10mg — a small, separately-dosed amount for alertness.
Caffeine is the most-studied stimulant compound in nutrition science, well established for its short-term effects on alertness and energy.
At 10mg, Vigor Boost's caffeine dose is modest, roughly a tenth of a typical cup of coffee, intended as a mild lift rather than a strong stimulant hit.
Vigor Boost lists Caffeine as one of its nine named ingredients, alongside the natural caffeine that also comes from its Green Tea Extract.