This article may contain affiliate links. PerformixHouse.com may earn a commission on purchases made through these links, at no additional cost to you. This does not influence our editorial evaluations. 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.
The Steel Power Ingredient List, Taken From the Label
Before breaking down mechanisms, a baseline is worth establishing: the ingredient analysis below is built entirely from the verified Steel Power Supplement Facts panel, not the product marketing page. The reason this distinction matters is covered in the main Steel Power review, but the short version is that two ingredients featured prominently in Steel Power's marketing copy are absent from the verified label. This guide covers only what is actually in the capsule.
The verified panel: Vitamin B3 (as Niacin) 20mg, Zinc (as Zinc Oxide) 11mg, and a 570mg proprietary blend listing in order: L-Citrulline, L-Carnitine, Pine Bark Extract, Maca Root Extract, Grape Skin Extract, and Saffron Extract. Each ingredient is addressed below. For anyone who trains and cares about the mechanisms behind their supplement stack, this is the complete picture.
L-Citrulline: The Nitric Oxide Pathway
L-Citrulline is listed first in the proprietary blend, which by convention indicates it is the largest component by weight within the 570mg total. It is also the most mechanistically relevant ingredient for blood flow support in this formula. L-Citrulline is an amino acid that converts to L-Arginine in the kidneys. L-Arginine is the substrate that nitric oxide synthase enzymes use to produce nitric oxide — the signaling molecule that drives vasodilation. Wider blood vessels mean improved circulation, better oxygen delivery to working muscles, and the sustained blood flow that underpins both physical endurance and male performance.
The reason formulas use L-Citrulline rather than L-Arginine directly is an absorption issue. Oral L-Arginine has poor bioavailability — a significant portion is metabolized by the liver and gut before reaching systemic circulation. L-Citrulline bypasses this first-pass degradation and produces a more sustained plasma arginine elevation. Human trials on citrulline and citrulline-malate have documented reduced time-to-fatigue, improved endurance performance, and post-exercise recovery benefits. This is one of the most research-supported ingredients in the performance supplement category. The site's blood circulation supplement guide covers nitric oxide mechanisms in further depth.
L-Carnitine: Cellular Energy Metabolism
L-Carnitine is the second ingredient in the blend. Its primary role is transporting long-chain fatty acids across the mitochondrial membrane so they can enter the beta-oxidation pathway and be converted into ATP. This mechanism is particularly relevant for endurance — the ability to sustain physical output over longer duration rather than producing explosive short-term power. In a male performance supplement context, L-Carnitine contributes to the energy availability side of the formula rather than the blood flow side. It is not a stimulant and does not produce the acute energy surge associated with caffeine. Its effect is metabolic and gradual. Some research has also examined L-Carnitine's role in sperm motility and male reproductive function, though dose-dependent effects in that context require careful review.
Pine Bark Extract (Pinus pinaster): Antioxidant and Vascular Support
Pine Bark Extract, standardized from Pinus pinaster, is one of the more studied botanical antioxidants in the cardiovascular support category. It is rich in oligomeric proanthocyanidins (OPCs), which protect the endothelial lining of blood vessels from oxidative damage. Healthy endothelial function is essential for maintaining the nitric oxide response — damaged or inflamed endothelium produces less nitric oxide and responds less effectively to vasodilatory signals. In that sense, Pine Bark Extract supports the L-Citrulline mechanism rather than operating in parallel with it. Some studies examining a combination of Pycnogenol (a standardized Pine Bark Extract brand) with L-Arginine have shown improvements in erectile function scores in men with mild-to-moderate erectile dysfunction. The exact standardization of the Pine Bark in Steel Power's formula is not disclosed on the label, which limits precision analysis. The full label analysis article explores the standardization question in detail.
Maca Root Extract (Lepidium meyenii): Adaptogenic Libido Support
Maca Root has the longest traditional use history and the most human-trial data for libido and vitality support of any ingredient in this formula. Multiple controlled trials in adult men have documented improvements in sexual desire with Maca supplementation, typically at doses of 1.5g to 3g daily over periods of 8 to 12 weeks. Importantly, Maca's libido-supporting effect appears to be independent of testosterone levels — study participants did not show significant testosterone elevation alongside improved desire scores, suggesting a different mechanism, possibly involving the plant's unique glucosinolate compounds. This is notable because it separates Maca from the category of testosterone boosters and positions it as a direct desire-support botanical. For gym-focused men who may have normal testosterone but experience reduced drive, this mechanism is directly relevant.
Grape Skin Extract (Vitis vinifera): Antioxidant and Cardiovascular Support
Grape Skin Extract provides resveratrol, quercetin, and additional OPC compounds with antioxidant and anti-inflammatory activity. Its cardiovascular benefits center on protecting LDL cholesterol from oxidation, supporting healthy platelet function, and contributing to the overall vascular antioxidant environment that maintains nitric oxide bioavailability. Grape Skin Extract is less commonly discussed in the male performance supplement space than some of the other ingredients here, which is part of why it does not appear in most competitor analyses of Steel Power. Most of those analyses are built from the marketing copy, which does not mention it. The ingredient is a legitimate antioxidant inclusion with an established cardiovascular support rationale, even if it is not the headline mechanism in this formula. For broader context on herbal compounds in male vitality formulas, see this site's herbal supplement guide.
Saffron Extract (Crocus sativus): Emerging Research in Male Sexual Function
Saffron is the most unusual inclusion in this formula and the one with the most emerging rather than established evidence base. Published research on saffron and male sexual function includes randomized controlled trials examining its effects on desire, satisfaction, and specific aspects of sexual response. A 2012 trial in men with antidepressant-associated sexual dysfunction found improvements in several domains with saffron supplementation. A separate study in healthy volunteers showed improved erectile function parameters. These are small-scale studies and the mechanisms are not fully characterized, but the direction of evidence is consistent. The active compounds implicated include safranal and crocin, which appear to modulate serotonergic and dopaminergic pathways. For a formula that includes well-characterized nitric oxide precursors and a botanically supported adaptogen, Saffron is an interesting complementary inclusion with a different mechanism profile.
Vitamin B3 (Niacin) and Zinc: The Labeled Actives
Niacin at 20mg (125% DV) supports NAD+ biosynthesis and energy metabolism. At pharmacological doses (1,000mg+), niacin has cardiovascular data including HDL elevation and flushing-associated vasodilation. At 20mg, it is a maintenance-level daily input, not a therapeutic dose. Its inclusion is consistent with a formula focused on metabolic function and daily energy support. Zinc at 11mg (100% DV) is the most directly testosterone-relevant ingredient on the label with the most dosing transparency. Zinc deficiency is one of the few nutritional factors with a clear causal link to reduced testosterone production. A daily supplement delivering 100% DV zinc addresses this without supplementing beyond reasonable upper limits. For men whose dietary zinc is inconsistent — common in high-training-volume populations — this is a meaningful baseline correction.
How the Ingredients Work Together
The formula has three functional layers. The first is the nitric oxide and blood flow layer: L-Citrulline as the precursor, Pine Bark Extract as the endothelial protector, and Grape Skin Extract as a secondary antioxidant contributor. The second is the libido and desire layer: Maca Root as the primary mechanism, with Saffron Extract adding a complementary pathway. The third is the metabolic and micronutrient layer: L-Carnitine for fatty acid utilization, Niacin for energy metabolism, and Zinc for testosterone system support. These three layers address circulation, desire, and baseline male health nutrition in a single daily capsule — a reasonable stack for men looking for comprehensive daily support rather than a single-mechanism product. For information on interactions and safety considerations for each ingredient, see the safety review.
For a comparison of how this ingredient stack positions Steel Power against other male performance supplements on the market, see the Steel Power comparison guide. For the complete label audit including the marketing discrepancy documentation, see the Supplement Facts label analysis.
The site's muscle recovery supplement guide provides additional context on L-Carnitine and amino acid supplementation for performance-oriented men.
*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.*