MST Amino Pump Review: L-Citrulline + L-Arginine Pump Pre-Workout in Capsule Form
The pre-workout market is dominated by stimulant-heavy powders full of caffeine and beta-alanine tingles. But a growing segment of athletes — those training at night, sensitive to stimulants, or who simply want cardiovascular support without the energy spike — is turning to stimulant-free "pump" products. MST Nutrition's Amino Pump capsules fill exactly this niche.
At MaxFit.ee, MST Amino Pump L-Citrulline + L-Arginine retails for €16.90 for 60 capsules — that is €0.28 per serving, one of the most accessible pump supplements available in Estonia. But does the ingredient formula actually deliver?
Who This Is For
MST Amino Pump is ideal for:
- Athletes who want a pre-workout pump without stimulants (no caffeine, no jitters)
- Evening trainers who cannot use caffeinated pre-workouts without disrupting sleep
- Those already stacking with a caffeinated product who want to add vasodilator support
- Anyone focused on cardiovascular endurance alongside strength training
- Athletes looking for capsule-format convenience (no mixing, no taste issues)
TL;DR
- Key ingredients: L-Citrulline + L-Arginine
- Form: capsules (convenient, no taste, easy to dose)
- Price: €16.90 / 60 capsules = €0.28 per serving
- Stimulant-free: yes — no caffeine
- Best for: pump, vasodilation, endurance, evening training sessions
- Con: capsule form limits total dose vs. bulk powder options; exact per-capsule dose not disclosed on some labels
Product Overview
MST Nutrition is a Ukrainian-origin sports nutrition brand with growing European distribution. Their approach leans toward targeted, ingredient-specific products rather than heavy proprietary blends. The Amino Pump is a clear example: two clinically studied ingredients — L-citrulline and L-arginine — in a simple, no-frills capsule format.
At €0.28 per serving, this is among the cheapest pump-specific pre-workout options at MaxFit.ee. The 60-capsule format provides 60 single-serving doses, or 30 sessions if doubled.
Ingredient Analysis
L-Citrulline
L-citrulline is an amino acid that does not directly raise nitric oxide (NO) — instead, it is converted in the kidneys to L-arginine, which then produces NO via the enzyme nitric oxide synthase (Curis et al., 2007). Counterintuitively, oral L-citrulline raises plasma arginine levels more effectively than oral arginine supplementation itself, because arginine is extensively broken down in the gut and liver (Moinard et al., 2008).
Nitric oxide causes vasodilation — blood vessels relax and widen, increasing blood flow to working muscles. This delivers:
- Enhanced "pump" sensation during resistance training
- Increased oxygen and nutrient delivery
- Potential reduction in muscle soreness (Pérez-Guisado & Jakeman, 2010)
The effective clinical dose for L-citrulline in most studies is 6–8 g as citrulline malate (roughly 3–4 g pure citrulline) per session. Users should check the exact per-serving dose on the MST Amino Pump label, as capsule products sometimes require taking multiple capsules to reach the clinical threshold.
L-Arginine
L-arginine is the direct NO precursor, but as noted above, oral arginine bioavailability is limited due to first-pass metabolism. It works synergistically with citrulline in this formula — citrulline replenishes the arginine pool in tissues where it is needed most, while oral arginine provides a direct substrate boost (Lucotti et al., 2006).
Together, the citrulline-arginine combination offers complementary pathways for elevating NO production, which is the rationale behind this pairing.
Effectiveness & Effect Analysis
Pump effect: L-citrulline at effective doses consistently produces a noticeable muscle pump during resistance training, supported by increased muscle fullness and vascularity (Bailey et al., 2015). The pump is real, though its subjective intensity depends on your base nitric oxide levels, hydration, and training style.
Endurance: Citrulline has demonstrated improvements in time-to-fatigue and reduced perceived exertion in both resistance and aerobic exercise contexts (Pérez-Guisado & Jakeman, 2010).
Recovery: Post-exercise muscle soreness (DOMS) is reduced in several citrulline studies, possibly due to improved metabolite clearance (Pérez-Guisado & Jakeman, 2010).
What to expect realistically: At the dose provided in the MST capsule format, the pump effect will be present but may be more subtle than using standalone high-dose citrulline powder (e.g., MST Citrulline RAW at 300 g, €22.90, for those who want maximum dosing flexibility).
Price & Value
| Product | Type | Price | Servings | Per serving |
|---|---|---|---|---|
| MST Amino Pump | Capsules (Citrulline + Arginine) | €16.90 | 60 | €0.28 |
| MST Citrulline RAW 300g | Powder (pure citrulline) | €22.90 | 30 | €0.76 |
| MST L-Citrulline 240caps | Capsules (pure citrulline) | €23.90 | 240 | €0.10 |
For pure cost-per-serving, the MST L-Citrulline 240-capsule option is cheaper at €0.10/serving — but that product gives only one ingredient. The Amino Pump's combination of two vasodilator amino acids at €0.28/serving is good value for a targeted pump stack.
Comparison vs. Competitors
vs. High-stimulant pre-workouts: Amino Pump is not a replacement for caffeinated pre-workouts if you need the energy boost. It is a complement or an alternative for stimulant-free sessions.
vs. MST Citrulline RAW (powder): The powder gives more dosing flexibility and more citrulline per serving but requires mixing. Capsules win on convenience and travel-friendliness.
vs. other pump capsules on the market: At €0.28/serving with two active amino acids, MST Amino Pump is competitively priced. Many branded pump capsules cost €0.50–1.00+ per serving for similar ingredients.
Common Mistakes
1. Under-dosing: Capsule products sometimes require 3–4 capsules per session to reach clinically effective citrulline doses. Read the label carefully.
2. Not hydrating enough: Vasodilators work better when you are well-hydrated. Aim for 500 ml water in the 60–90 minutes before training.
3. Expecting stimulant effects: This is a stimulant-free product. If you want energy elevation, pair it with a caffeinated pre-workout or coffee.
4. Taking it too late: Take 30–45 minutes before training for optimal citrulline conversion to arginine and NO elevation.
Verdict
MST Amino Pump is a straightforward, science-backed pump supplement at one of the lowest price points in Estonia. The L-citrulline + L-arginine combination is supported by solid research, and the capsule format is a genuine convenience advantage for athletes who dislike mixing powders or train at locations without access to a shaker.
The main question mark is the exact per-capsule dosing — users should verify they are reaching an effective citrulline dose per session. If the label dose falls short, stacking with MST Citrulline RAW powder is a practical solution.
Rating: 3.5/5 — Solid science, excellent price, but dose verification is essential.
FAQ
Does MST Amino Pump contain caffeine?
No. Amino Pump is a stimulant-free pump product containing only L-citrulline and L-arginine. It is safe to use for evening training without affecting sleep.
How long before training should I take it?
Take 30–45 minutes before training. L-citrulline peak plasma concentration occurs around 60–90 minutes after oral dosing, so allowing adequate time is important.
Can I stack MST Amino Pump with a caffeinated pre-workout?
Yes. This is a common and effective stacking strategy — use the caffeinated product for energy and focus, and the amino pump for vasodilation and endurance support.
Is this product suitable for women?
Absolutely. Vasodilatory compounds like citrulline and arginine support training performance regardless of sex, and the stimulant-free formula is gentle for all users.
How many capsules should I take per session?
Check the product label. Most citrulline-arginine capsule products require 3–5 capsules per session to reach clinically effective doses. Follow the manufacturer's recommended serving.
References
- Curis, E., Nicolis, I., Moinard, C., et al. (2007). Almost all about citrulline in mammals. Amino Acids, 29(3), 177–205.
- Moinard, C., Nicolis, I., Neveux, N., et al. (2008). Dose-ranging effects of citrulline administration on plasma amino acids and hormonal patterns. British Journal of Nutrition, 99(4), 855–862.
- Pérez-Guisado, J., & Jakeman, P. M. (2010). Citrulline malate enhances athletic anaerobic performance and relieves muscle soreness. Journal of Strength and Conditioning Research, 24(5), 1215–1222.
- Bailey, S. J., Blackwell, J. R., Lord, T., et al. (2015). L-citrulline supplementation improves O2 uptake kinetics and high-intensity exercise performance in humans. Journal of Applied Physiology, 119(4), 385–395.
- Lucotti, P., Setola, E., Monti, L. D., et al. (2006). Beneficial effects of a long-term oral L-arginine treatment added to a hypocaloric diet and exercise training program in obese, insulin-resistant type 2 diabetic patients. American Journal of Physiology, 291(5), E906–E912.
Get MST Amino Pump at MaxFit.ee
Available now at MaxFit.ee with delivery across Estonia. Pair it with your existing pre-workout stack or use it alone for a stimulant-free training session.
