Inspired Nutraceuticals | FSU Nitrum | Liquid Non-Stim Pre-Workout

Inspired X V1 Nutra FSU NITRUM is a stim-free pump and hydration formula built around one clear objective: make training feel fuller, more vascular, and more repeatable without relying on caffeine. The formulation strategy is straightforward and performance-oriented. Instead of stuffing the label with ten underdosed botanicals, it centers on a small number of ingredients that directly influence nitric oxide production, plasma volume, cell hydration, and training output. That gives this product a cleaner identity than most “pump blends” in the category.

The backbone is 3,000mg of L-Citrulline. Citrulline works by bypassing first-pass liver metabolism and converting to arginine in the kidneys, which then feeds endothelial nitric oxide synthase to increase nitric oxide production. That matters because nitric oxide drives vasodilation, improving blood flow and nutrient delivery to working muscle. Research-backed sports dosing is typically 6-8g, so 3g is below the classic standalone clinical range, but it is still a meaningful inclusion—especially in a formula that also uses glycerol and S7® rather than asking citrulline to do all the work alone. In practice, expect a noticeable but not extreme NO contribution from citrulline here.

Glycerol is dosed at 2,000mg, which lands inside the useful evidence-based range for hyperhydration support. Glycerol acts as an osmotic agent, pulling and retaining water across intracellular and extracellular compartments. The user experience is different from a purely NO-driven pump: muscles look and feel rounder, fuller, and better hydrated rather than just superficially vascular. Plasma volume support can also improve thermoregulation and reduce the sense of “drying out” during harder sessions. If you train in hot conditions or run long hypertrophy sessions, glycerol is one of the most practical ingredients in this formula.

Betaine anhydrous at 1,000mg contributes additional osmotic support and performance utility. Betaine helps regulate cellular hydration and has literature supporting power output, work capacity, and body composition at higher daily intakes, most commonly around 2.5g. So 1g is not a full clinical standalone dose, but it makes mechanistic sense here because it reinforces the hydration and volumization theme created by glycerol.

S7® is included at 50mg, which is the studied dose. This trademarked botanical nitric oxide blend has manufacturer-funded human data showing a substantial acute increase in circulating nitric oxide from a single 50mg dose, plus longer-term reductions in reactive oxygen species. Mechanistically, S7® appears to support endogenous NO by reducing the oxidative degradation that normally shortens nitric oxide’s lifespan. That makes it a smart pairing with citrulline: one ingredient helps generate NO, the other helps preserve it.

The vitamin panel is functional rather than flashy. Vitamin C at 100mg adds antioxidant coverage. Niacinamide at 20mg supports NAD/NADP-dependent energy metabolism without the classic flush associated with nicotinic acid. Vitamin B6 at 20mg, folate at 680mcg DFE, and methylcobalamin B12 at 500mcg support red blood cell formation, methylation, and general energy metabolism. These are not the main event, but they round out the formula well.

Synergy is where this product earns its place. Citrulline supports nitric oxide generation, S7® helps sustain NO bioavailability, glycerol expands hydration status and muscle fullness, and betaine strengthens the osmolyte/hydration side of the formula. The result is a more complete pump profile than a simple citrulline-only product.

Transparency is a strong point. There is no proprietary blend hiding the active doses, and that matters in a category full of labels that obscure whether you’re getting meaningful amounts. The limitation is equally clear: citrulline and betaine are useful here, but both sit below their best-studied standalone sports doses.

What to expect: on day one, most users will notice improved fullness, better hydration during training, and a cleaner pump profile without stimulant edge. Over 2-4 weeks of consistent use, the benefit is less about “loading” and more about repeatedly showing up to sessions better hydrated, better perfused, and more consistent set to set.