Hi to all----- I have an inquiry on behalf of my father who has PD. My father is currently taking Senemet & Eldepryl. He began taking several nutrient supplements, namely GABA (gamma-amino butyric acid) and L-Glutamic acid (amino acid). According to PRESCRIPTION FOR NUTRITIONAL HEALING by Dr. James Balch and his wife Phyllis, the GABA functions "as a neurotransmitter in the central nervous system by stabilizing neuron activity", while the L-Glutamic "improves nerve impulse transmission". Does anyone have any experience with these? Could these be harmful to a PD patient taking the above mentioned medicines? Thanks for your replies, and I realize that this is chit-chat, not medical advice. He is curious beyond what his doctor knew about it. Joel Cooper [log in to unmask] Nashville, TN USA