Your immune system works tirelessly every day, fighting off bacteria, viruses, and other threats to keep you healthy. While you can't control every exposure to illness, you have tremendous power to strengthen your body's natural defenses through daily choices. An immune-boosting lifestyle isn't about extreme measures or expensive supplements. It's built on four fundamental pillars that work together to keep your immune system functioning optimally: regular movement, nutritiou

Feeling tired all the time is a drag, isn't it? You get a full night's sleep, but you still feel like you could nap at your desk. You might chalk it up to stress or a busy schedule, but it could be something more: a vitamin D deficiency. This is a much more widespread issue than people realize. It is estimated that over a billion people worldwide have low vitamin D levels and may not even know it. Understanding what a vitamin D deficiency is and what it does to your body is t