buying guide · comparison ·

Category5 vs Sledgehammer: Which Muscleology Pre-Workout Is Right for You?

Category5 vs Sledgehammer — Muscleology pre-workouts

By the Muscleology Editorial Team | July 21, 2026

If you've landed here, you've already narrowed it down to the two pre-workouts we actually stand behind: Sledgehammer and Category5. Good. Now you just need to know which one belongs in your gym bag.

Here's the short version before we get into the weeds. Sledgehammer is our full-stim, high-energy pre-workout built around 400mg of caffeine and a serious pump matrix. Category5 is our stim-free formula with a full 5g of creatine monohydrate, made for people who train late, already run on coffee, or just don't want a stimulant hit before every session. They solve two different problems, and plenty of people end up using both.

Let's break down exactly who each one is for so you're not guessing.

The 30-second summary

Choose Sledgehammer if you want a strong energy-and-pump kick for high-intensity training, early sessions, or the days you show up flat and need to flip the switch.
Choose Category5 if you want creatine built into your pre-workout, you train in the evening, you're sensitive to caffeine, or you already drink coffee and don't need more stimulants.
Choose both if you want creatine every day (Category5) and a stim boost only on your hardest training days (Sledgehammer). More on stacking below.

Both are made the Muscleology way: honest, fully disclosed labels with no proprietary blends and no amino spiking, produced in a cGMP facility, and backed by our Taste-It-First guarantee. We've been a family-run shop in Davie, Florida since 2003, and we don't put anything on the label we wouldn't take ourselves.

Side-by-side comparison

Spec	Sledgehammer	Category5
Type	Full-stim pre-workout	Stim-free pre-workout
Caffeine	400mg total (300mg anhydrous + 100mg di-caffeine malate/Infinergy)	0mg — completely stim-free
Beta-alanine	1,600mg	Not included
Pump ingredients	1,000mg L-arginine, 500mg agmatine sulfate	Not the focus — built around creatine
Creatine	None	5g creatine monohydrate (full clinical dose)
Focus / other actives	500mg Alpha-GPC, 200mg green tea extract, 5mg piperine	—
Flavor	Fruit Crush / Pineapple	StrawBurst
Best for	High-intensity training, morning/pre-day sessions, strong energy + pump	Evening training, caffeine-sensitive lifters, coffee drinkers, creatine users
Price	$39.99	$44.99

Sledgehammer, in plain English

Sledgehammer is the one you reach for when you want to feel it kick in. The 400mg caffeine total comes from two sources on purpose: 300mg of fast-acting caffeine anhydrous for the upfront hit, plus 100mg of Infinergy (di-caffeine malate) that tends to feel a little smoother and longer than anhydrous alone. That's a strong dose, so we'll say it plainly: if you're caffeine-sensitive, if it's late in the day, or if you've already had a couple of coffees, this is probably not your move. Start with half a scoop to assess tolerance.

Beyond the energy, Sledgehammer is loaded for the working set. You get 1,600mg of beta-alanine (yes, that's the ingredient behind the familiar tingle), 1,000mg of L-arginine and 500mg of agmatine sulfate on the pump side, plus 500mg of Alpha-GPC for focus and 200mg of green tea extract. The 5mg of piperine is there to support absorption. It comes in Fruit Crush and Pineapple, both of which pass the Taste-It-First test.

One thing Sledgehammer does not have: creatine. That's a deliberate design choice, not an oversight. Which brings us to the other side of the shelf.

Category5, in plain English

Category5 is our stim-free pre-workout, and its headline is simple: a full 5g dose of creatine monohydrate in every serving. No caffeine, no beta-alanine, no stimulant load at all. StrawBurst flavor.

Why build a pre-workout with zero stimulants? Because a huge number of lifters don't actually need more caffeine before they train. Maybe you train at 8pm and want to sleep afterward. Maybe caffeine makes you jittery or wrecks your rest. Maybe you already have a coffee (or two) on the way to the gym and adding 400mg on top is overkill. And creatine is one of the most well-studied ingredients in the entire supplement world, so having your daily 5g land right around your workout is a convenient, no-nonsense way to stay consistent with it.

Category5 is also the more flexible of the two when it comes to stacking, precisely because it doesn't bring any stimulants of its own to the table. It plays nicely with coffee, and it plays nicely with Sledgehammer.

Not sure what fits your goal? Find your stack in 60 seconds →

Can you stack them? Yes — here's how

This is the question we get most, so let's be direct: Category5 and Sledgehammer are designed to work together, not against each other. They don't share ingredients, which means stacking them doesn't double up on anything or push your caffeine higher than Sledgehammer already delivers on its own.

A couple of sensible approaches:

The training-day stack. Take Category5 every day for your consistent 5g of creatine, and add Sledgehammer only on your hard training days when you want the extra energy and pump. This is the most popular route for people who want creatine daily but don't want stimulants daily.
The alternating approach. Use Sledgehammer for morning or high-intensity sessions and Category5 for evening or lighter sessions. You get energy when you want it and a clean, stim-free option when you don't.
Category5 plus coffee. If you like your caffeine to come from your morning cup, run Category5 for the creatine and let the coffee handle the energy. No need for Sledgehammer at all in this setup.

The point is that "which one" isn't always an either/or. For a lot of lifters, the real answer is "both, at different times."

So which should you actually buy?

Choose Sledgehammer if:

You train early or want a strong pre-day energy boost.
You do high-intensity work and want the beta-alanine plus arginine and agmatine pump package.
You want focus support from Alpha-GPC.
You are not caffeine-sensitive and aren't training right before bed.
You already have a separate creatine source (or take it elsewhere in your day).

Choose Category5 if:

You want creatine built right into your pre-workout at a full 5g.
You train in the evening and don't want caffeine keeping you up.
You're sensitive to stimulants, or you already get your caffeine from coffee.
You want a formula you can stack with Sledgehammer or coffee without doubling up.

Choose both if you want creatine every day and a stim boost on the days you go hard.

Want to go deeper on the ingredients themselves? Our pre-workout ingredient guide walks through what each component does and why the dose matters, and our guide on what to look for in a stim-free pre-workout is a great companion read if Category5 is calling your name. You can also see everything side by side in our full pre-workout collection.

However you decide, remember Subscribe & Save takes 10% off and ships free, and Taste-It-First means you're not stuck with a flavor you don't love.

Frequently Asked Questions

Can I take Category5 and Sledgehammer together?

Yes. They're built to be stacked because they don't share ingredients. A common approach is Category5 daily for the 5g creatine and Sledgehammer added only on your hard training days for the energy and pump. Stacking them doesn't raise your caffeine beyond what Sledgehammer already provides on its own.

Which one has creatine?

Category5 has creatine — a full 5g dose of creatine monohydrate per serving. Sledgehammer does not contain creatine; it's built around energy, focus, and pump ingredients instead. If you want creatine in your pre-workout, Category5 is your pick.

Which one is stronger?

If by "stronger" you mean stimulant energy, that's Sledgehammer, with 400mg of total caffeine plus beta-alanine, a pump matrix, and Alpha-GPC. Category5 is stim-free by design, so it won't give you that caffeine kick at all. "Stronger" really depends on whether you're after energy or after built-in creatine.

Is Sledgehammer too much caffeine for me?

At 400mg total, Sledgehammer is a strong dose. If you're caffeine-sensitive, training late in the day, or already drinking coffee, it may be more than you want. Start with half a scoop to assess tolerance, and if stimulants aren't for you, Category5 is the stim-free alternative.

Which is better for evening or late-night workouts?

Category5. Because it's completely stim-free, it won't interfere with winding down after a late session. Sledgehammer's 400mg of caffeine is better suited to morning or daytime training when a stimulant boost fits your schedule.

What do they taste like and how much do they cost?

Sledgehammer comes in Fruit Crush and Pineapple at $39.99. Category5 comes in StrawBurst at $44.99. Both are covered by our Taste-It-First guarantee, and Subscribe & Save takes 10% off with free shipping on either one.