Vitamin D although it is a vitamin, it is also a very important hormone for calcium and bone metabolism. It is essential to have adequate amounts of vitamin D to ensure calcium absorption. Most of our vitamin D comes from sunlight. It is also in small doses available in certain foods such as tuna, salmon, or mackerel. Recently many foods have added vitamin D. You can see this as it will say fortified with vitamin D. Even with these fortified and natural foods you may not have enough vitamin D. Recently with our lifestyles and many of us working indoors to then go home and stay indoors, we have had a reduction in the amount of vitamin D we receive. Because of this some people may not even be aware that they may have a deficiency of vitamin D. The easiest way to find out is by having a blood test done. However some symptoms are muscle weakness, psoriasis, the flu, depression or schizophrenia. It is possible that the severity of an asthma attack be reduced by sufficient vitamin D. Even cardiovascular disease can be associated with an insufficient amount of vitamin D. Breast cancer risk may be reduced with proper levels of vitamin D. The results may vary with each individual. However it is good to know if you have sufficient levels of vitamin D. Consult your doctor today and find out if your levels are sufficient. Results vary by individual however vitamin D supplementation may be something beneficial for you!