A Pre-Workout Built for Performance. and Your Health.

Take control of every session with Stim-Pre-Pump — fully dosed, transparent, and engineered to perform without wrecking your long-term health.

Shop Stim-Pre-Pump

One Product. One Formula. Zero Filler.

Rein Nutrition makes one thing, and we make it right. Stim-Pre-Pump is a high-stim, fully dosed pre-workout for athletes who want explosive pumps, locked-in focus, and real endurance — without proprietary blends or a brutal crash.

Buy Now — $59.99

Dosed With Purpose

Three hero ingredients only — at a glance. The full breakdown lives on the Ingredients page so you're not repeating the whole label here.

Black circular object with a thick gold border.
10 g of L-citrulline per scoop in Rein Nutrition Stim Pre-Pump

L-CITRULLINE

2–3x the typical pre-workout dose for bigger pumps and better blood flow.

circle 2 4 g of beta-alanine per scoop in Rein Nutrition Stim Pre-Pump
Black circle with a gold border, labeled as 'Black Circle'.

BETA-ALANINE

More reps, less fatigue — clinically backed dosing that keeps you going.

220 mg of caffeine per scoop in Rein Nutrition Stim Pre-Pump
Black circle with a gold border.

CAFFEINE

+ L-Tyrosine Laser focus and tunnel vision, no jitters, no crash.

See The Formula
Lifter carrying a weight plate across the gym floor during a training session

Health Shouldn't Be the Price of Performance

Most pre-workouts are built on hype and cheap, under-dosed fillers. Rein was built on the opposite belief — that what you take to perform should also support your health, recovery, and the long game. We don't cut corners and we don't chase trends.

Our Story

Built for the Way You Train

  • Vasodilation that actually shows up by your second set.

  • Clean, tunnel-vision energy that lasts the whole session.

  • Push more volume without gassing out early.

  • Layered energy that lets you down easy instead of dropping you.

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
Rein Nutrition founder Chase Gloeckner in a front double biceps pose on the bodybuilding stage

Rein was founded by coach Chase Gloeckner, who got tired of choosing between products that worked and products that were safe to take every day. Stim-Pre-Pump is the standard he wanted and couldn't find.

Made by Someone Who Actually Trains

Meet Chase

Common Questions

  • 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

Take Control of Your Next Session

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