Tested and written by Martin Ebner, certified personal trainer.
Formula and evidence last checked October 2026.
A lot of pre-workouts feel as though they were created by somebody who thinks an itchy face and a racing heart are signs of a productive session. Pre Lab Pro takes a calmer route.
Its headline ingredient is 80 mg of caffeine, around the amount you might get from an ordinary cup of coffee, paired with L-theanine and L-tyrosine for focus. It also contains beetroot powder, a blend of L-citrulline and glutathione, vitamins and a small amount of electrolytes.
That calmer approach suits me. I love coffee, but I don’t need my warm-up to feel like a small emergency. When I tested Pre Lab Pro, I replaced one of my usual two pre-workout coffees with a scoop. I felt a steadier supply of energy throughout the session and found it easier to hold my focus for longer.
That’s what I experienced. It doesn’t automatically prove every claim on the label, so I’ve separated what I felt from what the formula and research can genuinely support.
THE QUICK VERDICT
Pre Lab Pro is a good option for somebody who wants a moderate lift in energy and focus without the enormous caffeine hit found in many pre-workouts. The combination of caffeine and L-theanine is the strongest and most convincing part of the formula.
The physical-performance side is less clear. The amounts of L-citrulline and glutathione aren’t disclosed separately, while the beetroot powder doesn’t state how much nitrate it provides. That makes the claims about blood flow, power and endurance difficult to assess properly.
I enjoyed using it, it tasted good and the energy felt steady rather than aggressive. I’d consider it for focus, convenience and lower-caffeine training. I wouldn’t buy it purely for a bigger pump or expect it to transform an ordinary workout.
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PRE LAB PRO AT A GLANCE
Best suited to: People who want smoother energy and focus without an enormous stimulant hit
Less suited to: Anyone chasing the strongest possible pump or the cheapest source of caffeine
Caffeine: 80 mg per scoop
Serving size: One 13 g scoop
Servings per tub: 20
Flavour: Natural berry
Suitable for vegans: Yes
Third-party testing: Performance Lab states that it’s tested and validated by Informed Sport
Current one-off price: $59 when checked in October 2026
My verdict: A good focus-led pre-workout, but not the strongest all-round performance formula
WHAT HAPPENED WHEN I TOOK IT
Coffee has been my usual pre-workout for years. It’s cheap, tastes wonderful and does the job, so any supplement trying to replace it has to offer something useful.
When I tested Pre Lab Pro, I cut my usual two coffees down to one and added a scoop around half an hour before training. The effect wasn’t a dramatic surge. It was a more controlled lift that lasted through the session, with enough stimulation to feel switched on without completely taking over.
I also found it easier to maintain my focus when the workout ran longer or I was trying to train between clients. The berry flavour was pleasant, and it worked well when I didn’t fancy eating shortly before exercising.
This wasn’t a clinical trial. It was me training as I normally do, which is where most real supplement decisions are made. I could feel the difference in energy and concentration, but I couldn’t tell you from sensation alone whether the beetroot or citrulline added power, improved blood flow or accelerated my recovery.
That’s where the label and the research need to do some work.
WHAT’S IN PRE LAB PRO?
One scoop currently provides:
80 mg natural caffeine
160 mg L-theanine
400 mg L-tyrosine
2,200 mg Setria for Sport blend containing L-citrulline and glutathione
1,500 mg red beet powder
500 mg Himalayan pink salt, providing 200 mg sodium
Vitamin D3, riboflavin, vitamin B6, folate and vitamin B12
49.5 mg potassium
2.5 mg iron
There’s no beta-alanine, so you shouldn’t get the tingling sensation associated with many pre-workouts. It doesn’t contain creatine either. That isn’t necessarily a problem, because creatine is better treated as a consistent daily supplement than something you only take before training.
CAFFEINE, L-THEANINE AND L-TYROSINE
This is the part of the formula I find most convincing.
Caffeine can improve alertness and exercise performance, although responses differ enormously between people. Most performance research uses around 3 to 6 mg per kilogram of bodyweight, with possible benefits beginning closer to 2 mg per kilogram. At 80 mg, one scoop of Pre Lab Pro sits below those commonly studied amounts for most adults.
That’s also the point. It isn’t trying to launch you through the gym ceiling.
The 160 mg of L-theanine gives the formula a two-to-one ratio of L-theanine to caffeine. A systematic review of caffeine and L-theanine found possible benefits for attention and some aspects of mood, although the size and consistency of those effects remain uncertain.
The 400 mg of L-tyrosine may also support cognitive performance when you’re under stress, but the evidence for improving physical endurance is far less convincing. A systematic review of tyrosine and endurance performance found no meaningful improvement over a placebo.
Put simply, the focus stack makes sense. I’d be much more cautious about presenting it as a guaranteed physical-performance boost.
L-CITRULLINE AND GLUTATHIONE
Pre Lab Pro contains 2,200 mg of a combined L-citrulline and glutathione blend. The total amount is shown, but the individual amount of each ingredient isn’t.
That matters because you can’t judge the citrulline properly without knowing how much is there. Even if most of the blend were citrulline, it would still be difficult to compare with studies using substantially larger amounts of citrulline malate.
The latest systematic review and meta-analysis of citrulline malate found a possible small improvement in exercise performance, but the evidence was uncertain and depended heavily on the type of exercise and how the supplement was used.
I wouldn’t call the blend useless. I simply don’t think the label gives us enough information to make strong claims about pumps, strength or muscular endurance.
RED BEET POWDER
Beetroot can support exercise performance because it contains nitrate, which the body converts into nitric oxide. That can affect blood flow and the efficiency with which muscles use oxygen.
The problem isn’t the idea. It’s the information missing from the label.
Pre Lab Pro contains 1,500 mg of beetroot powder, but the amount of nitrate isn’t stated. Research generally measures nitrate rather than the total weight of beetroot powder. A large review of nitrate supplementation found mixed results, with more noticeable benefits when sufficient nitrate was consumed consistently.
Timing also matters. Many nitrate studies give it considerably earlier than the 15 to 30 minutes recommended for Pre Lab Pro. The beetroot may contribute something, but the label doesn’t allow me to say how much.
VITAMINS, IRON AND ELECTROLYTES
The formula includes vitamin D3, several B vitamins, iron, potassium and sodium. They all have legitimate roles in health and normal physical function, but that doesn’t mean taking them immediately before a workout will suddenly improve your performance.
The 200 mg of sodium may be useful if you train in the heat or sweat heavily. The potassium amount is small, and neither replaces a proper hydration strategy during long or particularly sweaty sessions.
I wouldn’t buy Pre Lab Pro for its vitamins and minerals. Consider them supporting ingredients rather than the main event.
DOES PRE LAB PRO WORK?
For energy and focus, it worked well for me.
The moderate caffeine was enough to feel useful, while the overall effect felt steadier than simply throwing more coffee at the problem. That’s the part I could notice and the part of the formula with the clearest rationale.
I’m less convinced by the wider claims about strength, power, pumps and recovery. I couldn’t find a published independent trial testing the complete Pre Lab Pro formula, so those claims rely on research into the individual ingredients. Some of those ingredients are promising, but the amounts and timing don’t always match the conditions used in successful studies.
That doesn’t make it a bad product. It makes it a more focused one. I see Pre Lab Pro primarily as a lower-caffeine energy and concentration supplement, with possible additional benefits rather than guaranteed ones.
PRE LAB PRO OR COFFEE?
Coffee wins comfortably on price. It also has plenty of evidence behind it and, in my entirely unbiased opinion, tastes better.
Pre Lab Pro gives you a consistent 80 mg of caffeine alongside L-theanine and L-tyrosine. With coffee, the caffeine can vary depending on the beans, size and brewing method. Pre Lab Pro removes that guesswork and gives you a different type of drink when another coffee feels like too much.
If all you want is caffeine, buy coffee. If you want a more controlled amount combined with ingredients aimed at attention and focus, Pre Lab Pro has a clearer reason to exist.
IS PRE LAB PRO GOOD FOR FASTED TRAINING?
It can be useful when you train before breakfast because it gives you caffeine and something flavoured to drink without requiring a full meal.
That doesn’t make it a replacement for food. If eating carbohydrate before a long or demanding session improves your performance, Pre Lab Pro can’t do the same job. My guide to fasted versus fed weight training explains when training without food can work and when eating first may be the better choice.
I’d also avoid confidently calling Pre Lab Pro zero-calorie. The product is labelled as having no added sugar, but its other ingredients include dextrose and several sweeteners, and the page doesn’t provide a calorie figure.
If by fasted you simply mean training before breakfast, it can fit comfortably. If you’re following a strict zero-calorie fast, the available information isn’t clear enough to guarantee that it meets your rules.
HOW TO TAKE PRE LAB PRO
Performance Lab recommends mixing one 13 g scoop with 300 ml of water and drinking it 15 to 30 minutes before training. The label says not to exceed two scoops within 24 hours.
I’d start with one scoop. If you also drink coffee, tea or energy drinks, remember that all the caffeine counts towards the same daily total.
Caffeine can affect sleep even when you don’t feel especially stimulated, so I’d be cautious about taking it before an evening session. A better workout isn’t much of a bargain if you’re still staring at the ceiling at two in the morning.
THE PROS
The 80 mg caffeine content is moderate and clearly stated
L-theanine and caffeine are combined in a sensible two-to-one ratio
It provided steady energy and better focus when I tested it
The berry flavour tastes good
It’s vegan and free from several common allergens
There’s no beta-alanine tingling
Performance Lab states that it’s third-party tested and validated by Informed Sport
The lower-stimulant approach may suit people who dislike aggressive pre-workouts
THE CONS
Twenty servings for $59 makes it a little on the pricey side
The L-citrulline and glutathione amounts aren’t disclosed separately
The beetroot powder doesn’t state its nitrate content
Several physical-performance claims are stronger than the available formula evidence
The vitamins and minerals are unlikely to create an immediate performance difference if your nutritional status is already adequate
It isn’t the obvious choice for somebody who wants a heavily dosed pump formula
No stimulant product can guarantee that every user will avoid jitters, crashes or disrupted sleep
WHO IS PRE LAB PRO FOR?
Pre Lab Pro makes the most sense if you want a noticeable but controlled lift before training. It may particularly suit early-morning exercisers, people who dislike high-stimulant formulas and anyone who wants more focus without taking several hundred milligrams of caffeine.
It’s less appealing if your main goal is the strongest possible pump, you already drink enough coffee or you want the best performance return for the lowest price. Good food, adequate sleep, creatine and a decent training program should still come before any pre-workout.
FREQUENTLY ASKED QUESTIONS
HOW MUCH CAFFEINE DOES PRE LAB PRO CONTAIN?
One scoop contains 80 mg of caffeine from Coffea robusta seeds. Two scoops would provide 160 mg, before counting any coffee, tea or other caffeinated products you consume.
WILL PRE LAB PRO CAUSE JITTERS?
The caffeine amount is lower than many pre-workouts, and the formula includes twice as much L-theanine as caffeine. That may produce a smoother experience, but individual responses to caffeine vary. No supplement can promise that every user will avoid jitters or sleep disruption.
CAN YOU TAKE PRE LAB PRO WITH COFFEE?
You can, and that’s how I tested it. I reduced my normal two pre-workout coffees to one and added a scoop of Pre Lab Pro. Just keep an eye on the combined caffeine amount rather than treating them as separate things.
CAN PRE LAB PRO REPLACE A PRE-WORKOUT MEAL?
No. It may provide caffeine, focus and some electrolytes, but it doesn’t replace the carbohydrate, protein or total energy you’d get from food.
IS PRE LAB PRO WORTH THE PRICE?
It depends on what you want from it. If you value moderate caffeine, convenience and a focus-led formula, I think it’s worth considering. If you only want an energy boost, coffee will do the basic job for considerably less money.
MY VERDICT
I liked Pre Lab Pro when I tested it. The energy felt steady, my focus held up well and it didn’t try to turn an ordinary training session into a nightclub.
The caffeine and L-theanine combination is the main reason I’d recommend it. The rest of the formula adds interest, but I wouldn’t pretend the evidence supports every promise made for it.
For somebody who wants a cleaner-feeling, lower-caffeine pre-workout and doesn’t mind paying a premium, it’s a good option. If you want an enormous stimulant hit or a heavily dosed pump formula, this probably isn’t the one.
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WHAT ABOUT MIND LAB PRO?
Pre Lab Pro is designed around training. If your main priority is concentration during work, studying or mentally demanding days, my Mind Lab Pro review is the more relevant place to start.
They’re related products, but they solve different problems. Pre Lab Pro combines moderate caffeine with ingredients aimed at energy, focus and exercise performance. Mind Lab Pro is a caffeine-free nootropic designed for broader cognitive support.
If you’re still deciding what’s worth your money, you’ll find all my supplement reviews and guides in one place.
