Of all the lab tests I run in my clinic, vitamin D and vitamin B12 are among the most common problems. Last month the ministry of health in the UAE acknowledged that in a country bathed in sunshine, vitamin D levels are clinically low across most age groups, genders and ethnic origins. Vitamin B12 is also a concern for vegetarians and particularly vegans, picky eaters, and in people with digestive disorders and auti-immune dysfunction. It is an invisible epidemic estimated to affect about 40% of elderly people with research highly supporting its links with Alzheimers, cognitive decline and memory, cardiovascular disease, multiple sclerosis and other neurological diseases. Much of this research has further moved into the similarities of these diseases in children to affect learning and developmental disorders, autism, autoimmune disease, cancer and fertility. Both of these nutrients have been missed in the past firstly because they were not routinely tested by most physicians and secondly, the laboratory reference ranges were too low.