Caffeine is a common compound associated with coffee and colas, while L-theanine is a natural amino acid found in tea leaves and mushrooms. Combining the two compounds in a nootropic stack or taking caffeine + l-theanine capsules has become more popular, offering a variety of potential benefits to your physical health and mental abilities.
Excellent product
Used the 100 caffeine / 200 L-theanine product. Works great. Long lasting throughout the day. I don't use in consecutive days to keep my caffeine tolerance down.