Other ingredients
Caffeine
Names you may see: caffeine anhydrous coffee stimulant
The quick take
Caffeine is a stimulant that can increase alertness and support performance in some types of exercise.
A closer look
What forms will I see on a label?
Labels may list caffeine anhydrous or caffeine-containing botanical extracts. Count caffeine from drinks, pre-workouts and other supplements together.
Why people use it
Chosen for alertness and a pre-workout lift, with endurance and exercise performance among the main goals.
These are common goals and marketing uses. The evidence section below explains what research supports.
What does the evidence tell us?
Performance benefits are reasonably well studied, particularly for endurance and certain repeated efforts. Response and tolerance vary between individuals.
What should I know before using it?
Caffeine can disrupt sleep and cause anxiety, palpitations or digestive upset. Avoid combining several stimulant products and follow age, pregnancy and health cautions on the label.
Sources & further reading
NIH Office of Dietary Supplements ↗
Content reviewed: September 30, 2026
General educational information. Follow the product label and seek individual advice when needed.