Pre-Stack InGuz - High Stimulant Preworkout Supplement

$ 49.99

Customer Reviews

Based on 230 reviews Write a review

Collections: Best Sellers, SUPPLEMENTS, SUPPLEMENTS, TOP SELLERS

Fully disclosed · Gummy Bear

A loaded, fully transparent pre-workout for lifters who already know their tolerance. 6 g of L-Citrulline for the pump, a full nootropic focus stack, and a hard-hitting stimulant blend — every gram printed on the panel, no proprietary blends.

L-Citrulline

1.6g

Stimulants

2.8g

Nootropics

Proprietary Blends

What's in the scoop

One scoop, three jobs done right

Built around three levers that actually move a session — blood flow, focus, and energy — dosed to do the job instead of just showing up on the label.

Pumps & endurance

A clinical-level 6 g of L-Citrulline drives nitric-oxide production for fuller pumps and better oxygen delivery, backed by 2.5 g Betaine for strength and power output and L-Ornithine to blunt fatigue.

Locked-in focus

A genuine nootropic layer — Choline Bitartrate, Alpha-GPC, and L-Tyrosine for mind-muscle connection and drive, with Huperzine A and PEA for sharp, sustained mental clarity under load.

High-output energy

350 mg caffeine anhydrous for the hit, smoothed by 300 mg theobromine for a longer curve, with Synephrine and Eria Jarensis adding thermogenic drive. A serious stimulant load — respect it.

Nothing hidden

Read the panel

This is the whole formula, dose for dose. If a pre-workout won't show you this, ask why.

Supplement Facts

Serving Size1 Scoop (~19 g)

Servings Per Container20

Amount Per Serving% DV*

L-Citrulline	6,000 mg †
Betaine Anhydrous	2,500 mg †
Choline Bitartrate	1,400 mg †
L-Ornithine	1,200 mg †
L-Tyrosine	750 mg †
Alpha-GPC (50%, yields 300 mg)	600 mg †
Phenylethylamine (PEA)	400 mg †
Caffeine Anhydrous	350 mg †
Theobromine (20%)	300 mg †
Eria Jarensis Extract	300 mg †
Dendrobium Extract (flower, 10:1)	100 mg †
Synephrine HCL	90 mg †
AstraGin® (Panax notoginseng & Astragalus)	26 mg †
Huperzia serrata (1% Huperzine A)	20 mg †

* Percent Daily Values are based on a 2,000 calorie diet.

† Daily Value not established.

Full disclosure isn't a feature. It's the point.

Every active is named and dosed. No "energy matrix," no "focus complex," no numbers folded into a blend so you can't see what you're actually taking. You read the panel, you know exactly what you're putting in your body — and exactly how strong it is.

This is a high-stimulant formula built for experienced pre-workout users. It is not a beginner product and is not meant to be combined with other stimulants. See dosing and warnings below.

Other ingredients: Natural & artificial flavors, citric acid, malic acid, silicon dioxide, sucralose, acesulfame potassium, FD&C colors.

Dial it in

How to use it

Start low, find your scoop, and never chase it with more caffeine on top.

Step 01 · Assess

Start with a half scoop

First time on Pre-Stack InGuz, run a half scoop to gauge how you respond to the stimulant load before going full.

Step 02 · Mix

1 scoop in 8–12 oz water

Stir into cold water 20–30 minutes before training. Adjust water to taste — more water, smoother sip.

Step 03 · Time it

Train, don't stack

One serving in 24 hours. Do not combine with energy drinks, coffee, or other pre-workouts, and don't take within 6 hours of bed.

Before you buy

Common questions

How much caffeine is in Pre-Stack InGuz? +

One serving contains 350 mg of caffeine anhydrous — roughly three and a half cups of coffee — plus 300 mg theobromine and 90 mg synephrine for a longer, thermogenic energy curve. This is a high-stimulant formula intended for experienced users only.

Can I stack it with an energy drink or another pre-workout? +

No. Pre-Stack InGuz already carries a heavy stimulant load. Do not combine it with energy drinks, coffee, other pre-workouts, or fat burners. Assess your tolerance with a half scoop first and keep to one serving in 24 hours.

Does it use a proprietary blend? +

Never. Every active ingredient and its exact dose is printed on the panel. That's the whole Fitness Stacks standard — you see what you take.

When and how should I take it? +

Mix one scoop into 8–12 oz of cold water and drink 20–30 minutes before training. First time, start with a half scoop. Don't take within 6 hours of bedtime.

What flavor is it, and how many servings per tub? +

Gummy Bear, 20 servings per container.

Is it third-party tested? +

Yes. Every batch is manufactured in a cGMP facility (21 CFR Part 111) and sent to an independent, ISO-accredited lab to confirm each active hits label claim.

⚠️ High-Stimulant Warning — Read Before Use

This product is intended for healthy adults 18 and over who are accustomed to high-stimulant pre-workouts. Each serving contains 350 mg of caffeine plus additional stimulants.

Do not exceed one serving in any 24-hour period. Do not combine with other sources of caffeine or stimulants, including coffee, energy drinks, other pre-workouts, or fat burners.

Not for use by anyone under 18, pregnant or nursing, or by individuals with — or at risk of — high blood pressure, a heart condition, or any other medical condition, or those taking medication (including MAOIs or stimulants). Consult a physician before use, especially if you are sensitive to stimulants. Discontinue and seek medical attention if you experience rapid heartbeat, chest pain, dizziness, or severe headache. Keep out of reach of children.