Skip to main content
​Does Pre-Workout Make You Poop?

​Does Pre-Workout Make You Poop?

Posted by Leonard Shemtob on Apr 24, 2023

Does Pre Workout Make You Poop?

The popularity of pre-workout supplements has been on the rise among both fitness enthusiasts and athletes. These products aim to boost energy, focus, and endurance during workouts. While many people benefit from using pre-workout supplements, some users report experiencing digestive issues, including the need to poop. In this article, we'll explore the potential reasons behind this phenomenon and provide tips for managing any digestive discomfort.

Digestive Effects of Pre-Workout Supplements



  1. Impact on the gastrointestinal system: Caffeine, a common ingredient in pre-workout and weight loss supplements, is known to stimulate the gastrointestinal (GI) system. It increases the production of stomach acid and speeds up digestion, which can lead to the need to poop.
  2. Laxative effects: Caffeine can also have a laxative effect for some individuals. This is due to the increased movement of the muscles in the colon, which can prompt bowel movements.

Other Stimulants

Some pre-workout supplements contain additional stimulants, such as synephrine or yohimbine, which may also contribute to digestive issues.

Some stimulant based supplements can have as much as 2-3 cups of coffee's worth of caffeine.

Artificial Sweeteners

Sugar Alcohols

Many pre-workout supplements use artificial sweeteners like sugar alcohols (e.g., xylitol, sorbitol) to add flavor without adding calories. However, these sugar substitutes can cause gas, bloating, and diarrhea in some individuals, especially when consumed in large quantities.

Impact on Digestion

Artificial sweeteners may also affect the balance of gut bacteria, which can lead to changes in digestion and bowel movements.

Dietary Fiber

Some pre-workout supplements contain added dietary fiber, which can have varying effects on bowel movements:

  1. Soluble and insoluble fiber: Soluble fiber can help slow down digestion, while insoluble fiber adds bulk to stool and speeds up its passage through the colon.
  2. Effects on bowel movements: Depending on the type and amount of fiber in the supplement, it could cause changes in the frequency or consistency of bowel movements.

Individual Differences and Responses to Pre-Workout Supplements

Sensitivity to Ingredients

Everyone's body reacts differently to pre-workout supplements. Some individuals may be more sensitive to certain ingredients, which can contribute to digestive issues.

Variations in Gut Microbiota

Our gut microbiota, the community of microorganisms living in our intestines, plays a crucial role in digestion. Differences in gut microbiota may affect how individuals respond to pre-workout supplements.

Personal Habits and Lifestyle Factors

Diet, exercise habits, and hydration levels can all influence digestion and bowel movements. These factors can also play a role in how pre-workout supplements affect your digestive system.

Tips for Managing Digestive Issues Related to Pre-Workout Supplements

Gradually Increasing Dosage

If you're new to pre-workout supplements or trying a new product, start with a smaller dose (half scoop). Gradually increase your dose to allow your body to properly adjust.

Trying Different Brands or Formulations

Not all pre-workout supplements are created equal. Experiment with different brands or formulations to find one that works best for your body and doesn't cause digestive issues.

Timing of Consumption

Give yourself enough time between consuming the pre-workout supplement and starting your workout. This may help reduce any potential digestive discomfort.

Hydration and Diet Considerations

Staying hydrated and maintaining a balanced diet can help support healthy digestion and minimize digestive issues related to pre-workout supplements.

Other Potential Side Effects of Pre-Workout Supplements

While pre-workouts can provide many benefits, they may also cause some side effects. It's essential to be aware of potential pre workout side effects and monitor your body's reaction when using these products. Some common side effects include:

Increased Heart Rate and Blood Pressure

Stimulants like caffeine and other ingredients found in pre-workout supplements can increase heart rate and blood pressure. This may not be suitable for individuals with pre-existing heart conditions or those sensitive to stimulants.


The stimulants in pre-workout supplements can interfere with sleep, especially when consumed later in the day. To avoid sleep disturbances, it's best to take pre-workout supplements at least several hours before bedtime.

Jitters and Anxiety

High doses of stimulants may cause feelings of nervousness, jitters, or anxiety in some individuals. If you experience these side effects, consider reducing the dosage or trying a stimulant-free pre-workout supplement.


Some ingredients in pre-workout supplements, like caffeine, can have diuretic effects, increasing the risk of dehydration. To reduce this risk, make sure to drink plenty of water before, during, and after your workouts.

Tingling Sensations

Beta Alanine, a common ingredient in pre-workout supplements, can cause a tingling sensation in the skin, called paresthesia. This side effect is generally harmless and temporary, but it may be uncomfortable for some users.

Upset Stomach

Some individuals may experience stomach discomfort or digestive issues after consuming pre-workout. To minimize these side effects, try taking the supplement with a small meal or adjusting the dosage.


While pre-workout supplements can be helpful for enhancing exercise performance, some individuals may experience digestive issues, including the need to poop. Factors such as stimulants, artificial sweeteners, and dietary fiber in these supplements can contribute to these effects. It's essential to consider individual differences, personal habits, and lifestyle factors when evaluating the impact of pre-workout supplements on one's digestive system.

By understanding the potential side effects, gradually increasing the dosage, trying different brands or formulations, paying attention to the timing of consumption, and maintaining proper hydration and a balanced diet, you can minimize digestive issues associated with pre-workout supplements. Always consult a healthcare professional before starting any new supplement regimen, especially if you have pre-existing medical conditions or concerns about potential side effects. With proper research and care, you can find the pre-workout supplement that best suits your needs and supports your fitness goals.

Check out our Top 10 Pre-Workouts to find the overall best and highest rated pre-workout supplements based on user feedback!

Written and Sponsored by Leonard Shemtob

Leonard Shemtob is President of Strong Supplements. Leonard has been in the supplement space for over 20 years, specializing in fitness supplements and nutrition. Leonard appears on many podcasts, written over 100 articles about supplements and has studied nutrition, supplementation and bodybuilding. 

Leonard's articles have been published in many top publications around the web. Leonard enjoys weight training, playing basketball and yoga, and also enjoys hiking. In his free time he studies and works on improving himself. For more detailed information, visit his official blog.


Creatine is not commonly associated with causing bowel movements or the need to poop. However, some individuals may experience some gastrointestinal issues, such as bloating, gas, or stomach cramps as a side effect of creatine. These side effects are generally mild and can be managed by adjusting the dosage or using a different form of creatine, such as micronized creatine.
Amino acids, which are the building blocks of proteins, are not typically associated with causing the need to poop. However, some individuals may experience mild gastrointestinal discomfort or changes in bowel habits when taking amino acid supplements, especially in large doses or when taken on an empty stomach. This varies from person to person, and the effects may be temporary as the body adjusts to the supplement. If you experience digestive issues when taking amino acid supplements, consider adjusting the dosage, taking the supplement with a meal, or trying a different brand or formulation.

Related Articles

Read More About Pre-Workouts

View more