Repp Sports | Arimivar

Repp Sports Arimivar is a narrowly targeted hormone-support formula built around one primary active: Androsta-3,5-Diene-7,17-Dione at 50mg, commonly known as Arimistane. This is not a general testosterone booster and it is not a multi-pathway PCT kitchen-sink formula. The formulation strategy is minimalist and direct: use a single endocrine-focused compound intended to reduce aromatase activity and pair it with N-Acetyl Cysteine at 400mg for antioxidant and glutathione support. Based on archived label context, this product was designed for users chasing a drier, harder look and seeking estrogen-control support rather than stimulant-driven gym performance.

The center of the formula is Arimistane at 50mg. Mechanistically, Arimistane is marketed as an aromatase-inhibiting steroidal compound, meaning it is intended to reduce the conversion of testosterone into estrogen by interfering with the aromatase enzyme. In practical terms, that is why products in this category are used by physique-focused athletes who are concerned about estrogen-related water retention, softer appearance, or the downstream hormonal feel that can come with aggressive training or certain supplementation strategies. The key caveat is evidence quality: unlike ingredients with robust human sports-nutrition data, Arimistane has limited high-quality human clinical research in healthy lifters. So while 50mg is a meaningful active dose within supplement-market norms for this ingredient, it is still a category where real-world use has outpaced strong published evidence.

N-Acetyl Cysteine at 400mg serves a very different role. NAC is a precursor to cysteine, which supports glutathione synthesis, one of the body’s central endogenous antioxidant systems. That matters because hard training, caloric deficits, and physiologic stress increase oxidative burden. NAC is better studied than Arimistane, with common research dosing often starting around 600mg and extending much higher, so 400mg is below the more established standalone range. That said, it is still a rational inclusion as supportive infrastructure rather than the headline mechanism of the formula. Users are unlikely to “feel” NAC acutely, but its role is biochemical support, not sensory impact.

As a system, the logic is straightforward: Arimistane is the driver, NAC is the support. One ingredient targets estrogen metabolism; the other helps maintain antioxidant capacity during a period where users are often dieting hard, training intensely, or otherwise imposing recovery stress. There are no proprietary blends here, which is a genuine positive. In a category that often hides behind vague “estrogen control matrices,” Repp Sports chose to disclose the actives and doses that matter.

What should you expect? Day 1 is usually subtle. This is not a pre-workout and not a feel-it-in-20-minutes formula. Over 2-4 weeks, users who respond to this category typically report changes in dryness, perceived hardness, and less of the softer, puffier look associated with higher estrogen activity. The more important expectation is realism: this is a specialized endocrine-support product with a sparse formula and limited clinical depth behind its primary active, not a guaranteed transformation. For the right advanced user, that focus is exactly the appeal.