Vero Beach, Fl. - Due to the current situation with the pandemic, vitamin D has been in the news a lot the last few years. Vitamin D has been isolated as a major factor in our immune response to antigens. Antigens are anything our body recognizes as being foreign and a possible invasion to our immune system. Viruses, bacteria, or even pollens can be considered an antigen. Our immune system goes into defense mode when there is an invasion of a bad, foreign substance. Vitamin D is a key element to this defense mechanism. The RDA is 600 iu for people up to 70 years old and 800 iu for those over 70. I believe your intake should depend on what your Vitamin D blood levels are. You should consult your doctor to add this test into your next round of blood work to see what your level is. After that, your medical doctor can determine how much of this vitamin to take. Dr. Thomas Harmody is the owner and a chiropractor at Vero Walk-In Chiropractic.