Frequently Asked Questions
Everything you need to know about Stim-Pre-Pump, ordering, and getting the most out of every scoop.
The Product
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It's a high-stim pre-workout — 220mg of caffeine per serving, paired with tyrosine and theobromine for clean, focused energy. Strong enough for serious training, balanced so you get drive and focus without the jitters or a hard crash.
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Stim-Pre-Pump comes in Mixed Berry. It mixes clean and smooth in water with no grit.
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Yes. Stim-Pre-Pump is formulated for daily training use. As with any caffeinated product, just keep your total daily caffeine intake from all sources in mind.
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Take Stim-Pre-Pump about 20 minutes before your workout for the best results.
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Mix one scoop with 12–16 oz of water and drink it roughly 20 minutes before training. Adjust water to taste.
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No. Every ingredient and its exact dose is listed right on the label. No proprietary blends, no hidden "fairy dust" — full transparency on what you're putting in your body.
Safety & Suitability
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Stim-Pre-Pump is made with transparently dosed, research-backed ingredients. That said, products by Rein Nutrition are not evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease. Always consult your doctor before use.
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Yes — Stim-Pre-Pump pairs well with supplements like protein and creatine. Because it already contains 220mg of caffeine, be mindful of additional stimulants or caffeine from other sources, and consult your doctor if you're unsure.
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Stim-Pre-Pump is a high-stimulant product. It is not recommended for anyone under 18, women who are pregnant or nursing, or those sensitive to caffeine or with known heart conditions. If you have a medical condition or take medication, consult your doctor before use.
Orders & Shipping
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Unopened supplements in original, sealed condition can be returned within 7 days of delivery. For safety and quality reasons, opened supplements can't be returned or refunded. See our Shipping & Returns page for full details.
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Yes — Stim-Pre-Pump pairs well with supplements like protein and creatine. Because it already contains 220mg of caffeine, be mindful of additional stimulants or caffeine from other sources, and consult your doctor if you're unsure.
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Yes. If you'd like to carry Rein in your gym, studio, or store, visit our Wholesale page to apply.