Heart of Steel: 10-in-1 Metabolic Maximizer Nitric Oxide Supplement, Blood Pressure Support, L Arginine, L Citrulline Natural Pre-Workout: Energy Management 120 Count | ⭐ Flexiology.Store Recommended
$59.99
🌿 Expert Tip: Handpicked for natural health, wellness & beauty.
Price: $59.99
(as of Oct 07, 2025 21:24:13 UTC – Details)
From the brand
Welcome to Formulation Factory—where mediocrity ends and excellence begins.
As 2025’s boldest supplement brand, we craft stacked formulas for alpha men & women who refuse to settle. Unapologetic and scientifically perfected, our products fuel your body and mind to conquer any challenge.
Join a community of relentless achievers—men and women who redefine limits and demand transparency in every capsule. Greatness isn’t given; it’s forged.
How did we get our start?
After a near-death accident left our founder battling PTSD and depression, he created life-changing supplements on his countertop. Word-of-mouth success then sparked our birth.
What makes our products unique?
Cutting-edge tech + expertise = transformative, science-backed botanical supplements. Leveraging 2025’s innovation for life-changing results.
What problem are we solving?
Many brands hide behind misleading proprietary blends, but we prioritize transparency, crafting science-backed, family-trusted products built for US—because you deserve to know what you’re taking.
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Package Dimensions : 3.11 x 2.68 x 2.6 inches; 4.66 ounces
Item model number : HOS1
Date First Available : October 16, 2024
Manufacturer : Formulation Factory
ASIN : B0DK61GRD2
Best Sellers Rank: #21,626 in Health & Household (See Top 100 in Health & Household) #54 in Sports Nutrition Nitric Oxide Boosters
Customer Reviews: 4.6 4.6 out of 5 stars 498 ratings var dpAcrHasRegisteredArcLinkClickAction; P.when(‘A’, ‘ready’).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‘acrLink-click-metrics’, ‘click’, { “allowLinkDefault”: true }, function (event) { if (window.ue) { ue.count(“acrLinkClickCount”, (ue.count(“acrLinkClickCount”) || 0) + 1); } } ); } }); P.when(‘A’, ‘cf’).execute(function(A) { A.declarative(‘acrStarsLink-click-metrics’, ‘click’, { “allowLinkDefault” : true }, function(event){ if(window.ue) { ue.count(“acrStarsLinkWithPopoverClickCount”, (ue.count(“acrStarsLinkWithPopoverClickCount”) || 0) + 1); } }); });
THE TIN MAN PROBLEM – Strong outside, hollow inside. Energy collapsed. Drive vanished. Like the Tin Man, many men today feel the weight of stress and burnout.
THE TURNING POINT – The answer wasn’t more caffeine or quick fixes. It was restoring blood flow, nitric oxide, and cellular energy — the true spark of vitality.
10-IN-1 METABOLIC MAXIMIZER – L-Citrulline, L-Arginine, CoQ10, Resveratrol, Ginseng, Ginkgo Biloba, Rhodiola, Quercetin, Forskolin, Capsaicin. A powerhouse blend for circulation and stamina.
TRUSTED RESULTS – From the gym to daily life, thousands of men rely on HEART OF STEEL to push past fatigue and reclaim their edge. Third-party tested. Transparent label.
PURE QUALITY – Manufactured in an FDA-registered, GMP-certified USA facility. No proprietary blends. No fluff. Just premium ingredients in every capsule.
CONSISTENCY MATTERS – Supplements work gradually. For best results, take daily as directed. Most people begin to notice benefits with consistent use over 3–4 weeks.
YOUR SATISFACTION MATTERS – We back every bottle. Questions or concerns? Reach out through Amazon messages — our team is here to help.
Customers say
Customers find this supplement provides consistent energy throughout the day and enhances workout effectiveness, with one noting significant results within days of use. The product receives positive feedback for its clean ingredients, including L-Arginine and L-Citrulline, and customers appreciate that it provides a natural boost without jitters. They report improved focus, mental clarity, and endurance, while also considering it worth the money.
🌿 Expert Tip: Selected by our Flexiology Experts for quality & value.
⚠️ Disclaimer: Information is for educational purposes and not a substitute for medical advice. Consult your physician before use. Flexiology.Store is not responsible for any adverse effects.
8 reviews for Heart of Steel: 10-in-1 Metabolic Maximizer Nitric Oxide Supplement, Blood Pressure Support, L Arginine, L Citrulline Natural Pre-Workout: Energy Management 120 Count
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$ailorMom –
Great product!
I’ve been using Heart of Steel (10-in-1 Metabolic Maximizer) from Formulation Factory for several weeks now, and I’m genuinely impressed. ✅ What I Loved• Noticeable energy boost – Without feeling jittery, I get a clean, sustained lift in motivation and stamina throughout the day (or during workouts).• Improved circulation & “pump” – The nitric oxide blend (L-Citrulline, L-Arginine) delivers a real difference in blood flow and vascular “fullness.”• Supports heart health – Ingredients like CoQ10, resveratrol, and ginseng feel like a thoughtful touch for cardiovascular support. • Recovery & reduced fatigue – After long or intense sessions, soreness seems to fade faster, and I bounce back quicker.• Clean formulation & transparency – No hidden proprietary blends. Everything is disclosed, and the product is GMP-certified, made in a USA facility. ⚠️ Minor Considerations• You’ll need to take 4 capsules per day at full dose, which is a bit bulky. • As always with supplements, consult your healthcare provider first, especially if you have blood pressure or heart conditions.• The product is a bit premium in price, but in my experience the performance justifies it.💬 Final ThoughtsHeart of Steel is not just another “booster” — it delivers on its promises and feels like a well-rounded, premium formula. If you’re after more vigor, better circulation, and real performance gains, I wholeheartedly recommend giving this one a shot.
Jenn C –
Boosted Energy & Blood Pressure Support – Love It!
I’ve been using Heart of Steel for a few weeks, and it’s been amazing. I feel more energized during workouts and throughout the day without jitters. The blend of L-Arginine and L-Citrulline really helps with blood flow and supports healthy blood pressure.It’s a solid natural pre-workout that also aids metabolism and overall energy management. Great quality, easy to take, and noticeable results. Highly recommend for anyone wanting a clean energy boost and heart support!
marknapril –
Impressive Results – Boosted My Energy and Focus!
I’ve been using Heart of Steel capsules for about three weeks now, and I’m genuinely impressed. I initially bought them looking for a natural way to enhance my energy levels and focus during workouts and busy workdays—and they’ve definitely delivered.What I love most is that the energy boost feels clean—no jittery crashes or weird side effects. I’ve noticed better endurance during my gym sessions, and I also feel more mentally sharp throughout the day. It’s been a game changer for productivity.The capsules are easy to take and don’t have any weird aftertaste. Also, I appreciate that the ingredients are transparent and seem to be of high quality. I’ll definitely be ordering another bottle once I run out.Highly recommend if you’re looking for a supplement to help you push through both physically and mentally.
Genesis –
Boosts Energy and Supports Overalls Wellness’s
I purchased Heart of Steel: 10-in-1 Metabolic Maximizer Nitric Oxide Supplement as a birthday gift for my brother. He’s been complaining lately about not having enough energy when he wants to do certain things, so I thought this would be a great product for him to try. He’s actually really eager to start using it, and I’m excited to see how it helps with his energy and overall performance. This seemed like the perfect gift to support his health and motivation. The benefits🔽🔽🔽Energy support – L-Arginine & L-Citrulline help promote blood flow, which can support stamina and reduce fatigue.Blood pressure support – The nitric oxide boost may help with circulation and healthy blood pressure levels.Workout performance – Can act as a natural pre-workout, giving endurance and strength support.Overall wellness – Ingredients promote heart health and better oxygen delivery to muscles.
Elva Jenkins –
First-Time Try – Heart of Steel
This was my first time trying Heart of Steel, and I honestly didn’t know what to expect. I grabbed it mainly for the energy and metabolism support, and I’ve got to say—it really came through.After a couple of days, I started noticing I wasn’t crashing midday like I usually do. My focus felt sharper, and I had more stamina during workouts. I wasn’t dragging myself through sets or yawning halfway through my day. It kind of gives you that extra edge without feeling jittery or overhyped.What stood out to me was how packed the formula is—stuff like L-Citrulline, Ginseng, Rhodiola, and CoQ10. Solid ingredients you actually recognize. And it’s not just physical energy, it also helped clear up the mental fog a bit.All in all, feels like a clean upgrade. Not a miracle pill, but definitely helps me show up with more drive. I’ll keep using it and see how it goes long-term, but first impression? Solid choice.
Raven –
Better energy and less daily fatigue
Enhanced my energy levels, blood flow, and overall vitality. So far I noticed a steady increase in endurance during workouts and improved recovery times, allowing me to push harder and feel less fatigued afterward .Beyond physical benefits, I noticed improved mental clarity and focus, making daily tasks feel less overwhelming. The convenience of having a comprehensive supplement meant I didn’t need to juggle multiple products throughout the day. The capsules are easy to swallow with no unpleasant aftertaste, and the minimalist packaging adds a premium touch to my daily routine. Overall, Heart of Steel has seamlessly integrated into my wellness regimen, providing a natural and effective approach to energy management and cardiovascular support.
chase doucette –
Great Supplement!
Heart of Steel gives me great workout energy without the crash. The pump feels solid, and my blood pressure’s been more stable too. Easy to take, and the 120 count lasts a while
Iryna Havryk –
Great supplement
I feel more energy and focus during my workouts. It’s easy to take and really helps with blood flow. I’m happy with the results so far