All these nutritional supplements are easy to buy. They are available over the counter. For example, as fitness supplements. These are nutritional supplements with a very similar effect to benzodiazepines, but without all the negative effects. Agonist on inhibitory GABA receptors, or receptors with the same/similar function, glycine receptors. Agonists on glycine receptors.
Carnosine protects against NMDA-induced neurotoxicity in differentiated rat PC12 cells through the carnosine-histidine-histamine pathway and H(1)/H(3) receptors https://pubmed.ncbi.nlm.nih.gov/17169331/
The therapeutic potential of carnosine: Focus on cellular and molecular mechanisms https://www.sciencedirect.com/science/article/pii/S2590257123000019
Role of β-Alanine Supplementation on Cognitive Function, Mood, and Physical Function in Older Adults; Double-Blind Randomized Controlled Study https://pmc.ncbi.nlm.nih.gov/articles/PMC9960300/