NeuroZen

1. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6836118/
2. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6024559/#B3-nutrients-10-00730
3. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3252722/
4. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5770524/
5. http://nutradvance.pt/wp-content/uploads/2016/04/Ref84.293.pdf

NeuroFocus

1. https://www.sciencedirect.com/science/article/pii/S001457930600545X
2. https://www.researchgate.net/publication/40679377_Evolution_of_the_Human_CNS_Cholineric_System_Has_This_Resulted_in_the_Emergence_of_Psychiatric_Disease
3. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5758353/#b105-ad-8-6-812
4. https://www.hindawi.com/journals/ecam/2015/615384/
5. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3991026/#:~:text=Adaptogens%20increase%20the%20state%20of,homeostasis)%20is%20attained%20the%20heterostasis.