GSN Vaso Pump Pre-Workout
💉 8000mg of L-citrulline DL malate (2:1) per serving — ~5300mg pure citrulline
🚫 0mg caffeine — stimulant-free — train at 8pm without disrupting sleep
🔥 4000mg beta-alanine + 2500mg betaine anhydrous — endurance and power
🧠 1000mg L-tyrosine + 150mg ginkgo biloba — clean focus without stimulation
🇧🇪 Belgian brand — NSF & cGMP certified — 25 servings per 500g jar
What is GSN Vaso Pump Pre-Workout?
GSN Vaso Pump Pre-Workout is a stimulant-free pre-workout formula developed by GSN Labs — a Belgian sports nutrition brand based in Vilvorde. Each 20g serving delivers nine individually declared active ingredients, built around an 8000mg citrulline DL malate core, 4000mg of beta-alanine and 2500mg of betaine anhydrous — three of the most evidence-grounded pre-workout performance ingredients — with no caffeine, no stimulants and no proprietary blend.
The defining characteristic of Vaso Pump is its complete freedom from caffeine and stimulants. GSN Labs' argument is precise: the pump and vasodilation effect comes from nitric oxide production, not from stimulants. The 8000mg of L-citrulline DL malate (2:1 ratio) — equivalent to approximately 5300mg of pure citrulline — drives nitric oxide production through the kidney-to-arginine conversion pathway, producing the vasodilation, increased blood flow and intramuscular pump that defines the best training sessions. Caffeine does not contribute to this mechanism. Removing it means the pre-workout can be taken at any time of day, stacked with any caffeinated product without risk, and used without the energy crash that follows when a stimulant dose wears off mid-session.
The formula adds four further functional dimensions beyond the pump stack: beta-alanine (4000mg) for intramuscular acid buffering and endurance; betaine anhydrous (2500mg) for cellular hydration and power output; taurine (1300mg) for muscle cell osmotic balance; L-tyrosine (1000mg) as a catecholamine precursor for concentration and motivation without stimulation; and ginkgo biloba extract (150mg, with 36mg flavonoglycosides and 9mg terpenolactones) for cerebrovascular blood flow and cognitive focus.
The product also contains spirulina extract (140mg) for micronutrient contribution and vitamin B6 (4.9mg) for normal energy metabolism.
Available in a 500g jar providing 25 servings, in Blue Ice flavour.
⚠️ Beta-alanine causes a harmless tingling sensation (paresthesia) in the skin approximately 15 to 30 minutes after consumption. This is a normal physiological reaction to beta-alanine at doses above 2g and is completely safe.
8g of citrulline. Zero caffeine. Maximum pump. Any time of day.
| Brand | GSN Labs |
| Flavour | Blue Ice |
| Size | 500 gr |
How GSN Vaso Pump Pre-Workout supports your objectives
💉 8000mg L-citrulline DL malate (2:1) — the highest-dose pump ingredient available
L-citrulline DL malate at 8000mg in a 2:1 ratio delivers approximately 5300mg of pure citrulline alongside approximately 2700mg of malic acid. Citrulline is converted to arginine in the kidneys, where it serves as the substrate for nitric oxide synthase (NOS) — the enzyme that produces nitric oxide (NO). Elevated NO levels relax and dilate blood vessel walls, increasing blood flow, oxygen delivery and nutrient supply to working muscles. This produces the characteristic muscle pump and visible vascularity experienced during training, and genuinely supports performance through improved tissue perfusion. The malate fraction contributes to Krebs cycle support and ammonia clearance, compounding the endurance benefit. At 8000mg, Vaso Pump exceeds the dose used in the most frequently cited citrulline malate research studies (6 to 8g), providing a full clinical dose in every serving.
🔋 4000mg beta-alanine — intramuscular acid buffer for extended endurance
Beta-alanine combines with histidine in muscle tissue to form carnosine — the primary intracellular buffer that neutralises the hydrogen ions produced during high-intensity exercise. Without adequate carnosine, acid accumulation causes the characteristic burning sensation that limits the number of repetitions in a set or the duration of a high-intensity interval. Beta-alanine supplementation chronically elevates muscle carnosine content, directly expanding this buffering capacity and delaying the acid-driven onset of fatigue. At 4000mg per serving — at the upper range of the dose studied in published research (2 to 6g) — Vaso Pump provides the full beta-alanine stimulus. The characteristic skin tingling (paresthesia) that occurs 15 to 30 minutes after consumption is a normal, harmless physiological response.
💪 2500mg betaine anhydrous — osmotic cellular hydration and power output
Betaine (trimethylglycine) acts as an osmolyte — a compound that draws water into muscle cells, increasing cell volume and supporting the hydration status of muscle tissue during exercise. Research has associated betaine supplementation with meaningful improvements in both strength output (measured as repetitions to failure) and power production. At 2500mg per serving, Vaso Pump provides the dose range studied in the most consistent research on betaine's exercise performance effects.
🧠 1000mg L-tyrosine + 150mg ginkgo biloba — focus without stimulation
L-tyrosine is the dietary precursor to dopamine, norepinephrine and epinephrine — the catecholamines responsible for motivation, alertness and cognitive performance under stress. Unlike caffeine (which forces catecholamine release regardless of training status), L-tyrosine simply provides the substrate from which the brain produces these neurotransmitters on demand. The 150mg of ginkgo biloba extract (standardised to 36mg flavonoglycosides and 9mg terpenolactones) supports cerebrovascular blood flow and cognitive function, complementing L-tyrosine's substrate supply for a clean, sustained mental sharpness throughout the session.
💧 1300mg taurine — muscle cell osmotic balance and performance
Taurine is one of the most abundant amino acids in cardiac and skeletal muscle, where it regulates the osmotic balance of muscle cells and modulates calcium-dependent muscle contraction. Its inclusion at 1300mg per serving works synergistically with betaine's osmolyte effect to maintain optimal intracellular hydration during training, supporting both contractile force and recovery between sets.
🎯 Goal guide
🏋️ Mass gain: 1 serving 20 minutes pre-workout. Maximises pump and nutrient delivery to muscle tissue during training under a caloric surplus.
🔥 Weight loss / cutting: 1 serving pre-workout. Zero calories, zero sugar — maximum training quality during caloric restriction.
⚖️ Body recomposition: 1 serving pre-workout. Sustained endurance and pump support for high-frequency training.
Serving suggestion
Mix 1 scoop (20g) in 300 to 400ml of cold water. Shake well for 15 seconds. Consume 20 minutes before training. Do not exceed 1 serving per day. Not recommended for individuals with cardiovascular conditions, pregnant or breastfeeding women. Store at room temperature in a cool, dry place away from sunlight.
⚠️ Beta-alanine paresthesia: a harmless tingling or itching sensation in the skin (face, neck, hands) approximately 15 to 30 minutes after consumption is expected at this dose. It is a normal physiological response to beta-alanine and is completely safe — not an allergic reaction. The sensation diminishes with regular use as muscle carnosine levels accumulate.
Best times to enjoy it
🏋️ 20 minutes before training (recommended)
The optimal pre-workout window: citrulline plasma levels peak 30 to 90 minutes after consumption, so the 20-minute pre-workout timing ensures peak vasodilation aligns with the first working sets. Beta-alanine begins its tingling sensation within 15 to 30 minutes — a useful physiological cue that the formula is active.
🌙 Evening training sessions — the primary advantage
Vaso Pump's 0mg caffeine content is its most relevant feature for athletes who train after 6pm. A full-dose stimulant pre-workout taken at 7pm often maintains plasma caffeine levels until midnight, disrupting sleep onset and quality. Vaso Pump provides the full pump, endurance and focus effect of a premium pre-workout with absolutely no impact on sleep architecture or timing.
☕ Stackable with any caffeinated drink
For athletes who want the caffeine-based energy of a standard stimulant pre-workout alongside the pump and endurance stack of Vaso Pump, both can be taken together without concern. A NOCCO BCAA can, a coffee or any GSN pre-workout can be combined with Vaso Pump to add a caffeine layer without approaching unsafe daily caffeine thresholds.
Pre-workout timing guide
| Ingredient | Effect onset | Peak effect |
|---|---|---|
| L-citrulline DL malate | 30 to 60 min | 60 to 90 min |
| Beta-alanine | 15 to 30 min (tingling) | Chronic (muscle carnosine builds over weeks) |
| Betaine anhydrous | 45 to 60 min | 60 to 90 min |
| L-tyrosine | 30 to 60 min | 60 to 90 min |
| Ginkgo biloba | 45 to 60 min | 60 to 90 min |
Full ingredient list
L-citrulline DL malate 2:1 (8000mg), beta-alanine (4000mg), betaine anhydrous (2500mg), maltodextrin (1405mg), taurine (1300mg), L-tyrosine (1000mg), ginkgo biloba extract (150mg — of which flavonoglycosides 36mg, terpenolactones 9mg), spirulina extract (140mg), vitamin B6 (4.9mg). Flavourings, colourant (natural), sweetener (sucralose).
Nine active ingredients. Every gram declared. No proprietary blend.
Complete ingredient breakdown per 20g serving
| Ingredient | Per 20g serving | Role |
|---|---|---|
| L-citrulline DL malate 2:1 | 8000mg (~5300mg citrulline pure) | Primary pump ingredient; NO precursor; vasodilation, blood flow, ammonia clearance |
| Beta-alanine | 4000mg | Carnosine precursor; intramuscular acid buffer; endurance |
| Betaine anhydrous | 2500mg | Osmolyte; cellular hydration; strength and power |
| Maltodextrin | 1405mg | Glucidic texture support; neutral carbohydrate carrier |
| Taurine | 1300mg | Muscle cell osmotic balance; calcium-dependent contraction |
| L-tyrosine | 1000mg | Catecholamine precursor; focus and motivation without stimulation |
| Ginkgo biloba extract | 150mg (36mg flavonoglycosides, 9mg terpenolactones) | Cerebrovascular blood flow; cognitive function and focus |
| Spirulina extract | 140mg | Micronutrient contribution |
| Vitamin B6 | 4.9mg | Normal energy-yielding metabolism (EU health claim) |
| Total calories | 28.6 kcal | — |
| Caffeine | 0mg | — |
| Total fibre | 5.1g | — |
Allergens
Allergens: No major allergens declared. No added sugar, gluten-free, GMO-free. Always refer to the current product label for the most up-to-date allergen information.
Product characteristics:
- 0mg caffeine — stimulant-free
- 0g sugar
- 28.6 kcal per serving
- 5.1g dietary fibre per serving
- Gluten-free
- GMO-free
- NSF certified
- cGMP certified production
- Suitable for evening use — no sleep disruption
Nutritional values per serving (20g)
| Nutritional values | Per 20g serving |
|---|---|
| Energy | 28.6 kcal |
| Fat | 0g |
| Carbohydrates | trace |
| of which sugars | 0g |
| Dietary fibre | 5.1g |
| Protein | 0g |
| Salt | 0g |
| Caffeine | 0mg |
Active ingredient profile per serving (20g) — fully declared
| Active ingredient | Per serving |
|---|---|
| L-citrulline DL malate 2:1 | 8000mg |
| — of which L-citrulline (pure equivalent) | ~5300mg |
| — of which malic acid | ~2700mg |
| Beta-alanine | 4000mg |
| Betaine anhydrous | 2500mg |
| Taurine | 1300mg |
| L-tyrosine | 1000mg |
| Ginkgo biloba extract | 150mg (flavonoglycosides 36mg, terpenolactones 9mg) |
| Spirulina extract | 140mg |
| Vitamin B6 | 4.9mg |
Jar duration guide
| Format | Net weight | Servings (at 20g/day) |
|---|---|---|
| Standard | 500g | 25 servings |
Q1 — Why is Vaso Pump stimulant-free when most pre-workouts use 150 to 400mg of caffeine?
GSN Labs' position is that the pump and vasodilation that define a great training session come from nitric oxide production — not from stimulants. The 8000mg of citrulline DL malate drives nitric oxide synthesis through the citrulline-to-arginine-to-NO pathway, which is entirely independent of caffeine. A stimulant pre-workout produces energy through central nervous system activation, not through improved muscle blood flow. By building Vaso Pump without stimulants, GSN created a pre-workout that can be used at any training time, combined freely with any caffeinated beverage of choice, and used continuously without caffeine tolerance degrading its effectiveness. For athletes who train in the evening or who are caffeine-sensitive, it is the only option that provides a complete performance stack without the sleep cost.
Q2 — What is the tingling sensation from beta-alanine and is it safe?
The tingling sensation — called paresthesia — is caused by beta-alanine binding to cutaneous sensory receptors under the skin, temporarily altering their signalling threshold. It typically begins 15 to 30 minutes after consuming 2g or more of beta-alanine and affects the face, neck, hands and scalp most commonly. It is a completely harmless physiological response with no adverse effects on training or health. The sensation diminishes with regular use as the body adapts, typically over 2 to 4 weeks of consistent supplementation. Many athletes experience it as a useful signal that the pre-workout is active. Splitting the dose or consuming with food can reduce its intensity if preferred.
Q3 — Why does the label say 8000mg of citrulline DL malate but then specify ~5300mg of pure citrulline?
L-citrulline DL malate 2:1 is a molecular compound of citrulline and malic acid in a 2:1 weight ratio. In 8000mg of the compound, approximately 5300mg is pure citrulline and approximately 2700mg is malic acid. Most pre-workout labels declare the compound weight (8000mg) without specifying the pure citrulline equivalent — making it impossible to compare doses meaningfully. GSN Labs is transparent about this distinction on its product page, explicitly noting that the 8000mg corresponds to approximately 5300mg of pure citrulline. This precision is the reason the transparent dosing claim on their labels is meaningful rather than cosmetic.
Q4 — Can I use Vaso Pump alongside GSN Ultrapure Creatine and GSN BCAA + EAA + Electrolytes?
Yes — all three are complementary and the combination forms the brand's signature training stack. Vaso Pump provides the pre-workout pump and endurance stimulus (citrulline, beta-alanine, betaine). BCAA + EAA + Electrolytes provides intra-workout anti-catabolic amino acid and hydration support. Ultrapure Creatine provides the long-term phosphocreatine saturation for explosive strength and lean mass. The three products address three distinct physiological dimensions (vasodilation/endurance, amino acid availability/hydration, and phosphocreatine/power) with no ingredient overlap or interaction.
Q5 — How long does one 500g jar last?
At 20g per serving and one serving per day (pre-workout), the 500g jar provides exactly 25 servings. For athletes who train 5 to 6 days per week, one jar provides approximately 4 to 5 weeks of supply. For athletes training 4 times per week, one jar provides approximately 6 weeks.