How much vitamin D should I take?

People with MS may need to take a daily vitamin D3 supplement, dependent on the amount of sun they are exposed to daily.

Your vitamin D level should be above 150nmol/L (60ng/mL in the USA).

For those with low levels in first testing, a vitamin D megadose is recommended. 

Summer months / warmer climates

  • 10-15 minutes, with sun on most of the skin, when the UV index is 7 (which is high) (more sun when there is less UV) 

You can check UV levels in your local area online. More about UV and sunlight.

Those who get less sun

  • 10,000 IU of vitamin D3 daily in winter
  • 5,000 IU of vitamin D3 daily in summer

The most you can take without risk of serious side effects is 10,000 IU per day.

Families of those with MS

  • 5,000 IU a day in winter for family members of people with MS
  • We suggest 5,000 IU as the maximum dosage 
  • Children will need proportionally smaller doses
  • We also advise taking vitamin D3 supplements during pregnancy