Vitamin D for walkers and hikers: Health benefits, deficiency, supplements, dose ranges and when 'more' isn't betterBy: Andrew Forrest - January 2026
Vitamin D for walkers and hikers in the UK: benefits for bones, muscles and immunity, who's at risk, how much to take (400 IU - 4,000 IU), D2 vs D3, sunscreen effects, food sources and safety - plus a simple winter plan.