Most shark attacks occur less than 100 feet from the shore. More people are killed by bee stings and lightning than by shark attacks. Worldwide about 30 people die each year from shark attacks, which means a person has a one in 300 million chance of being killed by a shark. A shark attack most often occurs when a shark mistakes a person for a seal or other animal.
The new 2010 recommended daily allowance (RDA) is 600 IU for those 1-70 years of age and pregnant or breastfeeding women, and 800 IU for those over 71 years of age. An adequate blood level of vitamin D is 20 nanograms per milliliter, which can be achieved through daily skin exposure to sunlight.
Vitamin D Testing. The most accurate way to measure how much vitamin D is in your body is the 25-hydroxy vitamin D test or 25(OH)D test. Vitamin D changes into an active form of the vitamin in the kidney and can be measured through a blood test. The normal range is 30.0 to 74.0 nanograms per milliliter (ng/mL).A lower level indicates vitamin D deficiency, which you should discuss with your doctor.he Vitamin D Council also recommends testing your vitamin D level again in 3 months if you were found to be insufficient or deficient on your first test. You can make changes in your sun exposure to increase your bodies production of vitamin D and/or take vitamin D supplements.