http://www.ncbi.nlm.nih.gov/pubmed/17171460 Oral zinc augmentation with vitamins A and D increases plasma zinc concentration: implications for burden of disease. Potocnik FC, van Rensburg SJ, Hon D, Emsley RA, Moodie IM, Erasmus RT. Source Department of Psychiatry, Tygerberg Hospital and Stellenbosch University, Stellenbosch, South Africa. Abstract A study evaluating zinc supplementation in patients with Alzheimer's disease yielded ...