glad you found something here that piqued your interest, even if it was your own previous post!
from my perspective, the athletes who arrive at this site, with or without ms, must pay close attention to their altered nutritional requirements in comparison to 'average joe public'.
healthy athletes require more essential nutrition than others who exert themselves less. hence the sale of multivit/mins tailored to active lifestyles.
ms patients are typically short on nutrients that are not necessarily going to normalize readily, using daily maintenance intakes suitable for average healthy joe public. in ms, therapeutic intakes may be suitable.
athletes with ms are facing a double whammy - lower nutrient status typical of ms PLUS higher nutrient demands of physical activity.
i've helped non-ms athletes with other health problems, ms patients, and visitors worries that their symptoms indicate ms. across the board, my suggestions are the same:
track diet. compare daily intake of essential nutrients to recommended amounts for key nutrients, at first for regular joe public. look for existing gaps. upgrade nutrient density in diet as needed. then can review again for nutrients suspect in ms and/or high athletic activity
once you're up to speed for average joe, and ms dx, and activity level, maximize intakes from nutrient dense food sources. supplement if necessary to restore chronically depleted essential nutrients, or to ensure daily intakes meet your needs.
caution re supplements: nutrients do not act in isolation. if taken as single inputs, undesirable effects may occur. example: the SELECT study where isolated alpha tocopherol was used (with selenium) to see if cancer incidence would be reduced. the opposite happened and the study had to be cut short. in the full text, it is clear that taking alpha tocopherol disturbed the natural vitamin e ratios in subjects' blood. gamma tocopherol levels were suppressed, and cancer diagnoses increased. balancing of cofactors is key with many nutrients of concern for ms patients.
that said, supplements can obviously be done. a high quality multivit/min is a decent starting point. from there, any supplements taken at therapeutic levels can be researched for appropriate attention to balance and cofactors.
that's my 2c
lots of related posts here at TiMS: http://bit.ly/2n5ajmA