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Made in the USA in a GMP-Compliant Facility - Manufactured in a GMP-certified, FDA-registered facility with rigorous quality controls at every stage of production.
"Whether I'm running, hiking, or lifting, it keeps me going without any crashes. Easy to take and no aftertaste."
Anna Bilyk
Atlanta, GA
"My muscle recovery is way better. Usually I'd be sore for days after leg day, but now I feel ready to go the next morning."
Naeem Mahmood
Seattle, WA
"The first thing I noticed was my energy level - more awake, focused, and motivated throughout the day."
Ana Paula Lima Silva
Dallas, TX
"Recovery feels quicker, which is a huge win because it helps me stay consistent without burning out."
Brian Pray
Chicago, IL
"My energy feels steady from start to finish, even on my toughest gym days. Recovery is where this product shines."
Haniel Velez Rosario
Miami, FL
Formulation Factory
Heart of Steel
5.0 ★★★★★ (729)
Coupon
20% off coupon applied. First Subscribe & Save order only.
-40%
$3600
- 10 ingredients across 3 bloodflow pillars - pumps blood, opens vessels, strengthens cardiovascular health
- Real doses. No proprietary blends. - Every ingredient and dose printed on the label.
- Made in USA. Formulated in 2026. - Don't fall for a stale formula. #NeverStopImproving
- 60-day money-back guarantee - free shipping on subscriptions and orders $100+
Heart of Steel
The three-pillar approach to bloodflow optimization.
Most cardiovascular supplements stop at one ingredient and call it a day. Heart of Steel doesn't. Because real circulation isn't one thing - it's a system. The body needs to make nitric oxide, keep vessels open, and protect the cells lining them. Miss a step and the rest underperform.
We built Heart of Steel to address all three.
Pillar 1 - Nitric Oxide Production
Nitric oxide is the molecule your blood vessels use to dilate. More NO means better circulation, better pumps, and lower vascular resistance. Two ingredients in Heart of Steel target this pathway directly:
- L-Citrulline - 1,000 mg - the most bioavailable precursor to L-Arginine and a clinically studied driver of NO production
- L-Arginine HCl - 400 mg - the direct substrate for nitric oxide synthase
Full doses of each. Listed on the label.
Pillar 2 - Vasodilation & Circulation
Producing NO is one half of the equation. Keeping vessels open and blood moving is the other. These ingredients support healthy blood flow, vasodilation, and microcirculation:
- Ginkgo Biloba - 200 mg of 10:1 extract - studied for its role in peripheral and cerebral circulation
- Coleus Forskohlii - 100 mg of 10% forskolin extract - traditionally used to support vascular tone
- Capsaicin - 20 mg of 1% extract - supports peripheral blood flow and thermogenesis
Pillar 3 - Cardiovascular Protection
Blood vessels are constantly under oxidative stress. Antioxidants protect endothelial cells and support long-term cardiovascular function. The most overlooked pillar in most cardio formulas:
- CoQ10 (Ubiquinone) - 200 mg of 99% pure - a foundational antioxidant for mitochondrial and cardiovascular health
- Resveratrol - 200 mg of 98% extract - studied for endothelial support and antioxidant capacity
- Quercetin Dihydrate - 200 mg of 95% extract - a flavonoid associated with cardiovascular and circulatory support
What's not in it
- No proprietary blends. Every dose is on the label.
- No unnecessary fillers. No artificial colors.
- No fairy dust. Real doses of every ingredient.
What's behind it
- Manufactured in an FDA-registered, GMP-certified facility
- Every lot third-party tested
- Full label disclosure on the bottle and the website
Who it's for
Heart of Steel is built for people who already train, already eat well, and want a research-backed formula that supports the cardiovascular system at every level. If you're looking for a stim-loaded pre-workout, this isn't it. If you want a foundational daily formula built on how circulation actually works, you're in the right place.
Supplement Facts
Serving Size: 4 Capsules
Servings Per Container: 30 servings
Amount Per Serving
% Daily Value
L-Citrulline
1000 mg
†
L-Arginine
400 mg
†
CoQ10
200 mg
†
Resveratrol
200 mg
†
Ginkgo Biloba
200 mg
†
Quercetin Dihydrate
200 mg
†
Panax Ginseng
100 mg
†
Rhodiola Rosea
100 mg
†
Coleus Forskohlii
100 mg
†
Capsicum Annuum
20 mg
†
† Daily Value not established.
Other Ingredients: See product label for full other ingredient information.
Results build with consistent usage over time.
Consult a qualified healthcare professional before use if you are pregnant, nursing, taking medication, or have an existing medical condition. Discontinue use and seek medical advice if any adverse reaction occurs.
Not intended for persons under 18. Keep out of reach of children. Store in a cool, dry place away from direct sunlight.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Individual results may vary. Content on this page is for informational purposes only and is not a substitute for professional medical advice.
What is inside
Fully Dosed. Fully Transparent. Maximum Strength.
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L-Arginine 400 mg
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CoQ10 200 mg
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Resveratrol 200 mg
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Ginkgo Biloba 200 mg
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Quercetin Dihydrate 200 mg
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Panax Ginseng 100 mg
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Rhodiola Rosea 100 mg
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Coleus Forskohlii 100 mg
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Capsicum Annuum 20 mg
The science
Backed by clinical research
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L-Citrulline & Blood Pressure / Nitric Oxide
A meta-analysis confirmed L-citrulline supplementation significantly reduces systolic and diastolic blood pressure by increasing nitric oxide bioavailability.
Read the study (opens in a new tab) -
CoQ10 & Cardiovascular Mortality (Q-SYMBIO)
The Q-SYMBIO RCT found CoQ10 supplementation significantly reduced major adverse cardiovascular events and cardiovascular mortality over 2 years.
Read the study (opens in a new tab) -
Quercetin & Endothelial Function
A randomized crossover trial showed quercetin reduced blood pressure and improved endothelial function markers in hypertensive adults.
Read the study (opens in a new tab)
The Real Cost of Health
One Bottle Replaces 10 Supplements.
See what you're actually spending - and what you could keep.
Ingredient
Dose
Buying separate
-
10 individual products - per month
Various brands
Included
Monthly total10 separate supplements
-
-
2-Month total- - Subscribe & Save
-
-
Per month equivalentCost per 30 days
-
-
Serving size
4 Capsules
Per container
30 servings servings
Supply
1-month supply
Per day (sub price)
-
Subscribe & Save Today
Cancel anytime - Locked-in rate
Individual supplement prices reflect the median one-time retail price for a 30-day supply of comparable single-ingredient capsules sold on Amazon. Prices researched and may vary. Subscribe & Save pricing reflects a permanent 20% discount off list price. Cancel anytime.
What People Are Saying
Heart of Steel
What to Expect.
This isn't a pre-workout. It's a cardiovascular systems formula.
Day 1
First Dose
What you may notice
Some users notice increased vascularity or a mild warmth during training. Others feel nothing yet — both are normal.
What is happening internally
L-Citrulline begins converting to arginine, supporting nitric oxide production. Capsaicin activates thermogenic pathways acutely. These are the fastest-acting ingredients in the stack.
Week 1–2
Building the Base
What you may notice
Pumps may feel fuller during training. Some notice improved endurance or sustained energy without a crash.
What is happening internally
Citrulline and arginine are working synergistically on nitric oxide production. Ginkgo Biloba begins supporting peripheral circulation. CoQ10 is starting to support mitochondrial energy output.
Week 3–4
Circulation Rising
What you may notice
Noticeable improvement in workout output and recovery between sessions.
What is happening internally
CoQ10 and Quercetin are supporting antioxidant defense and vascular function. Resveratrol is contributing to endothelial health. The cardiovascular stack is now operating as a complete system.
Week 5–6
System Support
What you may notice
Recovery between sets and sessions feels different — you're bouncing back faster.
What is happening internally
Rhodiola Rosea is actively supporting stress adaptation and reducing exercise-induced fatigue. Coleus Forskohlii may be supporting cardiovascular tone and metabolic efficiency. Ginseng is contributing to sustained energy regulation.
Week 7–8
Full Capacity
What you may notice
This is the new baseline — cardiovascular performance, endurance, and recovery are all operating at a higher level.
What is happening internally
Long-term vascular support compounds including CoQ10, Resveratrol, and Ginkgo have reached steady-state concentration. Consistent daily use maintains and compounds these systemic benefits over time.
Common Questions
Questions? We have answers.
Questions? We have answers.
Need to Know
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