Norse Fitness | Berserkr Frenzy

Norse Fitness Berserkr Frenzy is a high-stim, performance-first pre-workout built around a very clear formulation strategy: anchor the formula with clinically relevant pump and endurance dosing, then layer in a multi-phase energy and focus system rather than relying on a single oversized caffeine hit. That matters, because a lot of pre-workouts can give you stimulation; far fewer are built to improve the quality of the session itself. Here, the backbone is 6,000mg L-citrulline, 4,000mg beta-alanine, and 2,000mg GlycerSize™ glycerol powder, supported by nootropics, mushroom-derived performance support, and a staggered stimulant profile.

The 6g L-citrulline dose lands exactly in the clinical range most often used in exercise research. Citrulline is more effective than oral arginine for raising arginine availability because it bypasses heavy first-pass metabolism and is converted in the kidneys, where it then supports nitric oxide production through endothelial nitric oxide synthase. In practice, that means more vasodilation, better blood flow, better nutrient delivery, and the fuller training pump users expect from a serious pre. Citrulline also participates in ammonia clearance through the urea cycle, which is one reason properly dosed formulas can help delay that flat, toxic-fatigue feeling in longer sessions.

Beta-alanine at 4g is another standout. Clinical literature supports 3.2-6.4g daily, and this formula exceeds the classic 3.2g threshold. Beta-alanine increases intramuscular carnosine, which buffers accumulating hydrogen ions during high-intensity work. That is not a cosmetic effect. It directly targets the burning fatigue that limits repeated efforts in the one- to ten-minute performance window, from hard hypertrophy sets to interval work and repeated compounds.

GlycerSize™ at 2g is in the effective range for glycerol-supported hyperhydration. Glycerol works osmotically: with enough water, it helps retain fluid and supports fuller muscle volume and better hydration status. Paired with citrulline, it enhances the visual and performance side of the pump by improving both vascular flow and intracellular fluid retention.

The focus complex is intelligently layered. L-tyrosine at 1,000mg provides catecholamine substrate support during stress, helping preserve focus and mental flexibility when training intensity climbs. Choline from Alpha-GPC is listed at 120mg as choline, which is useful but lighter than the doses often seen in dedicated nootropic formulas. That said, it is paired with CognatiQ® whole coffee fruit extract at 600mg, a meaningful dose above the 100-200mg range commonly used in research on acute BDNF elevation and executive function. CognatiQ® is not just “more caffeine”; it is a polyphenol-rich coffee fruit ingredient associated with rapid increases in brain-derived neurotrophic factor, which is one reason formulas using it often feel mentally cleaner and more connected. enXtra® at the full 300mg clinical dose adds non-stimulant alertness support through neurotransmitter-preserving mechanisms, making the caffeine feel more sustained and less jagged.

The stimulant profile is aggressive but better designed than a simple anhydrous dump. You get 300mg caffeine anhydrous for rapid onset, plus 50mg zümXR® extended-release caffeine and 100mg ZumXR® whole coffee fruit extract to stretch the energy curve. Rauwolfia standardized to alpha yohimbine at 2mg pushes urgency and intensity higher; this is effective, but it also clearly moves Berserkr Frenzy into high-stim territory. The mushroom blend is the one area where transparency softens: Cordyceps, Reishi, King Trumpet, Shiitake, Lion’s Mane, and Turkey Tail are present, but their individual amounts are not disclosed because they are part of a proprietary blend. Based on brand context, this appears intended as a PeakO2-style endurance and adaptogenic support matrix, but hidden dosing means it cannot be graded with the same confidence as the disclosed core actives.

Overall transparency is good but not perfect. Most major performance drivers are disclosed clearly and dosed well. The proprietary mushroom section is the only meaningful limitation. Day 1, expect stronger energy, clear onset, noticeable beta-alanine tingles, and a fuller pump once training begins. Over 2-4 weeks of consistent use, beta-alanine loading becomes more valuable as muscle carnosine rises, meaning the formula does more than just feel intense; it increasingly supports repeated high-output performance.