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Every Lot Third-Party Tested
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Heart of Steel

★★★★★ 5.0 from 703+ Reviews 250K+ customers served
Supplement Capsules 30 servings

Heart of Steel

HEART OF STEEL is your ultimate metabolic optimizer, crafted to enhance circulation, endurance, and cardiovascular performance. With L-Citrulline, L-Arginine, and CoQ10 at its core, this formula boosts nitric oxide levels, promoting blood flow and sustained energy for workouts and daily demands. Whether you’re an athlete pushing limits or optimizing long-term vitality, this supplement ensures your body performs like an unstoppable machine.

Cardiovascular Health Blood Flow & Circulation Endurance & Stamina Heart Health Oxygen Delivery

Simple by Design

Take 2 capsules in the morning with food. L-Citrulline and CoQ10 absorb best with a meal, and morning dosing supports blood flow and cardiovascular function throughout your active hours.

Take daily and consistently. Cardiovascular and metabolic benefits compound over time — most users report improved endurance and workout recovery within 2–3 weeks.

Serving Size
4 Capsules
Servings
30 servings
Supply
1-month supply

Results build with consistent usage over time.

What's Inside

Every ingredient was chosen with purpose. No filler, no underdosed afterthoughts.

L-Citrulline 1000mg

Energizes cells, supports heart health
L-Arginine 400mg

Improves circulation, supports nitric oxide
CoQ10 200mg

Enhances blood flow, boosts endurance
Resveratrol 200mg

Enhances stamina, combats stress
Ginkgo Biloba 200mg

Increases energy, reduces fatigue
Quercetin Dihydrate 200mg

Boosts metabolism, supports fat loss
Ginseng 100mg

Ignites thermogenesis, aids weight control
Rhodiola Rosea 100mg

Improves memory, sharpens focus
Coleus Forskholii 100mg

Fights inflammation, boosts immunity
Capsaicin 20mg

Protects cells, supports longevity

The Research Behind It

Every key ingredient in Heart of Steel is backed by peer-reviewed research. Below are selected studies relevant to this formula.

Study 01

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.

View on PubMed

Study 02

CoQ10 & Cardiovascular Mortality (Q-SYMBIO)

The Q-SYMBIO RCT found CoQ10 supplementation significantly reduced major adverse cardiovascular events and cardiovascular mortality over 2 years.

View on PubMed

Study 03

Quercetin & Endothelial Function

A randomized crossover trial showed quercetin reduced blood pressure and improved endothelial function markers in hypertensive adults.

View on PubMed

These statements have not been evaluated by the FDA. Research citations are provided for informational purposes and do not constitute medical claims for this product.

Supplement Facts

Serving Size: 4 Capsules

Servings Per Container: 30 servings

Amount Per Serving % Daily Value
L-Citrulline1000mg†
L-Arginine400mg†
CoQ10200mg†
Resveratrol200mg†
Ginkgo Biloba200mg†
Quercetin Dihydrate200mg†
Ginseng100mg†
Rhodiola Rosea100mg†
Coleus Forskholii100mg†
Capsaicin20mg†
† Daily Value not established.
Other Ingredients: See product label for full other ingredient information.

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.

Formula
10 synergistic ingredients.
Tested
Every lot third-party tested and publicly published.
Transparent
No proprietary blends. No unnecessary fillers. Every dose on the label.
Guarantee
60-day guarantee with dedicated support to ensure results.
Third-party tested & certified
GMP Lab Tested Non-GMO Made in USA
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My Vitality Is Back

I'm in my 40s and finally found an edge that gives me stamina without the shakes or jitters. It’s a natural evolution, not a quick fix—I trusted the process, and hitting the full mark unlocked a level of energy and heart health I haven't felt in years

Henry Davis J.
Henry Davis J. Verified Buyer