Pre-workout products promise focus, pumps, and energy. Some ingredients are well supported; others are marketing noise. Here is a practical UK-focused guide so you can read a label without the hype.
Ingredients that usually matter
Caffeine
Typically 150-300 mg per serving for trained users. It can improve alertness and endurance performance. If you already drink coffee, count total daily caffeine to avoid jitters or poor sleep.
Beta-alanine
Common dose 3.2-6.4 g per day (tingling is normal). It may help buffer fatigue in efforts lasting roughly 1-4 minutes.
Citrulline (or citrulline malate)
Often dosed around 6-8 g. Some users report better training volume; evidence is mixed but generally safe for healthy adults.
Creatine
Not time-sensitive-daily use is fine. See our creatine guide for dosing detail.
What to be careful with
- Proprietary blends that hide individual doses-you cannot tell if you are getting effective amounts
- Extreme stimulant stacks if you have anxiety, heart conditions, or use other stimulants
- "Dry scooping" - unnecessary risk; mix with water
Non-stimulant pre-workout options
Train late in the day? Look for stim-free formulas focused on citrulline, beta-alanine, and electrolytes-or use a smaller caffeine dose earlier with food.
Shop pre-workout at GymStack
Explore pre-workout formulas, caffeine, and beta-alanine to build a stack that matches your tolerance and schedule.
Do not exceed label directions. Not suitable for under-18s or during pregnancy without professional guidance.