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Formulation Factory's Heart of Steel is a 10-in-1 nitric oxide and metabolic support supplement featuring L-Citrulline, L-Arginine, CoQ10, and more. Designed to enhance blood flow, energy, and endurance, it supports heart health and helps combat fatigue. Manufactured in a GMP-certified USA facility with transparent labeling, it’s trusted by thousands seeking sustained vitality and performance.





| Additives | l_citrulline |
| Units | 120 count |
| Brand | Formulation Factory |
| Format | Capsule |
| Age Range Description | Adult |
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