Vitamin D

Latest in Vitamin D

Sleep and Sunlight: Why Athletes Need to Prioritize Both

Seeking that extra edge on and off the field? Improving dietary and exercise habits are common New Year's resolutions, but athletes and non-athletes s...

By: Jim Carpentier

What to Look for in a Pre-Workout Supplement

Pre-workout supplements promise to transform your workouts. You'll be more energized, you'll smash weights like never before and you'll visit Swole Ci...

By: Andy Haley

The Scientific Reasons You Feel More Tired During Winter (And How To Combat It)

When the winter months hit, many of us feel the need to hibernate. Suddenly, getting out of bed in the morning is a Herculean task. Mid-day fatigue...

By: Brandon Hall

5 Most Common Nutritional Deficiencies in Athletes

Nutritional deficiencies can negatively affect how athletes perform. STACK talked to sports dietician Leslie Bonci to find out which macronutrients at...

By: Rob Scott

New Study Finds That Athletes Lacking This Elusive Vitamin Are Weaker, Slower and Less Explosive

A new study from the University of Tulsa has found that low levels of vitamin D can lead to a significant drop-off in athletic performance. The...

By: Brandon Hall

Latest Videos in Vitamin D

Jose Antonio Defines a Supplement

Former NSCA vice president and ISSN CEO Jose Antonio defines what a supplement is.