Aside from being great for the immune system, Vitamin D from the sun helps our bodies produce serotonin during the day, which improves our mood, and which at night turns into melatonin and helps us sleep. It prevents the calcification of the pineal gland by helping our bodies absorb calcium. Vitamin D also helps with weight loss by stimulating the production of MSH hormone. It prevents many chronic illnesses, brings down inflammation, is beneficial to the heart, and can even help prevent certain cancers.
Sun exposure is the best way to get vitamin D, and shorter sun exposure (15-20 min a day, 2-3 times a week) is sufficient. You will not produce more vitamin D by being in the sun longer. Your body will stop when it gets what it needs. If soaking up some sun is not an option, supplementing with vitamin D3 is important. Experts recommend taking 1,000 I.U’s per 25 lbs. of body weight, however for the most accurate dosage a blood test is the best option.