
bahaha world without zinc https://www.youtube.com/watch?v=U1iCZpFMYd0