Recognizing the 10 Indicators of Vitamin D Shortage

5. Your Skin is Naturally Darker

Whether you are just of a darker complexion or you are an outdoorsy type with a tan, the increased melanin in your system will decrease the amount of vitamin D you produce as a result of direct sunlight. Though it increases your protection from sunburn and hot weather exposure, melanin can make it very difficult to produce the daily recommended vitamin D levels, especially as you age and your need for vitamin D increases.

The recommended daily level of vitamin D is 600 IU for all ages, but for those over 70 that number increases to 800 IU, and in African Americans, it can take 10 percent longer to produce the same amount of vitamin D as a fair-skinned person. Sunscreen has the same effect as melanin slowing the process of vitamin D synthesis. This doesn't mean you can skip sunscreen, but just be aware you may need more exposure to reach the desired amount.