If you want to evaluate a supplement properly, you start with the label — not the marketing page. The marketing page is the company's sales pitch. The Supplement Facts panel is the legal disclosure. When the two don't match, the label wins. This article gives you a line-by-line breakdown of what the Steel Power Supplement Facts panel actually says, what each listed ingredient is, what the published research at the individual compound level suggests about it, and why two ingredients that appear in Steel Power's website marketing descriptions are not on the verified panel.
These statements have not been evaluated by the Food and Drug Administration. Steel Power is not intended to diagnose, treat, cure, or prevent any disease. Consult a qualified healthcare professional before starting any new supplement.
The Label/Marketing Discrepancy: What You Need to Know First
Before the ingredient-by-ingredient breakdown, this needs to be stated clearly. The Steel Power website's ingredient section and FAQ describe and reference: L-Citrulline, L-Carnitine, Pine Bark Extract, Maca Root Extract, Tribulus Terrestris, and Panax Ginseng. The verified Supplement Facts panel lists: L-Citrulline, L-Carnitine, Pine Bark Extract, Maca Root Extract, Grape Skin Extract, and Saffron Extract.
Tribulus Terrestris and Panax Ginseng do not appear on the Supplement Facts panel. Grape Skin Extract and Saffron Extract appear on the Supplement Facts panel but are not prominently featured in the website's ingredient descriptions. Multiple third-party reviewers on the SERP are citing Tribulus and Ginseng as active Steel Power ingredients — that is incorrect based on the verified label. This page writes to the label only.
Serving Size and Container Information
Serving Size: 1 capsule. Servings Per Container: 30. Capsule shell: Hypromellose (vegetable capsule). Other ingredients: Microcrystalline Cellulose, Magnesium Stearate, Silicon Dioxide.
The vegetable capsule makes Steel Power suitable for men who avoid gelatin-based supplements. Microcrystalline Cellulose is a standard filler/binder used in capsule manufacturing. Magnesium Stearate is a lubricant that helps ingredients flow through encapsulation equipment. Silicon Dioxide is an anti-caking agent. These are standard excipients — not active ingredients.
Vitamin B3 (as Niacin) — 20 mg — 125% Daily Value
Niacin is a B-vitamin essential for NAD+ and NADP+ synthesis — coenzymes involved in over 400 enzymatic reactions in the body, including mitochondrial energy production (oxidative phosphorylation) and DNA repair. Every cell in the body requires NAD+ to function.
At 20 mg, Steel Power delivers 125% of the Daily Value. This is a dietary supplement dose, not a therapeutic dose. Niacin at high therapeutic doses (500 mg to 3,000 mg, typically prescribed for lipid management) can cause “niacin flush” — a temporary skin flushing response. At 20 mg, flushing is not expected in most individuals. Men who are sensitive to niacin at any dose should be aware that individual responses vary.
Zinc (as Zinc Oxide) — 11 mg — 100% Daily Value
Zinc is an essential trace mineral. For male reproductive health specifically, zinc has one of the strongest research bases of any micronutrient in this category. Research published in the Journal of Reproduction and Infertility established zinc's essential role in male fertility, sperm quality, and testosterone regulation. A 2020 review in the International Journal of Molecular Sciences further characterized zinc's roles in male fertility and sperm function at the molecular level.
Steel Power uses Zinc Oxide as the zinc source. Zinc Oxide has moderate bioavailability — it is absorbed less efficiently than zinc picolinate or zinc citrate forms used in some other supplements. At 11 mg (100% DV), Steel Power covers baseline zinc needs from the supplement, though men with significant zinc deficiency may benefit from a more bioavailable form at higher doses under clinical guidance.
Important: Do not take Steel Power simultaneously with other zinc-containing supplements unless you track your total daily zinc intake. The Tolerable Upper Intake Level (UL) for zinc is 40 mg per day for adults. Exceeding this regularly can cause copper depletion and gastrointestinal effects. At 11 mg per day from Steel Power, you have significant headroom — but stacking multiple zinc-containing supplements can push you toward or past the UL.
Proprietary Blend — 570 mg total
The proprietary blend contains six ingredients listed in order of predominance by weight. Individual amounts are not disclosed. The total blend is 570 mg per capsule.
L-Citrulline (first in blend — highest amount by weight)
L-Citrulline is an amino acid and the primary nitric oxide precursor in the formula. It converts to L-Arginine in the kidneys, which feeds directly into nitric oxide synthase (NOS) to produce nitric oxide. Nitric oxide signals blood vessel walls to relax, widening the vessel and increasing blood flow. For the full mechanistic explanation of why L-Citrulline is used instead of L-Arginine directly, see the Steel Power ingredients explainer.
Research-validated doses for L-Citrulline in performance and vascular support contexts typically range from 1,500 mg to 3,000 mg per day. The total Steel Power blend is 570 mg across six ingredients. L-Citrulline, as the first-listed ingredient, is present in the highest amount within the blend — but even if it represented 50% of the blend (a favorable assumption), that would be 285 mg. This is below research-validated doses for acute performance effects. Steel Power is positioned as a daily support supplement rather than an acute performance intervention, which is the appropriate framing for this dose level.
L-Carnitine (second in blend)
L-Carnitine is an amino acid derivative that transports long-chain fatty acids into the mitochondrial matrix for beta-oxidation and ATP production. It supports cellular energy metabolism and has published research in the context of sperm motility and male reproductive mitochondrial function. Research doses for L-Carnitine in male fertility contexts typically range from 1,000 mg to 3,000 mg per day — substantially higher than what the proprietary blend structure allows at 570 mg total.
Pine Bark Extract — Pinus pinaster (third in blend)
Pinus pinaster bark extract is a source of oligomeric proanthocyanidins (OPCs) — antioxidant flavonoids that protect the endothelial lining of blood vessels. Research published in the Journal of Sexual Medicine examined the combination of Pinus pinaster extract and L-Arginine supplementation and found that the combination supported erectile function in men by maintaining endothelial integrity. Pine Bark Extract complements L-Citrulline's NO-precursor role by protecting the endothelial cells that produce nitric oxide.
Maca Root Extract — Lepidium meyenii (fourth in blend)
Maca Root is a Peruvian plant used for centuries in traditional medicine for stamina and vitality. Research has primarily examined its effects on libido and sexual desire in men, with several randomized controlled trials showing improvements in self-reported sexual desire compared to placebo. A systematic review in BMC Complementary Medicine found that maca improved sexual dysfunction and sexual desire in both men and women. Maca's mechanism is not fully characterized — it does not appear to work through testosterone elevation or the same NO pathway as L-Citrulline.
Grape Skin Extract — Vitis vinifera (fifth in blend)
Grape Skin Extract is a source of resveratrol and anthocyanins — polyphenol antioxidants with documented roles in cardiovascular and vascular health. Research supports roles in maintaining endothelial function and reducing oxidative stress in blood vessels. In the context of this formula, Grape Skin Extract provides complementary vascular antioxidant support alongside Pine Bark Extract. Note that this ingredient does not appear prominently in the Steel Power marketing copy, despite being on the verified label.
Saffron Extract — Crocus sativus Stigmas (sixth in blend — lowest amount by weight)
Saffron Extract from Crocus sativus stigmas is the final ingredient in the proprietary blend. Published research has examined saffron in the context of male sexual function, with a meta-analysis in Human Psychopharmacology finding that saffron supplementation was associated with improvements in erectile function scores compared to placebo in men experiencing sexual dysfunction. The proposed mechanism involves saffron's effects on serotonin and nitric oxide pathways. Saffron is also one of the more expensive botanical ingredients by weight, which may explain its position as the smallest-quantity ingredient in the blend given the product's price point.
Frequently Asked Questions
Does Steel Power contain Tribulus Terrestris?
Tribulus Terrestris does not appear on the Steel Power Supplement Facts panel. It appears in the website's ingredient description section, but it is not listed as an ingredient in the verified formula. Content on this page is written exclusively to the Supplement Facts panel.
Does Steel Power contain Panax Ginseng?
Panax Ginseng does not appear on the Steel Power Supplement Facts panel. Like Tribulus Terrestris, it appears in some website marketing descriptions but is not listed on the verified label. The six ingredients in the proprietary blend are L-Citrulline, L-Carnitine, Pine Bark Extract, Maca Root Extract, Grape Skin Extract, and Saffron Extract.
What is the total dose of the Steel Power proprietary blend?
The Steel Power proprietary blend totals 570 mg per capsule across six ingredients. Individual amounts within the blend are not disclosed. For context on how this total compares to research-validated doses for individual ingredients, see the Steel Power ingredients explainer.
Is Steel Power gluten-free?
Steel Power uses a hypromellose vegetable capsule and does not list gluten-containing ingredients on its label. The company's website states the formula is non-GMO. Individuals with celiac disease or severe gluten sensitivity should confirm directly with the manufacturer before use.
For the complete product review with pricing and guarantee terms, see the Steel Power review. For the mechanistic explanation of how these ingredients work at the physiological level, see the ingredients and blood flow explainer. For safety considerations, see the Steel Power side effects guide. To compare this formula against other male performance options, see the male performance supplement comparison.