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Fuel your workouts with clean, effective energy.

No artificial colors, flavors, fillers, or sugar.

C o r e

Core⁵ strips pre-workout down to what actually matters: clean, clinically dosed ingredients that deliver smooth energy, locked-in focus, and repeatable performance.
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5 Core Ingredients

Built for athletes who train consistently and demand results they can feel, trust, and sustain.

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C l i n i c a l l y   d o s e d .   P o w e r f u l l y   s i m p l e .

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Clean formula

No artificial colors, flavors, fillers, or sugar.

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5 core ingredients

Simple, intentional, and effective.

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Steady, effective energy

Clean power that supports better workouts.

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Daily-use friendly

Designed for consistent training.

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01

Clean formula

No artificial colors, flavors, fillers, or sugar.

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02

5 core ingredients

Simple, intentional, and effective.

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03

Steady, effective energy

Clean power that supports better workouts.

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04

Daily-use friendly

Designed for consistent training.

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A   f u n c t i o n a l   f o r m u l a   m a d e   f o r   c o n s i s t e n t ,   h i g h e r - p e r f o r m i n g   w o r k o u t s .

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Strength

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Pump

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Endurance

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Hydration

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Energy

M a d e   t o   t h e   h i g h e s t   s t a n d a r d s

Core5 is produced in the USA, manufactured in a GMP-certified facility, and third-party tested to ensure potency, purity, and consistency, with clinically effective dosages in every serving.

C l e a n   e n e r g y ,   d e l i v e r e d   t o   y o u r   d o o r   e v e r y   m o n t h .

Save 5% on every order + free shipping when you subscribe.

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Frequently asked
questions

What does pre-workout do?

Pre-workout supplements are designed to support energy, focus, endurance, and performance during training. Core⁵ uses clinically effective dosages of five core ingredients to deliver these benefits without unnecessary additives.

When should I take pre-workout?

Most people take pre-workout 20–30 minutes before training. This gives the ingredients time to absorb and deliver steady, functional energy.

What makes Core⁵ different from other pre-workouts?

Core⁵ uses ingredients at clinically effective dosages, with no artificial colors, flavors, fillers, or sugar. Designed for clean, steady performance for your workouts.

Will Core⁵ give me jitters or a crash?

Core⁵ is formulated for smooth, controlled energy using clean ingredients and moderate caffeine, avoiding the overstimulated spike-and-crash effect of typical pre-workouts.

Is Core⁵ safe for daily use?

Yes. Core⁵ uses a simple, intentional formula without harsh stimulants, making it suitable for consistent, daily training.

How should I take Core⁵ for best results?

Mix one scoop with 8–12 oz of water and drink 20–30 minutes before training. New users can start with a half scoop to assess tolerance. Use daily for best results.

Does Core⁵ use clinically effective dosages?

Yes. Each ingredient is included at clinically effective or clinically supported dosages to ensure real performance benefits.

Can beginners use Core⁵?

Yes. Core⁵’s simple, clean formula works well for both beginners and experienced athletes. Beginners may start with a half scoop.

What results should I expect from Core⁵?

Core⁵ supports steady energy, focus, endurance, and more consistent performance without the typical crash.

How is Core⁵ made and tested?

Core⁵ is manufactured in a GMP-certified facility and independently tested by a third-party to verify quality, purity, and consistency.

Recent news & articles

Introducing Core⁵: How and Why We Built Our First Pre-Workout
Launching a sports nutrition brand today means entering a space crowded with noise. Shelves and websites are filled with products promising extreme energy, massive pumps, and instant results, often backed by long ingredient lists and aggressive stimulation. RZN Nutrition was built to...
Why Pre-Workout Can Improve Training Performance and Strength
Strength gains are not accidental. They are the result of repeated exposure to high-quality training sessions that challenge the body to adapt over time. While many factors influence strength development—including programming, nutrition, recovery, and consistency—the quality of each individual training session plays...
What “Clinically Effective” Actually Means — and Why Most Supplements Miss the Mark
In sports nutrition, few phrases are used more frequently—and more loosely—than clinically effective. It appears on labels, product pages, and advertisements, often without explanation or accountability. For many consumers, the term has become background noise. In reality, clinically effective has a precise meaning...