Understanding why a supplement might work starts with understanding the mechanism — what happens in the body when you take it. For male performance supplements, the mechanism almost always comes back to blood flow. Nitric oxide is the molecule at the center of that mechanism, and it's the reason ingredients like L-Citrulline and Pine Bark Extract show up in the most studied formulas in this category. This article breaks down how the verified ingredients in Steel Power are designed to work, using exercise physiology and published research — not marketing copy.
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.
Nitric Oxide: The Foundation of the Mechanism
Nitric oxide (NO) is a gas produced naturally in the endothelial cells lining your blood vessels. It signals the smooth muscle in vessel walls to relax, widening the vessel and increasing blood flow — a process called vasodilation. In an exercise context, this is why pre-workout supplements built around NO precursors help with “pump”: more blood flowing to working muscles means more oxygen and nutrient delivery during exercise and faster clearance of metabolic waste products during recovery.
In a male sexual health context, vasodilation is directly relevant to erectile function. The mechanism of erection is fundamentally vascular — it depends on increased blood flow to erectile tissue. This is why PDE5 inhibitors (pharmaceutical medications) work the way they do, and it's also why certain naturally-occurring NO-supporting compounds have attracted research interest as nutritional support for vascular function. Steel Power's formula targets this pathway through two primary ingredients: L-Citrulline and Pine Bark Extract.
L-Citrulline: The Nitric Oxide Precursor
L-Citrulline is an amino acid that converts to L-Arginine in the kidneys. L-Arginine is the direct substrate for nitric oxide synthase (NOS), the enzyme that produces nitric oxide. This pathway is why L-Arginine was historically used in performance and male health supplements — it feeds directly into NO production.
The reason modern formulas use L-Citrulline instead of L-Arginine is bioavailability. When you take L-Arginine orally, a significant portion is broken down in the intestines and liver (first-pass metabolism) before it reaches circulation. L-Citrulline bypasses this degradation pathway. It enters circulation largely intact, converts to L-Arginine in the kidneys, and delivers a more sustained and higher blood concentration of L-Arginine than L-Arginine supplementation itself does at equivalent doses. The result is more sustained NO production compared to direct L-Arginine supplementation.
L-Citrulline is the first-listed ingredient in Steel Power's 570 mg proprietary blend. Because the blend is proprietary, the exact milligram amount of L-Citrulline is not disclosed. Research on L-Citrulline in male performance contexts typically uses doses in the 1,500 mg to 3,000 mg range. The total blend is 570 mg across six ingredients, which means Steel Power is formulated as a daily maintenance-level support supplement — not a high-dose acute intervention comparable to research doses used in clinical trials.
Pine Bark Extract (Pinus pinaster): Vascular Protection and Synergistic NO Support
Pine Bark Extract from Pinus pinaster is a source of oligomeric proanthocyanidins (OPCs), a class of flavonoid antioxidants. Research published in the Journal of Sexual Medicine examined the combination of Pinus pinaster extract and L-Arginine and found that the combination supported erectile function in men through protection of the endothelial lining of blood vessels. Healthy endothelial cells are what produce nitric oxide via NOS — so protecting that lining is as important as providing the substrate for NO synthesis.
This endothelial-protective role is the synergistic value of Pine Bark Extract alongside L-Citrulline. L-Citrulline increases the substrate available for NO production. Pine Bark Extract helps protect the cellular machinery that produces NO. Together, they address the same vasodilation pathway from two complementary angles.
L-Carnitine: Cellular Energy Metabolism
L-Carnitine is an amino acid derivative that plays a specific structural role in energy metabolism: it transports long-chain fatty acids into the mitochondrial matrix, where they undergo beta-oxidation to produce ATP. Without adequate carnitine, fatty acid oxidation is impaired, and the cell's preferred fuel source for sustained activity becomes less accessible.
In a male performance supplement context, L-Carnitine's primary relevance is endurance — it helps the body access fat as fuel during sustained physical or physiological activity. Research has also examined L-Carnitine in the context of sperm motility and male reproductive health, with several studies suggesting that carnitine plays a structural role in the mitochondria of sperm cells, which are heavily dependent on fatty acid oxidation for motility energy.
Maca Root Extract (Lepidium meyenii): Adaptogenic Stamina Support
Maca Root, from the Peruvian plant Lepidium meyenii, is classified as an adaptogen — a compound traditionally used to support the body's resilience under physical and psychological stress. It has been used in traditional Andean medicine for stamina and vitality for centuries. Research in male health has examined maca primarily in the context of libido and sexual function support, with several studies showing improvements in self-reported sexual desire in men taking maca compared to placebo.
Maca does not appear to work through the same nitric oxide pathway as L-Citrulline and Pine Bark Extract. Its mechanism is not fully characterized in the peer-reviewed literature. The most consistent finding across studies is the impact on perceived libido and sexual desire — a psychological and hormonal dimension of male performance separate from the vascular dimension addressed by L-Citrulline.
Grape Skin Extract (Vitis vinifera) and Saffron Extract (Crocus sativus)
Grape Skin Extract from Vitis vinifera is a source of resveratrol and anthocyanins — polyphenol antioxidants with documented roles in cardiovascular and vascular health. Research supports roles in supporting healthy endothelial function and reducing oxidative stress in blood vessels. In the context of Steel Power's nitric oxide-focused formula, Grape Skin Extract contributes additional vascular antioxidant support, complementing Pine Bark Extract's endothelial protective role.
Saffron Extract from Crocus sativus stigmas is the sixth ingredient in the proprietary blend. Research on saffron in male health has focused primarily on its effects on sexual function and mood, with several studies examining its use in men experiencing sexual dysfunction related to antidepressant use. A meta-analysis published in Human Psychopharmacology found that saffron supplementation was associated with improvements in erectile function scores compared to placebo. The proposed mechanism involves saffron's effects on serotonin and nitric oxide pathways.
Zinc and Vitamin B3: The Micronutrient Foundation
Outside the proprietary blend, Steel Power delivers two labeled micronutrients: Zinc as Zinc Oxide at 11 mg (100% Daily Value) and Vitamin B3 as Niacin at 20 mg (125% Daily Value). These are not window-dressing — they address physiological foundations that support the mechanisms above.
Zinc is an essential mineral for testosterone biosynthesis. Research published in the Journal of Reproduction and Infertility and the International Journal of Molecular Sciences established zinc's essential role in male fertility, testosterone regulation, and sperm health. Zinc deficiency is associated with reduced testosterone levels, and supplementation in zinc-deficient men has been shown to restore testosterone toward normal ranges. Steel Power delivers the full Daily Value of zinc in each capsule.
Vitamin B3 (Niacin) supports NAD+ synthesis — a critical coenzyme in mitochondrial energy production and cellular metabolism. Niacin also has a documented pharmacological effect on lipid metabolism and vascular health at therapeutic doses; at the 20 mg dietary supplement dose in Steel Power, the primary role is supporting baseline cellular energy metabolism.
What This Means for Gym-Going Men
If you train regularly, you already understand blood flow in a workout context. The same vasodilation that drives muscle pump during training is the mechanism that Steel Power's core ingredients support in a daily context. The formula is not designed to deliver acute performance enhancement the way a pre-workout dose of citrulline does — it's formulated as a daily support supplement that maintains the physiological environment where these mechanisms can function optimally over time.
The proprietary blend at 570 mg total across six ingredients means that individual ingredient doses are below what research-validated acute doses typically look like. This formula is best understood as daily nutritional support, not a high-dose intervention. That framing is consistent with how the company positions the product: a daily capsule for men who want to support their baseline function as part of an active lifestyle.
For the full Supplement Facts panel with the label/marketing discrepancy documented, see the Steel Power label breakdown. For the complete product review including pricing and guarantee terms, see the Steel Power review. For safety considerations and interaction risks, see the Steel Power side effects guide. To see how this formula compares to other male performance options in the fitness community, see the male performance supplement comparison.