When should I avoid taking pre-workout?

Author: Prof. Rudy Heathcote  |  Last update: Sunday, May 4, 2025

As mentioned, you should drink your pre-workout 20-30 minutes before training and make sure you don't consume your pre-session energy boost within 4 hours of bedtime, as this could affect your ability to sleep.

When should you not take pre-workout?

It is recommended that you stop taking pre-workout supplements at least 30 minutes before going to the gym. Everyone's body is different, so it is best to consult with your doctor before taking pre-workout supplements to ensure they are safe for you.

Are there any downsides to pre-workout?

Kidney and liver function: Although the research is mixed, some studies suggest that preworkout supplements can impair kidney and liver function. Ingredients to avoid: Athletes should also be cautious. Preworkout supplements often contain steroids and other ingredients banned by sports organizations.

What is the best time to take pre-workout?

Get your timing right - pre-workout is best taken 30-60 minutes before you start your training session. This is because caffeine (usually one of the main active ingredients) takes around 30 minutes to reach peak levels in your blood.

Why wait 30 minutes after pre-workout?

Most pre-workouts are designed to be taken around 30 minutes before exercising, as this allows enough time for the ingredients to be absorbed and kick in. This can differ by brand and product so check the instructions to make sure you're making the most of your pre-workout.

Pre-Workout Supplements: How To PROPERLY Use It To Boost Performance (Avoid Side Effects!)

How fast does PWO kick in?

TIMING OF YOUR PRE-WORKOUT

Typically, it takes a pre-workout between 30 mins to 90 mins to take effect. The greatest impact is seen 60 mins after taking caffeine and 60 to 90 mins after arginine consumption. To maximize the potential of a pre-workout, you want it to reach to their peak in your bloodstream.

Why can't you take pre-workout after 5pm?

Taking pre-workouts too close to bedtime can disrupt your sleep and wreak havoc with your routine– not great when the sole purpose of taking the stuff is for energy! To be on the safe side, always refer to the packaging to find out how and when to consume your pre-workout.

What happens if you take pre-workout without working out?

Curious about what happens when you take pre workout without working out? You'll likely experience a boost in energy and improved focus.

Is pre-workout good for weight loss?

Can Pre-Workout Help With Weight Loss? As stated above, while a pre-workout supplement likely won't trigger your body to burn more fat directly, it can help you accomplish fitness goals by boosting your workout performance.

Should beginners take pre-workout?

Should beginners take pre-workout? Pre-workouts can be useful for anyone looking to boost their performance. For beginners, they can be particularly good for getting through a session when you're not feeling your best, but it's best not to rely on them too much so early on in your training.

Can I take preworkout everyday?

But that doesn't necessarily mean you should add pre-workout to your daily routine. “Sometimes, more is not better; as the body can only tolerate a certain amount of various ingredients,” Dr. Lee says. Stangland says most pre-workouts are safe to consume once a day every day.

Does pre-workout affect sleep?

Your choice of pre workout can affect your sleep drastically. If you're trying to improve your sleep quality, try and reduce your pre workout intake at night by halving the dosage or if possible try working out in the morning so the effects of caffeine can wear out through the course of the day.

What to eat before the gym?

Good snack choices include:
  • An energy bar.
  • A banana, an apple or other fresh fruit.
  • Yogurt.
  • A fruit smoothie.
  • A whole-grain bagel or crackers.
  • A low-fat granola bar.
  • A peanut butter sandwich.
  • Sports drink or diluted juice.

Can I take pre-workout on an empty stomach?

Yes, you can take pre-workout on an empty stomach. Some people prefer to go several hours without eating or even fast the night before their workouts. While other people get their best results from eating a meal before workouts.

Should I drink pre-workout fast or slow?

This is especially helpful if you're using a high-caffeine pre-workout. Taking a “low and slow” approach makes it easier for you to avoid potential pre-workout side effects (insomnia, anxiety, jitters, digestive issues, etc.).

Is pre-workout a creatine?

Creatine is a common ingredient found in many pre-workout formulas, known for its ability to enhance high-intensity exercise capacity and promote gains in lean body mass through exercise. While typically included in pre-workout supplements, creatine can also be taken independently.

Should I take pre-workout if I'm fat?

Pre-workout on its own doesn't affect weight loss or muscle growth. “No pre-workout supplements burn calories or fat for you,” says Stronger U Nutrition dietitian Sinan Ozyemisci, MS, RDN. “It's just a tool to intensify the workout.”

How long does pre-workout take to kick in?

Generally, it takes anywhere from 30 minutes to 1 hour for pre-workout to take effect. With this in mind, it's always a rule of thumb to start mixing your pre-workout at about half an hour before getting your sweat on.

Is preworkout hard on the heart?

“Most pre-workout mixes are known to contain more than 200 milligrams of caffeine, the equivalent of two cups of coffee, which can improve energy levels but also increase the risk of high blood pressure, arrhythmias and potentially a heart attack in patients with severe coronary disease.”

How late is too late for preworkout?

What time is too late for pre-workout? With a five-hour half-life, it's best to avoid taking caffeine past the early afternoon. Any amount of caffeine can disrupt your sleep, and you want to give your body time to eliminate as much caffeine as possible before bedtime.

What's the best post-workout drink?

The bottom line

Hydrating after workouts is essential for recovering from exercise. Plain water is a great choice to replace lost fluids after moderate exercise. But other options, such as milk or tart-cherry juice, may offer additional benefits after high-intensity workouts.

What is the best workout at night?

Yoga is one of the best workouts you can do at night. Its deep stretching sessions and series of calming poses are perfect for unwinding and preparing your body for a good night's rest. Try the Child's Pose to release tension in your lower back, especially after a long day of sitting.

Is it better to drink a protein shake before or after a workout?

The short answer: Many experts suggest having protein after a workout to build muscle mass. But preworkout or postworkout protein may help. Strenuous exercise creates microtears in the muscles. After a workout, your body repairs the damage using amino acids from dietary protein.

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