Pre-Workout Without the Crash: What to Take Before Training

Pre-workout powders promise focus and energy for a session, and many people pay for it a few hours later with a slump, a restless night or a headache the next day. Most of that comes down to one ingredient, caffeine, taken in the wrong dose or at the wrong time.

This guide sets out how much caffeine the training research uses, what lower doses can do, when to take it, which other pre-workout ingredients have evidence behind them, and what to take for morning, endurance, after-work and evening sessions.

Caffeine has the strongest single-session evidence of any pre-workout ingredient. Doses of 3 to 6 mg per kg of body weight (1.4 to 2.7 mg per lb) about 60 minutes before training reliably improve performance, and lower doses of about 1.5 mg per kg, around 100 mg for most adults, improved endurance performance in trials when taken late in long sessions. The crash most likely comes from a dose larger than you need, caffeine taken too close to bed, training without enough food, or skipping your usual caffeine. Creatine and beta-alanine work through daily use, so their timing before a session matters little.

What causes the pre-workout crash?

There is very little research on a post-workout crash as its own effect, but its four likely causes have each been studied.

• A dose larger than you need. The average top-selling pre-workout contains 254 mg of caffeine per scoop. For a 70 kg (154 lb) adult that is about 3.6 mg per kg (1.6 mg per lb), which is inside the range used in research. The trouble starts with scoops that contain far more, or a scoop on top of the day's coffee. The International Olympic Committee (IOC) consensus on supplements notes that doses of 9 mg per kg or more add no extra benefit and make nausea, anxiety, insomnia and restlessness more likely.
• Lost sleep. A 2023 meta-analysis of 24 studies found caffeine cut total sleep by 45 minutes on average. A short night makes the next afternoon feel like a crash, even after the caffeine has worn off.
• Training on empty. A 2020 review of pre-exercise nutrition found that eating carbohydrate beforehand improves performance in longer sessions, with little effect on short ones. A hard 90-minute session on a coffee and nothing else can leave you flat afterwards.
• Skipping your usual caffeine. In a 2019 study of 87 regular coffee drinkers, those who unknowingly received decaf reported more withdrawal symptoms and did worse on cognitive tests, with headaches appearing after about 24 hours without caffeine. Daily pre-workout users can feel the same on days they skip it.

How much caffeine do you need before training?

According to the International Society of Sports Nutrition (ISSN), doses of 3 to 6 mg of caffeine per kg of body weight (1.4 to 2.7 mg per lb) reliably improve performance, and the minimum effective dose may be around 2 mg per kg (0.9 mg per lb). A review of 21 meta-analyses found caffeine improved aerobic endurance, muscle strength, muscular endurance, power, jumping and speed, with effects ranging from small to moderate and generally larger for endurance work.

The lower end of the range is where most people should start. For a 70 kg (154 lb) adult, 3 mg per kg is about 210 mg, roughly two cups of coffee, and the authors of that review suggest this amount about 60 minutes before exercise as a practical guide. Lower doses taken during long sessions also work, as the next section shows.

The low dose matches the amount given late in exercise in the trials described below. The European Food Safety Authority (EFSA) considers single doses up to 200 mg safe for healthy adults, including less than 2 hours before intense exercise in normal conditions, and up to 400 mg a day from all sources. The top of the standard range goes past the 200 mg figure at every weight in the table, and past the daily figure above about 67 kg (147 lb).

Regular coffee drinkers still benefit. In a 2017 study of 40 trained male cyclists grouped by habitual intake (about 58, 143 and 351 mg a day), 6 mg per kg of caffeine improved a 30-minute time trial to the same degree in all three groups. Daily use does wear the effect down. When 11 active adults took 3 mg per kg every day for 20 days, peak cycling power rose about 4 percent for the first 15 days, and then the benefit progressively shrank.

Do low doses of caffeine work for training?

Yes, particularly when taken late in a long session. Doses under 3 mg per kg (about 200 mg) have been studied less than larger ones, but a 2014 review concluded they improve performance in some exercise situations, sharpen alertness and mood during and after exercise, and come with few if any side effects.

In a 2016 trial, 15 trained cyclists rode for 2 hours and then completed a time trial. A drink containing 100 mg of caffeine (about 1.5 mg per kg) given after 80 minutes made the time trial about a minute faster than the placebo drink, 27:36 versus 28:41 minutes. A 200 mg dose brought it down to 26:36. In an earlier 2002 study, switching to cola late in a 2-hour ride, which delivered only about 1.5 mg of caffeine per kg, improved time-trial performance by about 3 percent, a similar gain to 6 mg per kg taken an hour before the ride. In both studies the caffeine came with carbohydrate. The IOC consensus puts the gain from 100 to 300 mg taken during endurance exercise at 3 to 7 percent.

This is the dose range ARK Melts are built around. One ARK Melts Extra Strong melt contains 100 mg of caffeine and 60 mg of L-theanine, the same caffeine dose as the low-dose arm of the 2016 trial, and ARK Melts Original contains 50 mg of caffeine and 50 mg of L-theanine. Both are placed on the tongue and dissolve without water, so they are easy to take at the start of a warm-up or partway through a session, when a coffee or a capsule is impractical. Part of the caffeine is absorbed through the lining of the mouth, the route that brought caffeine into the blood faster than capsules in chewing-gum studies. No absorption study has yet been run on a dissolvable strip itself, so strip timings are based on the gum research, as our article on sublingual caffeine explains.

When should you take caffeine before a workout?

About 60 minutes before training is the timing used in most studies, because swallowed caffeine takes about that long to approach its peak. The ISSN notes that the best timing depends on the source, and formats absorbed in the mouth may need less waiting.

In a 2013 study, eight male cyclists chewed 300 mg of caffeine gum either 120, 60 or 5 minutes before a time trial, and performance improved only when the gum was chewed 5 minutes before. Melts use the same route through the mouth, so the start of your warm-up is a sensible time to take one.

Caffeine taken late in the day also costs sleep. The 2023 sleep meta-analysis estimated that a standard pre-workout serving of 217.5 mg should be taken at least 13.2 hours before bed to avoid losing sleep, and a 107 mg coffee, about the same caffeine as one ARK Melts Extra Strong melt, at least 8.8 hours before. Someone who trains at 6 p.m. and sleeps at 11 p.m. has 5 hours, well short of either figure.

Do the other pre-workout ingredients work?

A few do, but mostly when taken daily over weeks, and often in larger amounts than a typical scoop provides. An analysis of the 100 top-selling pre-workouts found the most common ingredients included beta-alanine (87 percent of products), caffeine (86 percent), citrulline (71 percent) and creatine (49 percent). About 44 percent of all ingredients sat inside proprietary blends, which list ingredients without their amounts, and the average beta-alanine dose was below the effective level.

Creatine

Creatine is one of the best-supported supplements for strength and repeated high-intensity efforts, and it works by building up in the muscle over days. The IOC consensus describes 3 to 5 g a day as the maintenance dose, with an optional loading phase of about 20 g a day split into four doses for 5 to 7 days. Its clearest effects are on efforts lasting under 30 seconds, along with greater strength and lean mass gains over a training programme. Because it works through creatine stored in the muscle, taking it every day matters far more than taking it right before a session.

Beta-alanine

Beta-alanine causes the pre-workout tingle, and its benefit comes from daily use over weeks. The ISSN found that 4 to 6 g a day for at least 2 to 4 weeks raises a natural buffer in muscle that delays fatigue in hard efforts, and improves performance most clearly in all-out efforts lasting 1 to 4 minutes. The IOC puts the likely gain at about 0.2 to 3 percent. Tingling skin is the main side effect, and splitting the daily amount into doses of about 1.6 g reduces it. One scoop before a session produces the tingle, while the performance effect needs the weeks of daily use.

Citrulline

Citrulline is marketed for blood flow and the pump, and its effect on performance is small. A 2019 meta-analysis of 12 studies (198 participants) found a small benefit for strength and power in studies that gave at least 3 g at least 30 minutes before exercise. A 2020 review found little consistent evidence that it improves blood flow to the muscles.

Beetroot (dietary nitrate)

Nitrate from beetroot juice and leafy greens gives a small performance boost in recreationally active young men. A 2020 meta-analysis of 80 studies found a small overall effect, with no clear benefit in well-trained endurance athletes or in the six studies that included only women. The IOC says benefits generally appear 2 to 3 hours after a dose of about 310 to 560 mg of nitrate, so it needs to be taken well before a session.

Quick comparison: pre-workout ingredients and what the research shows

Doses and timings are those used in the cited studies and position stands. Individual responses vary widely, and anything new should be tried in training before a race or competition.

Natural pre-workout alternatives

The ingredients with the best evidence are all available without a scoop, and with each of these you know exactly how much you are getting.

• Coffee. A 250 mL (8.5 fl oz) cup of brewed coffee averaged 107 mg of caffeine in the 2023 sleep analysis, so one or two cups about an hour before training covers the lower end of the research range for most adults.
• Caffeine melts or gum. Formats absorbed in the mouth can be taken at the start of a warm-up or during a long session without water. ARK Melts Extra Strong gives 100 mg of caffeine per melt and ARK Melts Original 50 mg, both with L-theanine.
• Beetroot juice. The main natural source of dietary nitrate, taken 2 to 3 hours before an endurance session.
• A carbohydrate snack. For longer sessions, eating carbohydrate beforehand, such as a banana or toast, improves performance and helps avoid the flat feeling of an under-fuelled workout.

Everyday caffeine sources such as green tea, matcha and yerba mate are compared in our natural energy drink alternatives article.

What to take before training, by session

Early morning session

Morning is the easiest time to use caffeine well, since there is a full day for it to clear before bed. A coffee about an hour before, or an ARK Melts Extra Strong melt at the start of your warm-up, covers most needs. The melt dissolves on the tongue without water, which suits people who train before breakfast.

Long run, ride or endurance session

For sessions of around 2 hours, the trials support splitting caffeine into a dose before and a small top-up late in the session. A practical version is one ARK Melts Extra Strong melt at the start and an ARK Melts Original melt in the last 40 minutes, taken alongside your usual carbohydrate drink or gel. That keeps the total at 150 mg, inside the EFSA single-dose figure.

After-work session

This is the session where dose matters most, because caffeine taken at 5 or 6 p.m. can still cost sleep that night. Keep to a low dose such as one ARK Melts Original or Extra Strong melt, count any coffee you have already had that day, and eat something an hour or two beforehand if the session is long. Each melt pairs caffeine with L-theanine, a combination covered in our caffeine and L-theanine ratio article.

Evening session

For training within a few hours of bed, a caffeine-free routine is the option most likely to protect your sleep. Creatine can be taken whenever suits you, a carbohydrate snack covers fuel, and ARK Drops, a caffeine-free peppermint formula taken under the tongue, can act as a pre-session cue without a stimulant. The research on menthol and exercise is covered in our menthol article.

Heavy lifting day

For strength work, the best-supported combination is caffeine before the session and creatine every day. Citrulline adds a small effect at best. An ARK Melts Extra Strong melt at the start of your warm-up gives 100 mg of caffeine. Low doses have been studied less for strength and sprint work than for endurance, so lifters chasing the full effect may need a dose nearer the standard range, while staying within the EFSA figures.

How to avoid the crash: a practical checklist

• Start low. About 1.5 to 3 mg per kg (0.7 to 1.4 mg per lb) covers the low-dose trials and the lower end of the standard range.
• Check the label. If caffeine sits inside a proprietary blend, you cannot know your dose.
• Count every source. Coffee, energy drinks, melts and pre-workout all add to one daily total, which EFSA and the US Food and Drug Administration (FDA) both put at 400 mg a day for most healthy adults.
• Set a caffeine cut-off well before bed, and switch to caffeine-free options for evening sessions.
• Eat before long sessions. Carbohydrate beforehand helps longer efforts, and an under-fuelled session feels worse afterwards.
• Save larger doses for the sessions that matter. Daily use wears the effect down within a few weeks.
• Keep your daily caffeine steady. Skipping it on rest days can bring on withdrawal headaches.
• Take creatine daily, at whatever time suits you.

Is pre-workout safe?

For healthy adults, a correctly labelled pre-workout with a moderate caffeine dose appears relatively safe, but most safety studies are short. A 2018 review of multi-ingredient pre-workouts found they may improve muscular endurance and mood, with mixed results for strength and power, and noted that most safety studies lasted under eight weeks. The same review warned that some formulations contain banned substances, either as ingredients or as contaminants, which matters for anyone in tested sport.

Pure or highly concentrated caffeine powders are the clearest danger. The FDA warns that rapid consumption of around 1,200 mg of caffeine, less than half a teaspoon of pure caffeine, can cause toxic effects such as seizures.

This article is for general information and not medical advice.

Frequently asked questions

How much caffeine should I take before a workout?

Doses of 3 to 6 mg per kg of body weight (1.4 to 2.7 mg per lb), taken about 60 minutes before exercise, reliably improve performance. Lower doses of about 1.5 mg per kg, around 100 mg for most adults, have also improved endurance performance when taken late in long sessions. The European Food Safety Authority considers single doses up to 200 mg safe for healthy adults, including before intense exercise.

Why do I feel tired a few hours after pre-workout?

There is little research on a post-workout crash as such, but the likely causes are well studied: a dose larger than you need, poor sleep from caffeine taken too late, training without enough food for a long session, and caffeine withdrawal on days you skip your usual intake. A smaller dose, an earlier cut-off, a pre-training snack and a steady daily intake address all four.

Does a low dose of caffeine work for exercise?

Yes, in several trials. In a 2016 study of 15 trained cyclists, 100 mg of caffeine given after 80 minutes of a 2-hour ride made the time trial that followed about a minute faster than placebo, and 200 mg made it about two minutes faster. A 2014 review found low doses also improve alertness and mood, with few if any side effects.

Why does pre-workout make my skin tingle?

The tingle usually comes from beta-alanine, which 87 percent of top-selling pre-workouts contain. It is harmless in healthy people at recommended doses and can be reduced by splitting the daily amount into doses of about 1.6 g. The performance benefit needs 4 to 6 g daily for at least 2 to 4 weeks, so the tingle on its own is no sign that it is working.

Do I need pre-workout if I already drink coffee?

If caffeine is what you want from it, coffee covers that. Caffeine has the strongest single-session evidence of the common pre-workout ingredients, and a study of 40 trained cyclists found it improved time-trial performance by a similar amount in low, moderate and high habitual caffeine users. Count the coffee toward your daily total so you do not double up.

Is it better to take creatine before or after a workout?

Creatine works by building up in your muscles over days, so taking it consistently matters more than the exact timing. The usual amount is 3 to 5 g a day, with an optional loading phase of about 20 g a day split into four doses for 5 to 7 days.

Sources

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By Dina Rogonja