Dark Labs | Crack Diamond | 25 Servings

Dark Labs Crack Diamond Edition is an extreme high-stim pre-workout built around one clear idea: deliver an unmistakably intense training experience while giving just enough pump and endurance support to keep the session productive, not just overstimulated. This is not a balanced daily-driver formula and it is not pretending to be. The formulation strategy is aggressive CNS stimulation first, with a respectable supporting cast for blood flow, buffering, and focus.

The foundation starts with 5,000mg L-citrulline. Citrulline raises plasma arginine more efficiently than oral arginine itself, feeding the arginine-nitric oxide pathway and supporting vasodilation, blood flow, and muscle oxygen delivery. Research commonly lands in the 3-8g/day range, with many performance-focused users preferring 6g+, so 5g sits in the useful zone: not the most fully loaded pump dose in the category, but absolutely meaningful. You should expect fuller muscle bellies, better nutrient delivery, and some counterbalance to the vasoconstrictive side of the stimulant stack.

Beta-alanine is dosed at 5,000mg, which is above the classic 3.2g daily benchmark used in many carnosine-loading protocols. Beta-alanine works by increasing intramuscular carnosine, which buffers hydrogen ions during high-intensity work. Translation: less of that acidic burn that forces sets to end early. The first thing you notice acutely is the tingling paresthesia. The real performance value builds over weeks of consistent use as muscle carnosine rises.

L-tyrosine at 1,000mg is here for catecholamine support. Tyrosine serves as a precursor for dopamine and norepinephrine, making it a logical partner to heavy stimulant formulas where sustained focus matters. While the strongest human data often uses higher doses, 1g is still a common practical inclusion for pre-workout focus support, especially alongside caffeine.

Agmatine sulfate at 1,000mg adds another layer to the pump-and-focus profile. Agmatine interacts with nitric oxide signaling and neurotransmission, and at 1g it is firmly dosed in a range many experienced users recognize for denser pumps and a more locked-in training feel.

Then the formula turns unmistakably extreme. Caffeine is layered across 350mg anhydrous, 100mg di-caffeine malate, and 350mg caffeine citrate, yielding 474mg total caffeine from the metadata calculation. That matters because these forms behave differently in the real world: anhydrous hits hard, citrate tends to feel fast, and di-caffeine malate can help smooth and extend the curve. On top of that, 250mg 2-aminoisoheptane (DMHA) dramatically escalates the stimulant profile. Human oral safety data on DMHA is limited, but in practical sports supplement use it is known for prolonged, forceful energy and appetite-suppressive, adrenergic-like intensity. Beta-PEA at 500mg adds a fast, euphoric, short-lived lift; theobromine at 150mg broadens the stimulant feel with a smoother, longer tail; halostachine at 100mg adds further adrenergic drive; and 75mg kanna extract brings a distinct mood-and-focus angle that can make the experience feel more elevated than raw caffeine alone.

Bioperine® at 15mg rounds the formula out as an absorption-support inclusion, helping with ingredient uptake. Importantly, this is a full-disclosure label with no proprietary blend, which matters in a category where many exotic-stim products hide exact amounts. Here, you can evaluate every major active directly.

Day 1, expect a strong onset, pronounced beta-alanine tingles, elevated urgency, mood lift, and a long-lasting stimulant arc. Over 2-4 weeks, the cumulative change comes mainly from beta-alanine loading, with better repeat-effort tolerance and less early shutdown from high-rep acidosis. Crack Diamond Edition is best understood as a transparent, fully disclosed extreme pre-workout: impressive for stimulant veterans, excessive for almost everyone else.