- Formulation Factory Heart of Steel Nitric Oxide Supplements for Men & Women, Nitric Oxide Booster for Blood Flow & Circulation with L-Citrulline 1000mg, L-Arginine, CoQ10 & Resveratrol - 120 Capsules

I’ve been using Heart of Steel for a while now and I’m really happy with how it feels. The energy is smooth and steady without jitters or crashes, which is very important for me. It works well both for workouts and busy days. I like the ingredient profile — it feels well thought out and balanced. I didn’t experience any stomach discomfort or nervousness while taking it. The packaging was secure, the instructions are clear, and the product feels high quality overall. A solid option if you’re looking for a supplement to support energy and endurance. I would definitely purchase again.

I’ve tried a few nitric oxide supplements and this one actually stands out. Within a week I noticed better energy (without jitters) and improved circulation—especially during workouts. I like that it combines L-citrulline, arginine, CoQ10, and resveratrol all in one, so I don’t have to take multiple supplements. Easy to take and no side effects for me. This is a must have additionto my daily routine!

Formulation Factory’s Heart of Steel supplement is a quality product that has improved my energy during my workouts and overall mood! I appreciate that it’s made with high-quality ingredients at an affordable price! I would highly recommend adding this one to your fitness routine!

Really like this supplement so far! It gives me a nice steady boost without feeling too strong and I’ve noticed better energy during workouts. Easy to take and fits well into my daily routine

I’m really impressed with Heart of Steel — it delivers exactly what it promises. The quality of the ingredients is noticeable right away, and the capsules are clean, easy to take, and gentle on the stomach. I’ve felt a big difference in my strength and daily energy. The blend of L-Citrulline, L-Arginine, Ginseng, Ginkgo Biloba, and other nutrient-rich ingredients works incredibly well together. It gives a steady boost without any crash. For the price, this is definitely great value for money. You get a strong, well-balanced formula that actually works. I also noticed an improvement in sleep quality — my body feels more relaxed at night, and I wake up feeling refreshed. Overall effectiveness is a solid 10/10. If you’re looking for a supplement that supports circulation, energy, recovery, and overall performance, this is one of the best I’ve tried. Highly recommended!

I recently began using the Formulation Factory “Heart of Steel: 10-in-1 Metabolic Maximizer” (120-count) and wanted to share my thoughts after a few weeks of consistent use. What I liked: The ingredient transparency is commendable. The label clearly lists doses for key ingredients like L-Citrulline (1000 mg) and L-Arginine (400 mg) alongside others like CoQ10, Resveratrol, Ginseng etc. From a packaging/manufacturer perspective it feels premium: made in a GMP-certified, U.S. facility, no proprietary “mystery blend” terms. After about 3-4 weeks of taking the recommended dose (4 capsules daily, with food) I did notice a subtle increase in endurance and a slight uptick in my energy levels during workouts. While not dramatic, I felt a “cleaner” drive compared to some other pre-workout or general vitality supplements I’ve tried. What could be better / what to watch: The “boost” is subtle. If you’re expecting a shock-and-awe surge of energy or a massive nitric oxide “pump” effect, you may find this more moderate. It seems built more for consistent daily support rather than overnight transformations. Cost per serving: With 120 capsules (60 servings as indicated) and the price point being in the $50–$60 range, it’s not cheap. You’ll want to commit to at least a full month (ideally 3-4 weeks) to judge the effect properly. As with any supplement targeting circulation, nitric oxide, and metabolic support, you’ll want to check compatibility with any existing health conditions or medications (e.g., blood pressure medications) and consult your healthcare provider. The warning is clearly stated. Verdict: If you’re someone who values ingredient transparency and is looking for a well-formulated support supplement for circulation, stamina, and general vitality (rather than a hardcore “pre-workout blast”), Heart of Steel is a strong contender. For my part, I’d give it 3.5 to 4 out of 5 stars - it delivers what it promises, mostly, but doesn’t feel miraculous. If you try it, give it a full month of consistent use and pair it with good sleep, hydration, and nutrition to get the most out of it.

After using this supplement, I feel the difference in my energy levels. I feel more stronger than before. I do take 1 or 2 capsules rather than 4 a day. It varies from person to person. For me 1 or 2 is enough. There is no Odor, nor do I feel any side effects from taking this supplement. Definitely, worth the money!

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.