According to a study presented in Edinburgh, U.K. noted that taking vitamin D3 can improve exercise performance and lower your risk of heart disease. In addition, there were a number of other benefits.

Adults taking vitamin D had lower blood pressure compared to those given a placebo, as well as having lower levels of the stress hormone cortisol in their urine. This is the hormone associated with stress.

Those who took vitamin D also cycled 30% further than before the start of their treatment. Now that the sun’s gone in you’ll need to take your daily dose in pill form to reap the benefits.

On a personal level, both with self and working with patients, I have noted and seen improvement in terms of overall endurance.