SKULL LABS® Skull Crusher Stim-Free is the caffeine-free pump pre built for sessions that still need blood in the muscle — not another empty daily-energy sipper that leaves the bar quiet. Official Skull Labs positioning is blunt: a powder food supplement with citrulline malate, beta-alanine and taurine for physically active adults, and FA shop copy sells it straight as the pre you run when stimulants stay off the table — evening lifts, double days, or any block where sleep still matters.
If the caffeinated Skull Crusher is the high-stim lane, this is the same brand intensity without the buzz. Retail positioning calls it a stimulant-free pre-workout for lifters who want pump density at night without fighting the pillow later. No caffeine on the label. No stim stack to manage. Just the pump-and-burn matrix Skull Labs put on the tub.
Every ~2-scoop serve (17.5 g) loads a serious core: 6000 mg citrulline malate (4000 mg citrulline), 3200 mg beta-alanine, and 1500 mg L-arginine alpha-ketoglutarate (A-AKG) — 1050 mg L-arginine. Same scoop stacks 1000 mg each of betaine, taurine and glyceryl monostearate — the volume layer under the citrulline hit.
Focus stays clean with 550 mg choline bitartrate (226 mg choline), 500 mg L-tyrosine and 100 mg glucuronolactone. Niacin (64 mg NE, 400% NRV) and vitamin B6 (18 mg, 1286% NRV) contribute to the reduction of tiredness and fatigue and to normal energy-yielding metabolism. About 20 servings in the 350 g tub when you run the full 17.5 g label serve.
Mix ~2 scoops with 300–350 ml of water, drink 30–45 minutes before training — then crush the session on pump alone.
Stim-free. Pump-heavy. Sleep stays on the table.
Ideal For
- Evening or late workouts where caffeine is off the table
- Training sessions focused on pumps and high-intensity sets without stims
- Adults who want Skull Crusher pump density without the caffeinated version
How to Use
- Shake the package well before use.
- Mix ~2 scoops of powder (17.5 g) with 300–350 ml of water.
- Drink 1 portion daily 30–45 minutes before workout.
Do not exceed the recommended daily dose (1 portion / 17.5 g). The scoop facilitates portioning but does not guarantee precise dosing — prefer a scale. Product is sold by weight, not volume; some settling may occur.
Ingredients
Active / formula
| Citrulline malate | 6000 mg |
| Beta‑alanine | 3200 mg |
| L‑arginine alpha‑ketoglutarate (A‑AKG) | 1500 mg |
| Betaine | 1000 mg |
| Taurine | 1000 mg |
| Glyceryl monostearate | 1000 mg |
| Choline bitartrate | 550 mg |
| L‑tyrosine | 500 mg |
| Glucuronolactone | 100 mg |
| Niacin | 64 mg NE (400% NRV) |
| Vitamin B6 | 18 mg (1286% NRV) |
Other ingredients
Anti‑caking agent (E551), acidity regulator (E500(ii)), flavourings, salt, red beet juice concentrate, black carrot concentrate, sweeteners (sucralose, acesulfame K, steviol glycosides from Stevia), colours (E160a, E104, E132). Ingredient list names betaine as betaine anhydrous; amount table lists Betaine. Glyceryl monostearate appears as stabiliser on the ingredient list.
Ingredients may vary depending on flavour. Always check the product packaging. Flavours: Lychee, Dragon Fruit, Mango-Lemon, Citrus-Peach, Fruit Massage, Blackberry-Pineapple, Orange-Mango, Exotic, Grape, Sour Watermelon, Blue Raspberry. E104: May have an adverse effect on activity and attention in children.
Supplement Facts
| Citrulline malate | 6000 mg |
|---|---|
| of which citrulline | 4000 mg |
| Beta-alanine | 3200 mg |
| L-arginine alpha-ketoglutarate (A-AKG) | 1500 mg |
| of which L-arginine | 1050 mg |
| Betaine | 1000 mg |
| Taurine | 1000 mg |
| Glyceryl monostearate | 1000 mg |
| Choline bitartrate | 550 mg |
| of which choline | 226 mg |
| L-tyrosine | 500 mg |
| Glucuronolactone | 100 mg |
| Niacin | 64 mg NE (400% NRV) |
| Vitamin B6 | 18 mg (1286% NRV) |
Warnings
Do not use if you are allergic to any of the product compounds. Do not exceed the recommended daily dose. Food supplements should not be used as a substitute for a varied diet. A varied and balanced diet and healthy lifestyle are recommended.
Do not use if pregnant or nursing. Keep out of reach of young children. If you take medications, you should consult your doctor before you consume the product.
The measure included in the packet serves to facilitate portioning, but it does not guarantee precise dosing. It is advisable to use scales in order to measure out the exact amount. Shake the package well before use. This product is sold by weight not volume. Some settling of powder may occur during shipping and handling, which may affect density of powder. This product contains the serving indicated when measured exactly by weight.
Reviews
There are no reviews yet.