Participants will undergo blood and urine safety assessments at the beginning and end of each 6 week treatment period. During 4 of the 6 weekly visits in the treatment period with the injections, you will complete the cognitive tests twice; once before and once 2 hours after the injection. During 4 of the 6 weekly visits in the treatment period without the injections, you will also complete the cognitive tests twice; once before and once 2 hours after being asked to lie down onto a table for 5 minutes. You will be allowed to continue your standard of care for Alzheimer's disease throughout your participation in the study.