Vitamin D for Runners, Cyclists & Endurance Athletes
For runners, cyclists and endurance athletes, vitamin D belongs in the health foundations behind consistent training. It contributes to normal muscle function, normal bones and normal immune-system function—without replacing a sound fuelling, hydration and recovery plan.
Why athletes should pay attention to vitamin D
Training makes everyday nutrition more important, not less. Vitamin D contributes to normal muscle function and normal bones, while its contribution to normal immune function is particularly relevant during demanding winter blocks.
Winter training in the UK
From October to early March, UK sunlight is generally insufficient for the body to make enough vitamin D. Indoor sessions, early starts and reduced daylight can make a consistent supplement routine a practical option.
Runners, cyclists and triathletes
Runners and triathletes place regular demands on the musculoskeletal system; cyclists may spend long periods training indoors through winter. All benefit from treating nutrition as a foundation: energy availability, carbohydrate, protein, hydration, sleep and appropriate micronutrient intake.
Enduro D for active adults
Enduro D provides 50 µg (2,000 IU) vitamin D3 plus vitamin K2 as MK-4 and MK-7. Vitamin K contributes to the maintenance of normal bones.
Read Vitamin D in Winter UK, Why Take D3 + K2? and our Winter Immune Support guide.
Frequently asked questions
Does vitamin D replace sports nutrition?
No. It supports normal body functions as part of a varied, balanced diet and healthy lifestyle; it does not replace carbohydrate, fluids or recovery nutrition.
When should athletes take vitamin D?
Take it consistently, ideally with a meal containing some dietary fat. See our timing guide.
Who should avoid vitamin K supplements?
Anyone taking warfarin or similar vitamin-K-sensitive anticoagulants should seek specific advice from their healthcare professional before using vitamin K supplements.
Bottom line
Keep vitamin D in the everyday routine that supports winter training. Shop Enduro D →
