£27.95
Per4M Pump is a stim-free pre-workout formulated to deliver powerful muscle pumps, sharper focus and consistent performance without caffeine.
It combines a classic pump blend with Glycersize™, a premium glycerol formula included separately to boost hydration, vascularity and muscle fullness without the clumping issues common in traditional glycerol-based mixes.
Perfect for serious gym-goers training at any time of day, including evenings.
Nutrition Breakdown (per 16.5g scoop):
L-Citrulline – 10g
Taurine – 3g
No caffeine (stim-free)
Includes Glycersize™ (use 1 scoop alongside)
Ingredients:
L-Citrulline
Taurine
Malic Acid
VitaCholine™ (Choline Bitartrate)
Pink Himalayan Salt
Flavouring
Anti-caking agent (Silicon Dioxide)
Sweetener (Sucralose)
Astragin®
Natural Colours (e.g., Beetroot, Spirulina)
Is it suitable for vegans/vegetarians?
Per4M Pump does not list animal-derived ingredients and can be considered suitable for vegetarians and vegans, but the Per4M website doesn’t explicitly certify this. Always verify dietary suitability with the manufacturer if urgently required.
Allergen Information:
No common allergens are added to the formula, but it’s produced in a facility that processes nuts, milk, eggs, soy and fish.
Directions:
Mix 1 scoop (16.5g) in 200-300 ml of water and consume 15-30 minutes before exercise.
To maximise pump and hydration, add 1 scoop of Glycersize™ alongside your PUMP serving.
Per4M Pump is one of the cleaner stim-free pump pre-workouts out there – and its standout feature is the Glycersize™ inclusion, which is basically glycerol delivered in a way that avoids the usual clumping problem and helps hydration and fullness without caffeine.
Who it’s for:
PM lifters who wants serious physical pumps, hydration and vascularity in their workouts without the jitters from caffeine.
Ideal for evening sessions when stimulants aren’t recommended. People stacking a stim pre-workout and want a non-stim pump base with hydration boosters included.
What it does:
Delivers 10g L-Citrulline – a precursor to nitric oxide which supports blood flow and muscle engorgement.
3g Taurine, which is commonly included to support cellular hydration and endurance during intense training.
Glycersize™ promotes full-body hydration and vascularity by increasing water volume within muscle cells (when used as directed).
A ‘neuro blend’ helps mind-muscle engagement and focus independent of costimulants.
How I’d use it:
Mix 1 scoop with water 15-30 min before training.
Always include the Glycersize™ scoop alongside – that’s where the hydration and fullness benefits come in.
Great on its own if you train late, or stacked with a stim pre-workout earlier in the day.
Use consistently for pump effects, but back it with strong nutrition, sleep, and hydration basics – pumps always feel best when you’re well-fuelled and hydrated.
The Science:
Study: Review showing L-citrulline increases arginine availability and nitric oxide synthesis, supporting enhanced blood flow to muscles – key for pump effects.
Nutrients, 2021 (meta-analysis review)
https://www.mdpi.com/2072-
Citrulline supplementation has been linked to improved blood flow and enhanced exercise performance, which supports the theoretical action of high-dose L-citrulline in pump formulas like this.
Study: Narrative review summarising evidence that taurine supplementation can influence exercise performance, reduce oxidative stress, and support endurance capacity.
ResearchGate review, 2025
Though results vary by dose and activity type, taurine has the potential to support endurance, recovery and overall performance – fitting its inclusion in Per4M Pump.
