The first key supplement of the "Core 4" is Vitamin D3. It is one of the most useful nutritional tools we have at our disposal for improving overall health.
Vitamin D3 has been shown to be vital for bone health, cancer prevention, blood sugar regulation, brain and heart health, both male and female fertility, and improving numerous auto-immune diseases. If these benefits alone are not enough, the main advantages of supplementing D3 for athletes are increased muscle force production via improved contractile response, (remove and) decreased damage to muscle proteins from exercise and better immune function.
If you have a severe vitamin D deficiency you may have pain in your bones and weakness, which may mean you have difficulty getting around. You may also have frequent infections. However, not everyone gets these symptoms.
If you think you may have vitamin D deficiency, you should see your physician, or have a blood test to check your vitamin D levels.
These vitamins are not expensive and if you want to have any hope of being "fit enough" Vitamin D3 is a non negotiable.
Check in tomorrow to hear about the great "sleeper"