Is It Good to Have Caffeine Before a Workout?

Author: Dana Ryan
Is It Good to Have Caffeine Before a Workout

You may have heard that caffeine helps you stay awake, but did you know that it can also help you with exercise and sports? Caffeine is one of the most well-studied ergogenic aids, which are substances that help support athletic performance and physical activity.

Many athletes use caffeine to boost performance, especially before working out, training or playing sports.
In general, most people can benefit from taking caffeine before exercise.

Here are my top tips on caffeine and when and how to take it:

Caffeine Can Improve Training and Exercise

Caffeine works by stimulating the central nervous system, heart, muscles, and the centres that control blood pressure1. As a stimulant, it facilitates the body’s ability to use fat for fuel. For this reason, caffeine may help to extend endurance during strenuous exercise.

It also reduces the perception of fatigue, helping you stay motivated through sustained activities.

A moderate amount of caffeine, taken an hour before strenuous training or a competition, has been found to significantly increase performance as compared to a placebo, with the athletes affected by minimal side effects2. That said, it’s no wonder that caffeine use in sports is very common.

Caffeine Enhances Mental Focus and Alertness

Caffeine has also been shown to enhance mental focus, which can be extremely beneficial pre-workout. Caffeine stimulates the brain and contributes to clearer thinking and greater concentration.

Whether it is getting in the zone or making quick game-time decisions, caffeine can be very effective when playing competitive sports.

The Best Sources of Caffeine

Caffeine is found in many foods and beverages and can be obtained from a variety of sources, so how you get your caffeine is your personal preference!

Most commonly, people will get caffeine from coffee, tea, or a pre-workout supplement that may contain an effective source of caffeine like guarana seed. Keep in mind the calories when you consume caffeinated beverages like soda or energy drinks – they can add up quickly if you’re not careful.

How To Take Caffeine: Individuals Respond Differently

People’s sensitivity to caffeine can vary. Some will metabolise caffeine quickly, while others will metabolise it more slowly; some will show greater sensitivity to the stimulating effects of caffeine, while others need higher amounts to feel an effect3.

If you are just starting to use caffeine, it is best to start small and then add more if you need it. Avoid more than 200mg of caffeine in one serving (there is about 100mg caffeine in a standard 225mL coffee); and no more than 400mg in one day.

For maximum effectiveness, try consuming caffeine 15-30 minutes before starting a workout.


1 Dunford M, Coleman EJ. Ergogenic aids, dietary supplements, and exercise. In: Rosenbloom CA, Coleman EJ, eds. Sports Nutrition: A Practice Manual for Professionals. 5th ed. Chicago, IL: Academy of Nutrition and Dietetics; 2012:128.

2 Spriet L. Exercise and Sport Performance with Low Doses of Caffeine. Sports Med. 2014; 44(Suppl 2): 175–184.

3 Nehlig A. (2018) Inter-individual differences in caffeine metabolism and factors driving caffeine consumption. Pharmacol Rev. 70(2):384–41.

By Dana Ryan

PH.D., M.A., MBA,
Sports Performance & Education

Source: I Am Herbalife Nutrition