The same is true for vitamin D levels. Clinicians should not suggest high intakes of vitamin D (5,000 IU for example) before recommending the 25-OH vitamin D test. Health care professionals need ...

“Often, I recommend 5,000 IU [of vitamin D per day] for anyone with levels below 50 and 1,000 to 2,000 ... As a runner, you may think you’re safe from vitamin D deficiency, especially if you often run ...