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389 L-Tryptophan and 5-Hydroxytryptophan L-tryptophan, the amino acid precursor to serotonin in the intestines and brain, is an important mediator of communication between the gut and the central nervous system

Elevated basal glutamate and unchanged glutamine and GABA in refractory epilepsy: microdialysis study of 79 patients at the yale epilepsy surgery program

Sun X, Klingbeil O, Lu B, Wu C, Ballon C, Ouyang M, et al

All cells were cultured in an endothelial cell-specific medium for human umbilical vein endothelial cells, which was supplemented with 10% fetal bovine serum and 1% penicillin/streptomycin (PCM-H-040, ZQXZbio, China)

The regulatory details below come from public FDA records and reporting by NPR, US News, and NBC News