The one everyone knows, and the backbone of EXEC. Caffeine works by blocking adenosine, the compound that builds up over the course of a day and makes you feel tired. Block it, and the tired signal quiets down.

We chose 100 mg on purpose. It is about what you would get from a cup of coffee — a real, noticeable lift from a single pouch. It is also a clean unit to build a day around. One when you sit down to work. Another when the day picks up. The level is yours to set.

B6 is a workhorse. Your body uses it to turn the food you eat into usable energy, and it is part of how you build neurotransmitters like dopamine and serotonin — the chemistry behind how sharp and level you feel. It is water-soluble, so you do not store much of it. You run on what comes in.

At 1 mg you are getting a real dose in every pouch, sized to sit alongside the caffeine rather than compete with it.

B12 is what turns fuel into energy your cells can actually use. It works in the same metabolic pathways as B6, which is why the two belong together, and it is involved in red blood cell formation — the machinery that carries oxygen everywhere it needs to go. It also supports normal nerve function.

Caffeine gives you the immediate lift. B12 is the one working underneath it, on the systems that produce your energy in the first place. 2 mcg covers nearly the entire daily value in a single pouch.

L-theanine is an amino acid found naturally in tea leaves — part of why a cup of tea feels different from a cup of coffee. It is thought to cross into the brain, where it works alongside caffeine.

Caffeine and L-theanine have been tested together in multiple controlled trials, where the pair improved attention-switching and alertness. 100 mg matches the L-theanine dose used in key studies. See the research.