LABORATORY MEDICINE, cilt.52, sa.3, ss.219-225, 2021 (SCI-Expanded)
Objective: Many studies have investigated lower 25-hydroxyvitamin D (25[OH]D) levels in patients with Alzheimer's disease (AD) compared with those in control patients. In the present study, we aimed to evaluate serum free and bioavailable 25(OH)D levels in patients with AD and in healthy control patients.