He is the Co-founder and Chairman of O'Leary Funds and the co-founder of Softkey. He has also previously served as a business journalist on CBC 's The Lang and O'Leary Exchange with Amanda Lang and hosted Redemption Inc.ailed as Canada's business equivalent of Donald Trump, O'Leary is one of Canada's most prominent entrepreneurs, investors, and financial pundits.
When calcium is low and/or a person has symptoms of vitamin D deficiency, such as bone malformation in children (rickets) and bone weakness, softness, or fracture in adults (osteomalacia), 25-hydroxyvitamin D usually is ordered to identify a possible deficiency in vitamin D.
She explained that 25 OHD (hydroxyvitamin-D) is the chemical compound found in the body to make vitamin D, and that this is what your doctor will test for, to determine if you are low or deficient for vitamin D. Low vitamin D is considered when blood levels of 25 OHD fall below 32 nanograms per milliliter (ng/mL).