Caffeine
A widely used stimulant included to support alertness and perceived energy.
Last reviewed 19 Sept 2026
What is it?
Caffeine is a naturally occurring stimulant found in coffee, tea and other plants, commonly added to pre-workout and fat-loss supplements.
Why is it used?
It is included to support alertness, focus and perceived energy during training.
How does it work?
Caffeine acts on the central nervous system, which may influence perceived alertness and fatigue.
Common uses
- Pre-workout focus
- Morning energy
- Endurance sessions
What does research suggest?
Research suggests caffeine may support alertness and certain aspects of exercise performance in some individuals. Responses vary widely.
Potential benefits
- May support alertness and focus
- May support certain types of exercise performance
- Fast-acting
Limitations
- Tolerance builds with regular use
- Can affect sleep if taken late
- Sensitivity varies significantly
Safety considerations
Caffeine can cause jitteriness, increased heart rate and sleep disruption in sensitive individuals. Limit intake and avoid late-day use. Consult a healthcare professional if unsure.
Who should be cautious?
- People sensitive to stimulants
- Those with heart conditions
- People who are pregnant or breastfeeding
- Anyone on certain medications
Common supplement forms
- Anhydrous caffeine (capsules/powder)
- Plant extracts (e.g. guarana, green tea)
Frequently asked questions
Is more caffeine better for performance?
Not necessarily. Beyond a moderate dose, additional caffeine may increase side effects without added benefit, and sensitivity varies.
Medical Disclaimer
This content is for general educational purposes only and is not personalised medical advice. Always consult a qualified healthcare professional before making changes to your diet, training or supplement use.
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