Have you ever felt like you aren't productive in the morning until your morning cup of coffee or tea?
I'm talking about caffeine. It can have health risks if you overdo it, but this natural known stimulant and nootropic has been shown to improve thinking skills. It doesn't simply make you feel more alert: Caffeine also gives you more access to several chemicals (neurotransmitters) in your brain such as acetylcholine, which helps with short-term memory and learning.
References: https://pubmed.ncbi.nlm.nih.gov/20164566/
https://pubmed.ncbi.nlm.nih.gov/27612937/
https://pubmed.ncbi.nlm.nih.gov/23241646/
https://pubmed.ncbi.nlm.nih.gov/20182035/
