Should I take magnesium or vitamin D for arthritis?
The NHS recommends most UK adults take 10 micrograms of vitamin D daily from October to March because sunlight is inadequate — this is especially important for bone health with arthritis. Magnesium supplementation is only usually needed if you're deficient (rare unless you have specific conditions). If in doubt, get your GP to check both with a blood test.
Last updated 2026-07-04. This is general information, not a substitute for personalised medical advice.
Frequently asked questions
When would you pick Vitamin D (10 mcg daily)?
All UK adults in winter; anyone at risk of osteoporosis; steroid users.
When would you pick Magnesium?
Only if a blood test shows you're deficient, or on GP advice.
What should I be careful about?
High-dose vitamin D (>100 mcg/day) can be harmful. Stick to the NHS-recommended dose unless a doctor advises otherwise.