Researchers found that adequate sun exposure could prevent as many as 250,000 cases of colorectal cancer and 350,000 cases of breast cancer annually around the world. That’s 600,000 more cancer-free people! There are no simple guidelines that will tell you how much sun you actually need because it depends on your skin tone. The amount of sun exposure Caucasians need differ from that of African-Americans or Asians because the darker your skin is, the less likely it is that you will produce adequate vitamin D levels from sun exposure alone. You also can’t rely solely on oral vitamin D supplements because taking a vitamin D capsule is not the same as getting vitamin D the way your body was designed to produce it – by getting sunlight to strike your uncovered skin.