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"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

4.8 ★★★★★ (246)

~~$59.99~~ One-time purchase

~~$36.00~~ 40% off Sub & Save

Coupon 20% off coupon applied. First Subscribe & Save order only.

-60% $24⁰⁰

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.

Take 4 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.

WARNING: Risk of cancer and reproductive harm from exposure to lead. See www.P65Warnings.ca.gov/food

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.

Trusted by 250,000+ customers

L-Citrulline 1000 mg
Energizes cells, supports heart health
L-Arginine 400 mg
Improves circulation, supports nitric oxide
CoQ10 200 mg
Enhances blood flow, boosts endurance
Resveratrol 200 mg
Enhances stamina, combats stress
Ginkgo Biloba 200 mg
Increases energy, reduces fatigue
Quercetin Dihydrate 200 mg
Boosts metabolism, supports fat loss
Panax Ginseng 100 mg
Ignites thermogenesis, aids weight control
Rhodiola Rosea 100 mg
Improves memory, sharpens focus
Coleus Forskohlii 100 mg
Fights inflammation, boosts immunity
Capsicum Annuum 20 mg
Protects cells, supports longevity

Day 1 · Phase 1 of 5

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.

Peer-reviewed

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.

PubMed Read the study (opens in a new tab)
Peer-reviewed

CoQ10 & Cardiovascular Mortality (Q-SYMBIO)

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

PubMed Read the study (opens in a new tab)
Peer-reviewed

Quercetin & Endothelial Function

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

PubMed Read the study (opens in a new tab)

4.8

Rated 4.8 out of 5 stars

Based on 246 reviews

Total 5 star reviews: 213 Total 4 star reviews: 29 Total 3 star reviews: 4 Total 2 star reviews: 0 Total 1 star reviews: 0

98%would recommend this product

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246 reviews

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MV
Monica V.
Verified Buyer
I recommend this product
Rated 5 out of 5 stars
1 month ago
Solid, noticeable results
Didn't expect much, but this actually made a difference after a couple of weeks. My energy feels more steady (no jitters), and I've noticed better focus during the day. I also like that it has more than just the basic ingredients. Not an instant fix, but worth it if you stay consistent.
Was this helpful?
R
Rafaela
Verified Buyer
I recommend this product
Rated 5 out of 5 stars
1 month ago
Improved energy and vitality
I was pleasantly surprised by this supplement; it really gave me a boost in energy. I used to feel very tired and fatigued while working, but honestly, ever since I started taking it, I feel incredibly energetic and full of vitality.
Was this helpful?
C
ckbarb
I recommend this product
Rated 5 out of 5 stars
2 months ago
Finally - Th Ingredients I Need
This supplement is packed with some great ingredients. It’s hard to find another that has this kind of versatility due to the vast number of ingredients. Definitely worth checking out and giving it a try.
Was this helpful?
JL
Jorge l. R.
I recommend this product
Rated 5 out of 5 stars
2 months ago
100% recommended
I've tried different kinds of products from different brands, and this is the one I've found that's 100% perfect. I recommend it to everyone and stop looking for other kinds. I've tried different ones for years, and none of them work like this one.
Was this helpful?
RC
Raquel C. M.
I recommend this product
Rated 5 out of 5 stars
2 months ago
Works well with my wellness routine
I’ve been using Heart of Steel as part of my daily routine to support my overall health. I live an active lifestyle, so I’m always looking for supplements that can help with stamina and keep my body feeling strong.
Was this helpful?

Our Promise

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No proprietary blends

Who should take HEART OF STEEL?

HEART OF STEEL is made for anyone who needs more out of their body and brain — whether you're lifting heavy, grinding through long workdays, or just want to feel more alive in your skin. It's built for both men and women who want better endurance, faster recovery, cleaner energy, and serious support for heart and metabolic health.

What results can I expect — and how fast?

Most users notice better blood flow, stamina, and energy within the first 1–2 weeks. Over time, you’ll feel more consistent endurance during workouts, quicker recovery, and less midday crash. Because it’s stimulant-free, the effects are steady—not spiked—so think performance that builds, not burns out.

How does HEART OF STEEL support endurance and performance?

Ingredients like L-Citrulline and L-Arginine ramp up nitric oxide levels, improving blood flow and oxygen delivery to muscles. Rhodiola and Ginseng help fight fatigue and mental burnout. The result? More reps, more focus, and more grind — without needing a pre-workout every time.

How does it help with cardiovascular health and recovery?

CoQ10, Resveratrol, Quercetin, and Ginkgo all support vascular function, heart health, and antioxidant defense. That means smoother circulation, lower inflammation, and better recovery after tough sessions. You’re not just building muscle — you’re building resilience.

Is it safe to take with other supplements or long-term?

Yes. HEART OF STEEL uses clean, natural ingredients that are safe for daily use and stack well with most fitness or wellness supplements. No hormones, no weird side effects. It’s designed for consistent, long-term results. As always, if you’re taking meds or have a condition, check in with your doctor.

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Heart of Steel