Could a tailored supplement boost nutrition while preserving Parkinson's drug power?

This trial tests whether a specialized amino acid supplement designed for people with Parkinson's disease can improve nutrition without interfering with their dopamine medication. Researchers will compare this supplement to a store-bought whey protein supplement and an inactive placebo. Participants, who are 55 or older and have been on stable dopamine medication for at least 3 months, will drink each supplement at separate visits. Blood samples will measure amino acid and levodopa levels, and researchers will also assess mood and movement.