ATP Lab E-NOS Powder 330g – Bulldog Nutrition Canada
ATP Lab

ATP Lab E-NOS Powder 330g

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Most pre-workouts combine caffeine with pump ingredients — but stimulants raise cortisol, disrupt sleep, and create tolerance over time. ATP Lab E-NOS is a fully stimulant-free pump pre-workout that drives nitric oxide production through three distinct pathways: L-citrulline (arginine recycling), Nitrosigine® (patented arginine silicate inositol), and AgMass™ agmatine sulfate. GlycerPump™ (glycerol) adds hyperhydration-driven pumps, while beta-alanine supports anaerobic buffering — all in a 20-serving citrus powder that can be used any time of day without affecting sleep.

Ingredient Amount / Role
Brand ATP Lab
Format Powder
Serving Size 1 scoop (~16.5g) in 1–2 cups water, 20 min pre-workout
Servings Per Container 20 (330g)
L-Citrulline 5,000 mg — arginine recycling, sustained NO production
Nitrosigine® (Arginine Silicate Inositol) 1,500 mg — clinically enhances arginine and NO in blood
AgMass™ Agmatine Sulfate 1,000 mg — activates endothelial NO system
GlycerPump™ (Glycerol) 1,000 mg — hyperhydration and muscle fullness/pumps
Beta-Alanine 1,500 mg — carnosine buffering, reduces lactate buildup
Flavor Citrus
Certifications GMP, Pharmaceutical Grade, Made in Canada

Key Benefits

  • Zero stimulants — no caffeine, no jitteriness, no crash, no sleep disruption
  • Triple NO pathway: L-citrulline + Nitrosigine® + AgMass™ agmatine for maximum nitric oxide output
  • 5g L-citrulline — clinically effective dose for vasodilation and blood flow
  • Nitrosigine® is a patented, clinically studied form shown to raise arginine and NO levels for up to 3 hours
  • GlycerPump™ drives intramuscular water retention for visible muscle fullness and enhanced pumps
  • Beta-alanine buffers pH drop during high-intensity work, extending anaerobic capacity
  • Stack with a stimulant-based pre-workout for maximum pump + energy, or use solo for evening training

Best For

  • Athletes who train in the evening or are sensitive to stimulants
  • Anyone wanting to maximize pump and blood flow without adding more caffeine to their stack
  • Those stacking with a stimulant pre-workout to add pump volume without doubling up on stimulants

Not Ideal For

  • Those looking for a pre-workout energy boost — E-NOS is pump-focused with no stimulant effect
  • People who dislike the beta-alanine tingling (paresthesia) — reduce serving size if this is uncomfortable

Ingredients
Medicinal (per scoop): L-Citrulline 5,000 mg, Nitrosigine® (Arginine Silicate Inositol) 1,500 mg, AgMass™ Agmatine Sulfate 1,000 mg, GlycerPump™ Glycerol 1,000 mg, Beta-Alanine 1,500 mg.
Non-medicinal: Natural citrus flavour, Stevia, Citric Acid.
Allergen note: Gluten-free. Free from artificial sweeteners and stimulants. Made in Canada.

Who Is This For?

ATP Lab pump formula is ideal for athletes who want enhanced blood flow, muscle fullness, and endurance without stimulants. It suits those who train late at night, are sensitive to caffeine, or who want to stack a pump supplement with their existing pre-workout for amplified results.

Who Is This NOT For?

Not a standalone energy supplement — it provides no stimulant energy. Not necessary for casual exercisers who do not prioritize pump or vascularity. Those on nitrate-containing medications or with hypotension should consult a doctor before use.

Why Buy From Bulldog Nutrition?

Bulldog Nutrition is an authorized Canadian and US retailer of ATP Lab products. We source directly from the brand — never from grey market or unauthorized distributors — so every order is genuine and fresh.

  • ✓ Authorized ATP Lab retailer — authentic products only, never grey market or counterfeit
  • ✓ Ships across Canada and the US — fast, reliable delivery to your door
  • ✓ 10+ years in business — a track record you can rely on
  • ✓ 4.7/5 stars from 2,400+ verified customer reviews
  • ✓ Ongoing support available — reach us anytime via email or live chat

Shipping Information

Bulldog Nutrition ships across Canada and the United States. Most orders are processed within 1 to 2 business days.

Free shipping is available on eligible orders over $100. Please note that drink cases are excluded from free shipping due to size and weight.

During extreme hot or cold weather, heat-sensitive or cold-sensitive items may be affected in transit. For full details, please review our Shipping Policy.

Product & Site Disclaimer

Website information is provided for general informational purposes only. Product details, images, ingredients, and labels may change without notice, so customers should always review the actual product packaging received before use. For full details, please review our Product & Site Disclaimer.

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Need Help?

For the fastest assistance, please use Live Chat on our website. You can also text SUPPORT to 1-833-497-3885 or use our Contact Us page for order, shipping, returns, and general support questions.

Customers rate us 4.7/5 based on 2748 reviews.

Frequently Asked Questions

What is the difference between L-citrulline and L-arginine for nitric oxide?
L-arginine is the direct precursor to nitric oxide, but oral arginine has poor bioavailability — it's degraded in the gut before reaching the bloodstream. L-citrulline bypasses this limitation: it is absorbed intact, converted back to arginine in the kidneys, and delivers a sustained arginine supply for NO production. Research consistently shows L-citrulline raises blood arginine levels more effectively than oral arginine itself.
What is Nitrosigine® and what makes it different?
Nitrosigine® is a patented inositol-stabilized arginine silicate developed by Nutrition 21. Clinical studies show it significantly increases blood arginine and nitric oxide levels within 15 minutes of consumption, with effects lasting up to 3 hours. Silicon from the silicate component adds vascular wall support. It works synergistically with L-citrulline in E-NOS — two different pathways elevating NO simultaneously.
What is the beta-alanine tingling and is it safe?
Beta-alanine causes a harmless skin tingling called paresthesia in many users, typically felt on the face, neck, and hands 15-30 minutes after consumption. It is a normal physiological response to beta-alanine activating certain nerve receptors and is not an allergic reaction. The sensation diminishes with regular use as carnosine levels build. If uncomfortable, split the serving or reduce to a half scoop to start.
Can I stack E-NOS with a stimulant pre-workout?
Yes. E-NOS is specifically designed to complement stimulant-based pre-workouts. You get the energy and focus from your pre-workout, and E-NOS adds the pump, blood flow, and anaerobic capacity components — without adding more caffeine. Stack by taking E-NOS first, then add your pre-workout 10-15 minutes later if desired.
Is E-NOS suitable for use before evening workouts?
Yes — this is one of its primary advantages. Since E-NOS contains no caffeine or stimulants, it will not elevate cortisol, increase heart rate, or disrupt sleep when taken before an evening session. Athletes who train at night can take their full dose without affecting recovery sleep quality.

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