Supplement linked to 42% lower MS risk

A higher intake of vitamin D from food and supplements was linked to a lower risk of developing multiple sclerosis (MS) among women in Norway, according to a large long-term study.

Researchers found that women with higher vitamin D intake had a 42 percent lower risk of developing MS compared with those who consumed less. The results were similar whether vitamin D came from food or supplements, suggesting vitamin D itself may play a role rather than sunlight alone.

Vitamin D is well known for supporting bone health, but it also helps regulate the immune system and supports brain and muscle health. The body produces vitamin D through sunlight exposure, but in countries such as Norway, sunlight levels are low for much of the year. This means people often rely more on diet and supplements to maintain healthy levels.

The study followed 78,074 women who took part in the Norwegian Mother, Father and Child Cohort Study between 2002 and 2008. Researchers used

detailed questionnaires to estimate vitamin D intake during early pregnancy. The women were then followed until 2022.

During the follow up period, 349 women developed MS. Those who developed MS had lower average vitamin D intake than those who did not. This was true for both dietary sources and supplements. After adjusting for factors such as age, body weight, smoking and education, higher vitamin D intake remained linked to a reduced risk of MS.

The researchers say the findings support the idea that vitamin D may help influence multiple sclerosis (MS) risk, particularly in areas with limited sunlight. They also noted that vitamin D deficiency is common worldwide, not just in northern countries.

While this research does not prove cause and effect, it adds to growing evidence that vitamin D may play a role in MS risk. Anyone considering supplements should speak with a healthcare professional to find what feels right for them.

If you would like to talk things through or explore reliable information about diet and supplements, the MS-UK Helpline is here to help. Call 0800 783 0518 weekdays between 10am and 4pm, email info@ms-uk.org or send us a WhatsApp message on 07824 708897.

Why not read our Diet and Supplements Choices booklet to read the latest evidence-based information for MS?