Vitamin D
Supports bone health, immune function and muscle power. Up to 40% of adults are deficient.
Why it matters
Vitamin D is unique among vitamins it functions more like a hormone, with receptors found in almost every tissue in the body. It is essential for calcium absorption, bone mineralisation, immune function, muscle function, and cell growth. The primary source for most people is sunlight, not food, which makes deficiency remarkably common worldwide.
For endurance athletes
Up to 40% of adults are deficient in vitamin D, and athletes are not immune particularly those who train indoors, train early morning or evening, train in northern latitudes, or have darker skin tone. Research links low vitamin D to increased injury risk, impaired muscle recovery, reduced muscle power output, and increased susceptibility to respiratory illness.
Signs of deficiency
- ·Fatigue and low energy
- ·Frequent illness
- ·Bone and muscle pain
- ·Slow recovery from injury
- ·Low mood
Best food sources
- ·Oily fish (salmon, mackerel, sardines)
- ·Egg yolks
- ·Fortified dairy products
- ·Fortified plant milks
- ·Sunlight exposure (primary source)
Track Vitamin D automatically
MOVE logs micronutrients from every food you eat and shows sport-specific context alongside your numbers.