Smarter Better Faster nootropics digital book: https://livecortex.com/product/smarter-better-faster-nootropics-book/

Buy the Cortex FOCUS nootropic stack: https://livecortex.com/cortex-generation1-nootropic/

Head on over to the Cortex nootropics and performance blog: https://livecortex.com/blog

Relevant studies: https://www.ncbi.nlm.nih.gov/pubmed/27590480 – on increasing GABA quantities via cardio exercise.