Vitamin D

Latest in Vitamin D

Your Vitamin D Supplement Probably Isn't Working. Here's How to Change That

The benefits of vitamin D for general health and athletic performance have been well-documented. Exogenous vitamin D supplementation is associated ...

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...

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...

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...

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...