Prosupps | Hyde NightmareProsupps
- SuppVault Score
- 93/100

Prosupps
300mg tri-source caffeine with disclosed pump, focus, and endurance support.
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Hyde Nightmare is a high-stim pre-workout pairing hard energy with usable focus and real gym-performance support. It combines 300mg total caffeine, 4,000mg L-citrulline, beta-alanine, theanine, and electrolytes in a fully disclosed formula.
Prosupps publishes test results from independent third-party labs. Svpplements links to the manufacturer’s data — we don’t test products ourselves.
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Hyde Nightmare already covers energy, blood flow, and some endurance support, but it does not include creatine. Adding 3-5g creatine monohydrate daily complements beta-alanine well by supporting phosphocreatine regeneration for repeated high-power efforts while beta-alanine helps buffer acidity during those same sets.
Take daily; can be taken with Hyde Nightmare pre-workout or any other convenient time.
The Himalayan rock salt in Hyde Nightmare gives you a useful hydration foundation, but longer sessions or heavy sweat loss often demand more sodium, potassium, and fluid support. An intra-workout hydration formula extends the pump and performance feel that citrulline and sodium help initiate pre-workout.
Sip during training, starting once your workout begins.
Hyde Nightmare prepares you to train harder; protein helps turn that harder training into recovery and adaptation. A high-quality whey isolate post-workout provides essential amino acids, especially leucine, to support muscle protein synthesis after the high-output session this formula is designed to create.
Use after training or anytime daily protein intake needs support.
Because Hyde Nightmare’s 4g citrulline is effective but not maxed, a stim-free pump product can deepen the blood-flow side without increasing stimulant load. This is especially useful for advanced users who love the energy profile of Hyde Nightmare but want more nitric oxide support, cell hydration, or glycerol-style fullness.
Take alongside Hyde Nightmare pre-workout, adjusting total ingredient load based on tolerance.
A high-stim pre-workout creates more training drive, but sleep is where the adaptation happens. If you use Hyde Nightmare later in the day, a dedicated non-stimulant sleep/recovery product can help offset the downside of residual caffeine on sleep quality and recovery consistency.
Use 30-60 minutes before bed, well separated from your pre-workout serving.
It likely offers a more premium, broader-loaded high-stim formula with stronger category leadership.
Hyde Nightmare has a cleaner straightforward high-stim profile with strong disclosed core actives.
Both fit experienced users wanting a serious pre-workout with real performance support.
Hyde Nightmare balances high energy with theanine and a transparent, familiar ingredient set.
Side-by-side against the closest competitors. Score reflects clinical dosing, transparency, and testing.
Prosupps | Hyde NightmareProsupps
Alpha Lion | SH Elite | 42 ServingsAlpha Lion
It likely offers a more premium, broader-loaded high-stim formula with stronger category leadership.
Compare side-by-side →
Cellucor | C4 Ultimate | 20 ServingsCellucor
Hyde Nightmare has a cleaner straightforward high-stim profile with strong disclosed core actives.
Compare side-by-side →
Core Nutritionals | Fury Pre | 20 ServingsCore Nutritionals
Both fit experienced users wanting a serious pre-workout with real performance support.
Compare side-by-side →Comparison data combines live storefront pricing with our SuppVault analysis. Competitor scores reflect public-label data; manufacturer-side changes may not be reflected in real time.
Prosupps Hyde Nightmare is a high-stim pre-workout built around a very clear formulation strategy: deliver aggressive but still familiar stimulant energy, pair it with enough calming focus support to stay usable, and reinforce training output with core ergogenic ingredients for blood flow, buffering, and hydration. This is not a stim-only formula hiding weak performance support behind flashy branding. It uses a fully disclosed panel and leans on ingredients with established sports nutrition relevance.
The backbone of the performance side is 4,000mg of L-citrulline. Citrulline is converted to L-arginine in the kidneys more efficiently than taking arginine itself, which then supports nitric oxide production through endothelial nitric oxide synthase. The result is improved vasodilation and blood flow, with the added benefit of helping clear ammonia through the urea cycle during hard training. The strongest research-backed range for exercise applications is typically 6-8g, so 4g sits below the classic clinical target, but it is still a meaningful dose that should contribute to better pumps and working-muscle blood delivery, especially when combined with the formula’s stimulant and hydration support.
Beta-alanine is included at 2,500mg. Mechanistically, beta-alanine raises intramuscular carnosine over time, and carnosine buffers hydrogen ions generated during high-intensity work. That buffering matters most in efforts lasting roughly one to ten minutes, where acidosis contributes to the familiar burning fatigue. The best-studied daily range is 3.2-6.4g, so 2.5g is below the standard clinical benchmark but still substantial enough to contribute if used consistently. You may also notice the classic tingling sensation shortly after ingestion; that paresthesia is common and not harmful.
For focus and energy, Hyde Nightmare uses a tri-source caffeine system totaling 300mg: 125mg natural caffeine from Camellia sinensis extract, 75mg caffeine anhydrous, and 75mg natural caffeine from Coffee arabica extract. Caffeine works primarily by antagonizing adenosine receptors, increasing alertness, perceived energy, and exercise performance. The 200-400mg range is well established in the literature, and 300mg lands squarely in the effective zone for most trained users. The use of both anhydrous and naturally sourced caffeine is less about changing caffeine’s core mechanism and more about shaping the feel of the energy profile.
That stimulant load is balanced with 100mg L-theanine, a clinically relevant dose that complements caffeine well. Theanine modulates glutamatergic signaling, increases alpha-wave activity, and promotes a more composed state of alertness. In practice, this is what helps the formula feel more focused and less ragged than a straight 75mg caffeine hit. Alpha-GPC at 200mg adds a cholinergic component, supplying a precursor for acetylcholine to support attention, motor drive, and mind-muscle connection, though it sits below the more robust nootropic dosing seen in higher-end focus formulas. Acetyl-L-carnitine HCl at 250mg contributes modestly to cognitive and mitochondrial support, but this is a supportive rather than headline dose. Himalayan rock salt at 250mg rounds the formula out with sodium and trace minerals that support fluid balance, muscle contraction, and workout hydration.
The synergy here is straightforward and effective: caffeine drives output, theanine smooths the stimulant experience, Alpha-GPC sharpens focus, citrulline supports blood flow, beta-alanine helps resist the burn over time, and salt improves hydration and pump feel. Importantly, the label is fully disclosed with no proprietary blends, which is still a competitive advantage in pre-workout. Day 1, expect strong energy, cleaner focus than the caffeine total suggests, noticeable tingles, and a moderate pump. Over 2-4 weeks of regular use, the beta-alanine component becomes more meaningful as muscle carnosine rises, making repeated hard sets feel more sustainable.
L-citrulline raises plasma arginine more efficiently than oral arginine because it bypasses substantial intestinal and hepatic extraction. The resulting increase in arginine availability supports endothelial nitric oxide synthase activity and downstream nitric oxide production. That promotes vasodilation, blood flow, and a fuller working-muscle sensation during training. Citrulline also participates in the urea cycle, which may assist ammonia handling during repeated efforts.
Beta-alanine is the rate-limiting precursor for carnosine synthesis in skeletal muscle. Carnosine acts as an intracellular buffer, helping resist the pH drop associated with high-intensity glycolytic exercise. This is why beta-alanine is most relevant for repeated hard sets, intervals, and longer high-effort work where acidosis contributes to fatigue. Acute tingling is sensory, but the ergogenic value comes from chronic tissue loading over weeks.
Caffeine primarily acts as an adenosine receptor antagonist, increasing alertness, motivation, and perceived readiness to train. L-theanine modulates excitatory signaling and is often used to smooth subjective overstimulation without nullifying caffeine's performance benefits. In combination, the pairing can support a more controlled attentional state than caffeine alone. For gym use, that may translate to strong drive with less mental scatter.
Alpha-GPC is a choline donor that can increase substrate availability for acetylcholine synthesis. Acetylcholine is central to attention, motor signaling, and neuromuscular communication, making cholinergic support relevant for demanding training sessions. While dose-response can vary, Alpha-GPC is commonly included to sharpen focus and improve the sense of mind-muscle connection. Its value is greatest when paired with stimulants rather than used as a stand-alone performance driver.
Verified athletes can view NCAA, WADA, and high-school compliance status for this product.
* These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Consult your physician before use if you have a medical condition or take medications.
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