Dr. Somerville’s blog

Today is the first blog post in the new series The Two-minute Health Fact*, discussing vitamin D3, a substance that is critical to our health but missing in many of us. It is called a vitamin, but is a hormone. The reason it is not a vitamin is the body can produce it. When the skin is exposed to sunlight, the ultraviolet UVB part, it produces vitamin D3. This for most of us is our