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Last Updated: May 2026
The SigMedical Insights Team's standard for any supplement analysis is the verified Supplement Facts panel. This is the legally required disclosure under DSHEA — the complete list of every active ingredient in the product, with amounts per serving. What the panel shows and what the marketing describes are sometimes two different lists. In Steel Power's case, they are.
This article covers every verified ingredient on the Steel Power Supplement Facts panel with the relevant published research at the individual compound level. It also documents the two ingredients the brand promotes in its marketing copy that are absent from the label. For the full editorial assessment and purchasing evaluation, see the Steel Power review. For safety and contraindication considerations, see Is Steel Power Safe?
The Verified Supplement Facts Panel
Serving size: 1 capsule. Servings per container: 30.
Individually disclosed ingredients: Vitamin B3 (as Niacin) — 20 mg — 125% Daily Value. Zinc (as Zinc Oxide) — 11 mg — 100% Daily Value.
Proprietary blend (570 mg total): L-Citrulline, L-Carnitine, Pine (Pinus pinaster) Bark Extract, Maca (Lepidium meyenii) Root Extract, Grape (Vitis vinifera) Skin Extract, Saffron (Crocus sativus) Stigmas Extract.
Other ingredients: Hypromellose (Vegetable Capsule), Microcrystalline Cellulose, Magnesium Stearate, Silicon Dioxide.
That is the complete active ingredient list. Tribulus Terrestris and Panax Ginseng — described in the brand's marketing ingredient section — do not appear on this panel.
The Marketing vs. Label Discrepancy
Multiple sections of the steelpower.shop website describe Tribulus Terrestris and Panax Ginseng as active ingredients, with explanations of their mechanisms. Competitor review sites have repeated these descriptions as factual ingredient analysis. The Supplement Facts panel contradicts this. Neither ingredient appears anywhere on the verified label.
The Supplement Facts panel is the only ingredient disclosure that carries regulatory weight under DSHEA. Marketing copy does not. When evaluating a dietary supplement, the panel is the document that matters. The SigMedical Insights Team documents this discrepancy transparently because it directly affects consumer research: any review that evaluates Steel Power's Tribulus or Ginseng content is not evaluating the product that ships to customers. This is the SERP gap that most Steel Power coverage leaves unfilled.*
L-Citrulline — Nitric Oxide Pathway Support
L-Citrulline is the first ingredient listed in the proprietary blend, which under FDA labeling rules means it is present in the largest amount among the six blend ingredients. It is a non-essential amino acid that converts to L-Arginine in the kidneys. L-Arginine is a substrate for endothelial nitric oxide synthase (eNOS), the enzyme that produces nitric oxide — a signaling molecule that relaxes smooth muscle in blood vessel walls, causing vasodilation and improved circulation.
The ingredient-level research is substantive. A 2018 pilot study published in Urology found that a combination including L-Citrulline supported improvements in erectile function in men with mild to moderate erectile dysfunction. A systematic review and meta-analysis published in Frontiers in Pharmacology examined L-Arginine (the downstream metabolite of L-Citrulline) and Pycnogenol (French maritime pine bark extract) in combination and identified significant improvement in erectile function scores across multiple randomized controlled trials.
The critical limitation: clinical studies on L-Citrulline for circulatory support typically use 3,000 to 6,000 mg daily. The entire Steel Power proprietary blend totals 570 mg for six ingredients. Even at maximum concentration, the L-Citrulline dose is well below studied thresholds. Whether it produces a meaningful circulatory effect at this dose is not established by the published literature.*
Pine (Pinus pinaster) Bark Extract — Vascular Antioxidant
Pine bark extract (typically standardized from Pinus pinaster, the French maritime pine) contains proanthocyanidins — a class of polyphenolic compounds with antioxidant properties relevant to vascular endothelial health. The extract has been studied in combination with amino acids for erectile function support.
A randomized, double-blind, crossover trial published in Minerva Urologica e Nefrologica evaluated a combination of French maritime pine bark extract with L-Arginine and L-Citrulline in 50 men with moderate erectile dysfunction and found restoration of erectile function to normal IIEF scores after one month of treatment. A meta-analysis published in Frontiers in Pharmacology corroborated these findings across multiple RCTs using the pine bark extract and amino acid combination.
Mechanistically, pine bark extract inhibits the activity of angiotensin-converting enzyme (ACE) and augments eNOS activity, synergizing with L-Citrulline's nitric oxide pathway support. This is the strongest two-ingredient mechanistic pairing in the Steel Power formula. The dose limitation from the proprietary blend structure applies here as well.*
Maca (Lepidium meyenii) Root Extract — Libido and Adaptogenic Support
Maca is a Peruvian adaptogenic root with four randomized controlled trials in the published literature relevant to male libido and sexual well-being. A landmark 12-week double-blind placebo-controlled trial published in Andrologia found men taking 1.5 to 3 grams of maca daily reported significantly increased sexual desire beginning at 8 weeks, compared to placebo. Crucially, this improvement occurred without changes in testosterone, LH, FSH, or estradiol levels — indicating maca works through non-hormonal pathways, likely via the hypothalamic-pituitary-adrenal axis and unique compounds called macamides and macaenes found only in this plant.
A 2010 systematic review published in BMC Complementary and Alternative Medicine identified suggestive evidence of maca's effectiveness for male sexual dysfunction while noting study quality limitations and the need for larger, longer-duration trials. A separate RCT in 50 men with mild erectile dysfunction found statistically significant improvements in sexual well-being scores after 12 weeks of maca supplementation at 2.4 grams daily.
The studied doses (1.5 to 3 grams daily) are again substantially higher than what can plausibly be delivered in a 570 mg total blend. The mechanistic case for maca in this formula is legitimate. The dose case is uncertain.*
Zinc (as Zinc Oxide) — 11 mg (100% DV)
Zinc is an essential mineral with well-established roles in male reproductive health, testosterone metabolism, sperm production, and immune function. The 11 mg dose in Steel Power meets 100% of the recommended daily intake — a clinically appropriate nutritional support dose. Research has demonstrated that zinc deficiency is associated with reduced serum testosterone and impaired sperm quality, and that repletion of zinc in deficient men supports restoration of normal testosterone function. Steel Power's zinc dose is the most straightforwardly evidence-supported element of the formula, at an established, fully disclosed amount.*
Vitamin B3 (as Niacin) — 20 mg (125% DV)
Niacin is essential for cellular energy metabolism via the NAD+ and NADH coenzyme pathways. The 20 mg dose is a nutritional-support level — above the Daily Value but far below the pharmacological doses (typically 1,000 to 3,000 mg) studied for cardiovascular effects such as vasodilation and HDL cholesterol support. At 20 mg, this is an energy metabolism ingredient, not a vascular pharmacological agent. The inclusion is appropriate for a male vitality formula; the dose is modest.*
L-Carnitine — Energy Metabolism Support
L-Carnitine is a naturally occurring compound that transports long-chain fatty acids into mitochondria, where they are oxidized for energy production. It has been studied for exercise performance, fatigue reduction, and recovery. Research has also explored L-Carnitine's role in sperm motility and male reproductive health. The individual dose in Steel Power's blend is undisclosed. L-Carnitine is included in an appropriate ingredient context for a male vitality formula.*
Grape (Vitis vinifera) Skin Extract — Polyphenolic Antioxidant
Grape skin extract is a source of resveratrol, anthocyanins, and other polyphenolic antioxidants associated with cardiovascular health support and endothelial function. Research on resveratrol and grape-derived polyphenols has identified potential benefits for vascular health through antioxidant and anti-inflammatory pathways. The inclusion supports the formula's circulatory positioning. Individual dose undisclosed.*
Saffron (Crocus sativus) Stigmas Extract — Mood and Sexual Health
Saffron is listed last in the proprietary blend, indicating it is present in the smallest amount. Small-scale randomized trials have explored saffron supplementation for mood support and male sexual health, with some finding improvements in erectile function and sexual satisfaction scores. The mechanistic pathway is not fully established, and most saffron trials use 30 mg per day — a dose almost certainly not reached by the last-listed ingredient in a 570 mg total blend. The inclusion is mechanistically relevant but dose-limited.*
The Dose Transparency Problem
The proprietary blend structure is the central analytical limitation for Steel Power. Six ingredients share 570 mg. For reference, clinical research benchmarks: L-Citrulline at 3,000-6,000 mg, Maca at 1,500-3,000 mg, L-Carnitine at 1,000-2,000 mg. The entire blend is 570 mg. The honest reading of this label is that each ingredient is present at a fraction of its studied dose — the formula contains the right ingredients for its intended mechanism, but the blend architecture makes dose-dependent efficacy claims impossible to substantiate from the label.*
This is not a problem unique to Steel Power. The majority of multi-ingredient male vitality supplements in the $49-$79 per bottle price range use similar proprietary blend architecture. It is worth understanding when setting expectations.*
Frequently Asked Questions
What ingredients are in Steel Power?
Vitamin B3 (Niacin) 20 mg, Zinc 11 mg, and a 570 mg blend of L-Citrulline, L-Carnitine, Pine Bark Extract, Maca Root Extract, Grape Skin Extract, and Saffron Extract. Tribulus Terrestris and Panax Ginseng appear in marketing copy but not on the Supplement Facts panel.*
Does Steel Power have enough L-Citrulline to work?
Unknown from the label. The 570 mg total blend is substantially below the 3,000-6,000 mg doses used in L-Citrulline clinical trials. The mechanism is valid; the dose is uncertain.*
Is Zinc in Steel Power effective for testosterone support?
Yes at this dose for nutritional support. Zinc at 11 mg (100% DV) is appropriate for supporting testosterone metabolism and male reproductive health. This is the most clearly evidenced element of the formula.*
What does Maca Root do in Steel Power?
Maca has RCT support for modest improvements in male libido via non-hormonal pathways. The studied dose (1.5-3g/day) is likely not reached in this blend. Mechanism is real; dose is uncertain.*
Why are Tribulus Terrestris and Ginseng missing from the label?
The Supplement Facts panel — the legally binding ingredient disclosure — does not list them. The marketing copy does. The SigMedical Insights Team writes to the panel only. Consumers should evaluate this product on what the label confirms.*
*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.
Related analysis from the SigMedical Insights Team: Steel Power Review | What Is Steel Power? | Is Steel Power Safe? | Steel Power vs. Alternatives
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