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With the Formulation Factory Heart of Steel Nitric Oxide Supplement - L, Formulation Factory aims to offer quality nutrition that fits your lifestyle.
Get ready to train harder — this pre-workout packs a purposeful ingredient lineup.
Formulation Factory's pre-workout blend designed to enhance energy, focus, and workout performance.
Formulated to help sustain energy levels throughout your day or workout.
Suitable for vegetarians, so you can supplement confidently on a plant-inclusive diet.
Strikes a good balance between quality ingredients and reasonable pricing.
Typically ranges from $44–$51 — a competitive price point for the US market.
Overall, a worthy contender in the pre workout space from Formulation Factory.
The brand behind this product — their story and what they stand for.
US-based supplement brand offering pre-workout supplements.
Understand which fitness goals this product is best suited for.
Energy & Performance
Designed to fuel intense workouts and sustain energy levels throughout your training session.
General Health
A solid addition to your daily wellness routine, supporting overall nutrition and vitality.
Track how the price has changed over the last 90 days on Amazon.com.
Step-by-step usage instructions so you get the most out of every serving.
Mix 1 serving with 200–250ml of cold water.
Consume 20–30 minutes before your training session.
Start with half a scoop to assess your caffeine tolerance.
Avoid taking pre-workout within 5–6 hours of bedtime to prevent sleep disruption.
See how this product compares to similar options in its category.
| This Product | Nutrex Research | Leviathan Nutrition | Insane Labz | |
|---|---|---|---|---|
| Price | $59.99 | $24.99 | $71.98 | $19.95 |
| Per Serving | - | - | - | - |
| Servings | — | — | — | — |
| Lab Tested | ✗ | ✓ | ✗ | ✗ |
| Rating | 4.6 ★ | 4.4 ★ | 4.2 ★ | 4.1 ★ |
Common questions about this product — answered clearly and honestly.
Yes, this product is vegetarian-friendly. It does not contain any non-vegetarian ingredients.
As of our last check, this product does not have publicly listed third-party lab testing. Look for brands that offer Trustified, NABL, or Labdoor certifications for verified purity.
You can, but it's advisable to cycle off every 6–8 weeks to prevent caffeine tolerance buildup. On rest days, you may not need it. Start with half a scoop to assess your tolerance, especially if you're sensitive to caffeine.
Nutrex Research
Outrage Ultra HIGH STIM Pre-Workout Powder for Men | 400mg Caffeine, L-Citrulline, Beta-Alanine, Creatine | Extreme Energy, Focus, Strength & Endurance (30 Servings, Strawberry Watermelon)
Leviathan Nutrition
Leviathan Nutrition Hemo Flow | Supplement with Nattokinase for Nitric Oxide
Insane Labz
Insane Labz Psychotic Black Edition Mid Stimulant Pre Workout Powder, Energy Focus Pumps, Loaded with Creatine Beta Alanine Taurine Fueled by AMPiberry, 35 Servings (Gummy Candy)
Micro Ingredients
Micro Ingredients Beet Root | 360 Softgels with MCT Oil | Highly Bioavailable | Max Strength | Super Beets Supplements | Fresh Beetroot Extract
In-depth guides and articles to help you make a more informed choice.
