Maffei, M. (2020). 5-Hydroxytryptophan (5-HTP): Natural Occurrence, Analysis, Biosynthesis, Biotechnology, Physiology and Toxicology. Int J Mol Sci;22(1):181.https://pubmed.ncbi.nlm.nih.gov/33375373/
Wyatt RJ.et al. (1971) Effects of 5-hydroxytryptophan on the sleep of normal human subjects. Electroencephalogr. Clin. Neurophysiol; 30:505–509.https://pubmed.ncbi.nlm.nih.gov/4105646/
Rhonda, PP. and Ames, BN. (2015) Vitamin D and the omega 3 fatty acids control serotonin synthesis and action, part 2: relevance for ADHD, bipolar disorder, schizophrenia, and impulsive behaviour. The FASEB Journal.29 (6):2207-2222.https://faseb.onlinelibrary.wiley.com/doi/abs/10.1096/fj.14-268342
Bannai, M, et al. (2011). Oral administration of glycine increases extracellular serotonin but not dopamine in the prefrontal cortex of rats. Psychiatry and clinical neurosciences, 65(2), 142–149.https://pubmed.ncbi.nlm.nih.gov/21414089/
10) Bannai, M. et al (2012) The effects of glycine on subjective daytime performance in partially sleep-restricted healthy volunteers. Front Neurol; 3:61.https://pubmed.ncbi.nlm.nih.gov/22529837/
Saeed, M. et al. (2017) Green tea (Camellia sinensis) and l-theanine: medicinal values and beneficial applications in humans—a comprehensive review. Biomed Pharmacother.95:1260–75.https://pubmed.ncbi.nlm.nih.gov/28938517/
Dasdelen, MF. et al. (2022) A Novel Theanine Complex, Mg-L-Theanine Improves Sleep Quality via Regulating Brain Electrochemical Activity. Front Nutr; 9:874254.https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9017334/
Szewczyk, B. et al (2018).The role of magnesium and zinc in depression: similarities and differences.Magnes Res;31 (3):78-89.https://pubmed.ncbi.nlm.nih.gov/30714573/