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Stim-Pre-Pump
$59.99
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A person performing a plank exercise on the floor in a gym, with their arms and legs extended, wearing workout clothes.

Train Without Compromise

Stim-Pre-Pump is everything a pre-workout should be and nothing it shouldn't. Ten grams of L-Citrulline for skin-splitting pumps, a clean 220mg caffeine kick for tunnel-vision focus, and a fully disclosed 12-ingredient formula dosed to actually perform. No fairy dust, no crash — just the standard you've been looking for.

A woman in athletic clothing and gloves exercises on a rooftop gym, doing a plank with one arm on a battle rope, with city buildings in the background.

What You'll Feel

  • 10g citrulline + agmatine for blood flow that shows up by your second set.

  • Caffeine, tyrosine, and mucuna for clean, dialed energy and drive.

  • Beta-alanine and betaine to push more volume before fatigue sets in.

  • Theobromine smooths the curve so you come down easy, not hard.

Fully Dosed. Fully Disclosed.

10g citrulline, 4g beta-alanine, 3g betaine, 220mg caffeine

See every ingredient and dose

How to Use

One scoop, 12–16 oz water, ~20 min pre-workout. New to high-stim? Start with a half scoop.

Why Rein

Built by coach Chase Gloeckner, the pre-workout he wanted for his own athletes.

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Reviews

5 stars by 100+ customers

"The best pre-workout I’ve ever used! Would recommend to anyone"

— Glen Keating

"Awesome taste, great pump and perfect stim balance! Plus you can’t beat the amount you get for the price! Highly recommend"

— ScarbroughKM

“It actually gets me going, gets my focus and attention stimulated & make my workouts more productive”

— Richard DeBerry

FAQ

  • 220mg — strong but not reckless, balanced with theobromine and tyrosine for a smooth ride.

  • Yes. It's formulated for daily training, not just occasional use.

  • Mixed Berry, mixes clean with no grit.

See All FAqs