Core⁵ Pre-Workout
Pre-workout, stripped to what works. 5 core ingredients, all clinically dosed and named on the label. 5g Creatine, 6g L-Citrulline Malate, 3.5g Beta-Alanine, 857mg Electrolyte Complex, 200mg Caffeine. No artificial colors, flavors, fillers, or sugar.
Core⁵ Pre-Workout
- 5g creatine to support strength and power output by helping regenerate ATP during high-intensity training.
- 6g l-citrulline malate 2:1 to promote blood flow and pump by increasing nitric oxide availability and supporting sustained performance.
- 3.5g beta-alanine to buffer lactic acid buildup and improve endurance, helping maintain higher training intensity.
- 857mg electrolyte complex provides magnesium, chloride, sodium, and potassium to support hydration, fluid balance, and muscle function.
- 200mg natural caffeine to deliver clean, steady workout energy and improved focus without unnecessary stimulant blends.
Other Ingredients: Silicon Dioxide (anti-caking), Natural Flavors, Stevia Leaf Extract (SureSweet-SL™), Beet Root Powder (for color), Calcium Silicate (anti-caking)
Mix 1 scoop with 8-12 oz of water and consume 20 - 30 minutes before training. New users: begin with ½ scoop to assess tolerance. Do not exceed 2 scoops per day. Use daily for best results.
Orders are processed within 1–2 business days (Monday–Friday). During high-demand periods, processing may take slightly longer. Shipping options and delivery estimates are shown at checkout. Because our products are consumable supplements, we accept returns within 30 days of delivery on unopened, untampered items only. Opened or used products are not eligible for return.
If your order arrives damaged or defective, contact us within 7 days of delivery with photos and your order number—we’ll make it right.
Original shipping costs are non-refundable. Return shipping fees may be deducted from your refund if a prepaid label is provided.
Questions? Reach us anytime at support@rznnutrition.com.
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Strength
Pump
Endurance
Hydration
Energy
The Breakdown
Strength
Creatine Monohydrate
5g
More strength.
Helps your muscles produce power so you can train harder, lift heavier, and build long-term progress.
Pump
Citrulline Malate 2:1
6g
Better pumps.
Supports blood flow so your muscles feel fuller and your working sets feel better.
Endurance
Beta-Alanine
3.5g
More reps.
Helps you keep pushing when your muscles start to burn during hard sets.
Hydration
Electrolyte Complex
857mg
Better hydration.
Supports hydration and muscle function while you train, sweat, and push hard. Includes potassium 200mg, magnesium 60mg, sodium 240mg, and chloride 357mg.
Energy
Natural Caffeine
200mg
Clean energy.
Gives you energy and focus without turning your pre-workout into a stim bomb.
Why Choose Core⁵
// A true all-in-one pre-workout.
Creatine, electrolytes, and a full pump and endurance stack in one scoop. No buying three products to cover one workout. Everything you need is already in here.
// 5 ingredients beats 20 every time.
More ingredients doesn't mean more results. Core⁵ strips pre-workout to the 5 core ingredients backed by the most research — each at a full clinical dose.
// Scalable to your training.
At 200mg of caffeine, one scoop is dialed in for daily training. Going for a PR? Take up to two scoops for extra strength, pump, and endurance without an overload of stimulants. You control the intensity.
The Comparison
Other Pre-Workouts vs CORE⁵
More ingredients doesn’t make a better pre-workout. CORE⁵ keeps it to the five that actually matter before training.
| What matters | Other Pre-Workouts | CORE⁵ |
|---|---|---|
| Clinical dosing | ✕Often underdosed | ✓Clinically dosed core ingredients |
| Creatine included | ✕Often sold separately | ✓Built in, 5g |
| Electrolytes for hydration | ✕Rarely a formula focus | ✓857mg electrolytes for hydration |
| Caffeine | ✕Often 300mg+ or stim-heavy | ✓200mg clean energy |
| Ingredient count | ✕Often 15 to 20+ ingredients | ✓5 core ingredients |
| Clean formula | ✕Often artificial colors, flavors, or sweeteners | ✓No artificial colors, flavors, or sweeteners |
| Built for daily use | ✕Often built for max-stim sessions | ✓Built for consistent training |
Comparison reflects common pre-workout category trends. Individual formulas vary. Always review each product label before purchase.
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It started in college. Every pre-workout I tried was either 20+ ingredients and overloaded with caffeine, or "clean" but too underdosed to do anything. None of it hit right.
So I did the research myself. I found the ingredients that actually matter in the gym and picked one for each thing that counts. Creatine for strength. Citrulline for pump. Beta-alanine for endurance. Electrolytes for hydration. Caffeine for energy.
I ordered raw powder by the kilo and measured out single servings on my kitchen counter, dialing it in workout after workout until it was right. Five core ingredients, and it hit harder than any store-bought pre I'd ever used.
CORE⁵ is that formula.
— Andrew
Founder, RZN Nutrition
Frequently asked
questions
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.
Awesome product, no crash with great pumps! Simple ingredients with creatine added makes this an all around pre workout. 🏋️
The best pre workout I’ve tried! Taste, energy, pump, no crash, and I definitely appreciate the creatine included! The itchy tingles aren’t bad. I'll be subscribing for my orders.
The formula of this product is top notch. The pre is fully dosed with no proprietary blends. It provides a nice stimulant to get you going and offers sustainable energy throughout your workout. I just wish they had more flavors (:
Fantastic flavor. Love the ingredients
Great pre workout! Has everything you need for a great lift, reduces muscle fatigue and gives you the right amount of energy.
I am very picky about clean ingredients, so when I saw this clean pre-workout I definitely had to give it a try!
I was nervous that it being clean would mean it wouldn’t work as well, but it has been fantastic!
It has definitely help push me through my morning grogginess and aided immensely in upping my workout intensity!
I’m hooked! The flavor is great as well!
Really loving this product! I really like how it pumps me up. I was noticing just this morning how much my veins were popping in my arms. It gives me that great itch, too, which I love. Lol. Definitely will be purchasing more.
Great communication! Quick shipping. Very communicative. Love it so far! Gives me the boost I need. Can’t wait to see the results of taking it consistently.
Core5 pre workout is awesome. I love how it has creatine and electrolytes included. The biggest difference I feel is my workouts are significantly longer, I can go for 60+ minutes now without feeling fatigued. The taste is great too, love how no artificial flavors or dyes are used.
Core5 is the real deal! Great pumps and energy in the gym, and shipping was fast. It’s refreshing to see a product that cuts out ineffective ingredients and properly doses the ones that actually matter.
Tried RZN pre-workout and it hit exactly how you want it to. Clean energy, locked-in focus, and no crash. I walked into the gym ready to move serious weight and stayed dialed in the entire session. Pumps were solid, strength felt up, and every set just clicked. Definitely one of those supplements that actually elevates your workout instead of just hyping you up.
RZN Pre-workout is a game changer for my active routine and lifestyle. It allowed me to level up my workouts in the gym and even use it for cycling to keep me fresh and energized. Being in the AZ heat, I really appreciate the electrolyte blend, offering more hydration than a liquid IV.
The generous dose of L-Citrulline and beta alanine are the top ingredients that provide the maximum boosts in nitric oxide and blood flow and allow me to push to my limits. Caffeine is dosed perfectly to allow for 1.5 or 2x scoop for big days. Huge bonus having a creatine stack in there as well.
Overall a 10/10 product that offers an amazing bang for your buck.
I tried CORE5 because I loved the minimal, transparent, and clean approach.
I just started a new workout program and haven’t really used pre-workout before, so I didn’t want anything overwhelming to start with.
What stood out right away was the creatine and electrolytes. I usually rely on sports drinks for that, so having it already built in was a win. The taste was great, the energy was smooth and lasted my entire workout, and I never felt overstimulated.
The label is actually really cool. The main ingredients are front and center with icons explaining exactly what each one does.
Already recommending it to friends.
Great Pre Workout!
I am enjoying the product. It’s not gritty when mixed well. Would love to see more flavor options!
It makes me feel insane and it’s great it has creatine in it too, but it tastes soooooo bad I’ve never tasted something that made me wanna throw up more than this in my life
Great product! I like how simple the ingredients are and it genuinely does have a good stick throughout an entire hour to 2 hour workout. I will definitely be repurchasing
Great product for a daily use. For folks that dont like high stim products this is perfect. Does a great job of delivering energy without the crash!
Solid product. Great taste and good performance. Enough of a kick from 200mg of caffeine to get me going and no jitters. Tried taking later in the day and had no issue going to sleep on time. 10/10 recommend.
Got the chance to try CORE5 pre-workout and I genuinely loved it. Ive been looking for a pre-workout with cleaner, more straightforward ingredients, and this is the one.
The energy was smooth, I felt focused and ready to train, and I never felt overstimulated or jittery. I also really like how simple the formula is. No crazy list of ingredients just to make the label look impressive. Definitely found a new go-to pre-workout.
I love the natural taste of this preworkout and the simple ingredients! No artificial dyes or flavors is HUGE for a preworkout. It’s helping me get into the mode for my workouts too. It checks all the boxes for me!
Love the flavor! It's not super sweet. Has a little tang which I love. I feel energized and a bit unstoppable during my workout 10/10 recommend. Love the minimal ingredients.
Great taste. Great energy. Clean ingredients. Great company. Looking forward to more flavors!
Taste great and definitely gives a nice steady wave of energy. No crash. I like how it combines 5 of the ingridients for a great workout into 1 easy to use powder that taste good!
Not too bad taste and goes down smooth. No crazy spike in energy but keeps you up and moving and never tapers off. Definitely purchasing again
Quick delivery, 1 scoop the taste is neutral but 2 scoops hits perfectly! Good clean ingredients.
