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4.9 · 11,200 ATHLETES

Pre-workout. Intra-workout. The same tub. Caffeine + creatine + electrolytes — and nothing you can't pronounce.

HIT YOUR NEXT SESSION HARDER.

HERO · tub spotlight · 4:4.5
$59$47
IN STOCK · SHIPS IN 24H
Backed by
Men's Health GQ Runner's World ESPN Bicycling
No fairy dust. No proprietary blends.

HIT YOUR DAILY PERFORMANCE FLOOR WITHOUT THE FAIRY DUST.

Every ingredient is dosed at the clinical-effective amount. The label is one column, all-caps, milligrams up front.

What it does

WHAT WILL IT DO FOR ME?

More reps before failure
Creatine + beta-alanine = ~2 extra reps at the same load by week 3.
Faster recovery between sets
Citrulline 6g delivers measurable blood-flow improvements at 20 mins.
Clean focus, no jitters
L-theanine smooths 200mg caffeine — feels like a flat-line, not a cliff.
No 4 pm crash
Designed for an AM session that doesn't kill the rest of your day.
Four reasons

WHY HALCYON ENGINE.

01

EVERY MG ON THE FRONT.

No proprietary blends. You see what you're paying for. The label is one column, no marketing — milligrams, source, and form.

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02

FORMULATED BY TWO PHDs.

One exercise physiologist, one biochemist. They publish the formula every quarter. If we change a milligram, you'll know.

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03

WORKS AS A PRE OR INTRA.

One scoop, 15 mins before. Or sip across the session. Same dose, different timing strategy — your call.

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04

BATCH-TESTED EVERY TIME.

Informed Sport certified. Every lot tested for banned substances. Tested for heavy metals. Tested for actual potency. Posted online.

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FULL BLEED · powder swirl
The formula

200mg caffeine. 6g citrulline. 4g creatine.

Every active dosed to the clinical-effective amount. The kind of label you'd expect from a lab and a coach — not from a marketing team.

200mg
Caffeine anhydrous
6g
L-citrulline malate
4g
Creatine monohydrate
3.2g
Beta-alanine
2g
L-tyrosine
200mg
L-theanine
SAVE 20%

ENGINE v3

$59$47
4.9 · 11,200 ATHLETES

30 servings per tub. 200mg caffeine. 6g citrulline. 4g creatine. Informed Sport certified. Choose your flavor.

Citrus
Berry
Unflavored
Single tub
30 servings · one-time
$59
MOST CHOSEN
Subscribe · save 20%
Ships every 30 days
$47$59
Stack · 3 tubs
90 servings · lock the price
$129$177
✓ FREE SHIP ✓ 60-DAY TRIAL ✓ SKIP ANYTIME
Eight active ingredients

EVERY MILLIGRAM ON THE FRONT.

No proprietary blends. No vanity ingredients at 1mg "for the label." Just the formula, dosed clinically.

Caffeine

Anhydrous
200mg

L-Citrulline

Malate 2:1
6g

Creatine

Monohydrate
4g

Beta-Alanine

Carnosyn®
3.2g

L-Theanine

Smooths caffeine
200mg

Electrolytes

Na · K · Mg
1.2g
Engine vs. the rest

READ THE BACK OF THE TUB.

SPEC
ENGINE
"PRE V2"
Doses on front, in mg
Creatine included
4g
0g
Caffeine
200mg
400mg
Sweetener
Stevia
Sucralose
Banned-substance tested
Cost per scoop
$1.57
$1.20
After 21 days

THE NUMBERS, VERIFIED.

Independent panel · n = 312 · 2025

+18%
Reps to failure, week 3
+12%
Peak power output (Wingate)
94%
Reported "smooth, no crash"
0
Banned substances detected
The protocol

ONE SCOOP. 15 MINUTES BEFORE.

Or sip across the session. Same dose. Pick the timing strategy that suits the lift.

shake
01

SCOOP & SHAKE

One scoop in 12 oz of cold water. Shake 5 seconds. No clumps.

wait
02

WAIT 15 MINUTES

Tingle on the cheeks is the beta-alanine. That's how you know it's working.

train
03

TRAIN

Pump. Power. Focus. No crash by 4pm. Repeat tomorrow.

11,200 athletes

WHAT THEY'RE SAYING.

★★★★★

"Hit a 30lb PR on my back squat at week 4. Don't feel tweaky after. That's the part nobody talks about."

MARCUS H.Verified · 11 weeks
★★★★★

"I'm 42. I sleep at 9pm. This is the first pre I can take at 5am without paying for it that night."

DEVON L.Verified · 4 months
★★★★★

"Coach started me on this for my marathon block. Day 60: 3 minute PR on the long-run pace."

SARAH K.Verified · 9 months

FROM THE COMMUNITY.

SEE ALL →
@MARCUS.LIFTS
@DEVON.RUNS
@SARAHKIN
@HOMECLUB
60-DAY TRIAL
Empty the tub. Refund if it didn't.
BANNED-SAFE
Informed Sport tested · every lot
DOC-FORMULATED
Two PhDs · published online
SKIP ANYTIME
No phone. From your dashboard.
Athlete FAQ

QUESTIONS, ANSWERED.

IS THIS BANNED-SUBSTANCE TESTED?

+
Yes. Every lot is Informed Sport tested. We publish the certificate online with the lot number printed on the tub. If you're tested, this is the only pre-workout class we're aware of with no flagged ingredients.

DO I NEED TO CYCLE OFF?

+
Caffeine: take 1-2 days off per week to prevent tolerance. Creatine: doesn't require cycling. Beta-alanine: doesn't require cycling. The formula is built so you can take it indefinitely with a couple of off days.

WHY 200MG CAFFEINE INSTEAD OF 400?

+
Above 200mg, the curve flattens. You get more side-effects and not more performance. Plus 200mg + 200mg L-theanine smooths the response — no jitters, no afternoon crash.

WHAT ABOUT THE TINGLES?

+
That's beta-alanine. It's harmless paresthesia — nerves on the skin firing. Goes away in 20 minutes. The dose is clinically effective at 3.2g.

CAN I STACK IT WITH OTHER SUPPLEMENTS?

+
It's designed to be standalone — but works fine alongside whey, fish oil and basic multivits. Avoid other caffeine sources within 4 hours and don't double-dose the creatine.

HOW DOES SUBSCRIPTION WORK?

+
One tub every 30 days by default. Skip, swap flavor, or cancel from your dashboard. We send a heads-up 4 days before each shipment.
ENGINE v3 · CITRUS
★ 4.9·$47 / month