Vitamin D

Latest in Vitamin D

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

Essential Supplement Stack for Male Athletes of All Ages

Choosing whether to take supplements can be a tricky issue for most men because of all the conflicting information. Most athletes will have friends that...

By: Erick Avila