Vitamin D-the sunshine vitamin may provide protection from cancer, osteoporosis, high blood pressure as well as reducing inflammation. Feeling tired, muscle pain and/or general fatigue?..it may be low D levels. Very few foods in nature contain vitamin D....the best sources are things we do not eat alot of...salmon, tuna, mackerel, beef livers & fish oils. Yum! If these foods don't sound very appealing...there is good news...Sun & Supplements. All it takes is about 15-20 mins. in the sun each day to get enough. This is time outside without sunscreen. If you are not willing to do this, or it's cloudy, supplements may be of benefit to you. As you know, I am not a big supplement pusher, but this seems to be an area that most can benefit from without the danger of toxicity. The current recommended dosage is 400-1,000 IUs/day of Vit. D3. It is inexpensive to buy and no aftertaste! If you are curious about your Vit. D levels, ask your MD for a Vit. D3 blood test. I recently had mine tested and was at the lowest end of the range...I was surprised since I have been taking it regularly. You can work with your MD to figure out the best dose for yourself. Enjoy the sunshine!