Overdoing vitamin D? on: July 09, 2022, 08:03:34 pm #1 People with MS commonly take megadoses of vitamin D3. This article doesn't mention this fact but does go into detail on reasons why too much vitamin D isn't such a good idea in general. From Medical News Today (July 8, 2022)--"Overdoing vitamin D": What happens if you overdose on vitamin D? A patient's cautionary tale A case study reports on the damaging physical and possibly lasting effects one man experienced after taking extremely high daily doses of vitamin D and other supplements. bit.ly Logged MS Speaks--online for 20 yearsSPMS, diagnosed 1980. Avonex 2001-2004. Copaxone 2007-2010. Glatopa (glatiramer acetate 40mg 3 times/week) 12/16/20 - 3/16/24.