We get it, got to test the 'waters'.
Grab a sample pack - usually $24.99
Just $22.49
Performance Without Compromise
FREE GIFT WITH MONTH 2 OF SUBSCRIPTION · 30-DAY MONEY-BACK · FREE SHIP $35+
Trusted by tested athletes & frontline operators
Performance energy.
Without the crash,
the sugar, or the
banned substances.
Underdog Performance Drink delivers 249mg of time-released caffeine (175mg green tea + 74mg di-caffeine malate) plus our cognition + endurance stack — Lion's Mane and Alpha-GPC for focus, L-citrulline for blood flow — engineered for sustained focus over 6–8 hours. Informed Sport Certified. Zero sugar. Crafted in the USA.
- ✓ Free shipping on orders $35+
- ✓ 30-day money-back · no questions asked
- ✓ Informed Sport Certified · safe for tested athletes
Real performance. Real benefits.
Sustained energy
L-citrulline supports blood flow and endurance. Di-caffeine malate keeps you steady for 6–8 hours. No 2pm cliff.
Sharp focus
Lion's Mane + Alpha-GPC for cognition and memory. Green tea's natural L-theanine for calm focus. Locks in within 20 minutes.
Zero crash
Di-caffeine malate releases slowly. Extended-release energy, not a 30-min spike. No shaky hands.
Tested athletes safe
Informed Sport Certified — passes NHL, NFL, MLB, Olympic testing.
Zero sugar
Natural sweeteners — stevia and erythritol. No aspartame, no sucralose, no artificial junk.
Crafted in the USA
Made here. Tested here. We donate cans to first responders & frontline heroes.
THE UNDERDOG CURVE
Exactly how it feels.
Most energy drinks dump 200–300mg of straight caffeine into your system at minute 30, then drop you off a cliff at hour 2. Underdog splits 249mg across two sources — green tea (4–6hr half-life) + di-caffeine malate (8–10hr half-life) — for sustained energy across 6–8 hours, then a clean wind-down.
0–20 min
Open the can
First sip. Green tea caffeine starts absorbing fast. Di-caffeine malate begins its slow-release. Smooth onset, no rush.
20 min – 6 hr
Locked in
Focus and energy at a steady plateau. No spike. Same level at hour 1 as hour 3.
6–8 hr
Clean wind-down
Gradual taper, not a crash. No jitters, no anxiety, no shaky hands. Sleep intact.
WHAT YOU'LL FIND ON THE SHELF
One of these is built different.
WHAT YOU'RE GETTING
UNDERDOG
- 0g sugar
- 249mg caffeine · 2 sources
- Informed Sport Certified
- Lion's Mane + Alpha-GPC + L-citrulline
300mg Spike
- 0g sugar
- 300mg spike · crash at 2hr
- Not banned-substance tested
Lifestyle Stim
- 0g sugar
- 200mg spike · crash at 2hr
- Not banned-substance tested
Clean-Energy Newbie
- 0g sugar
- 200mg caffeine
- Not banned-substance tested
Categories illustrated using publicly available product imagery, blurred to remove brand identification. Not affiliated with any referenced products.
TRUSTED BY
The people we built this for.
"I've never had an energy drink that makes me feel energized and ready to attack a workout that also has prolonged performance benefits. The blue raspberry flavour is also unbeatable in my books."
Jacob Bernard-Docker
Detroit Red Wings · NHL
"Two 300mg-spike drinks a shift, hands shaking by 4am. Switched to Underdog — hands stopped shaking after a week."
Eddie M.
ER nurse · verified buyer
"I compete in a tested federation. Underdog is the first energy drink my coach approved. Tastes great, holds up for 3-hour sessions."
Jess R.
Powerlifter · verified buyer
"We built Underdog because the energy drinks marketed as 'clean' weren't clean enough for the athletes and operators we work with. So we made one that is."
The Underdog founders
Built in the USA
Read the label on 4 cans. Pick the one that isn't lying.
| UNDERDOG | 300mg Spike | Lifestyle Stim | Classic OG | Coffee | |
|---|---|---|---|---|---|
| Informed Sport Certified | ✓ | ✗ | ✗ | ✗ | ✗ |
| Caffeine, 2-source time-release | ✓ 249mg | ✗ (spike) | ✗ (spike) | ✗ (spike) | ✗ |
| Real nootropics (Lion's Mane + Alpha-GPC) | ✓ | ✗ | ✗ | ✗ | ✗ |
| Zero sugar | ✓ | ✓ | ✓ | ✗ (27g) | ✓ |
| Crash profile | None | Hard | Moderate | Mild | Hard |
| Hours of usable energy | 6–8 | 1–2 | 1–2 | 1.5 | 1.5 |
Comparison categories based on publicly available nutrition labels of leading competitor products. Brand names not used. Not affiliated with or endorsed by any referenced products.
What's actually in the can.
Every ingredient named, dosed, and explained. No proprietary blends.
249mg caffeine · 2 sources
175mg green tea74mg Infinergy™6–8hr active
Green tea extract brings fast-onset natural caffeine plus L-theanine for calm focus. Infinergy™ di-caffeine malate is taurine-bonded for slow, sustained release.
250mg Lion's Mane (8:1)
CognitionNeurogenesisMental clarity
250mg of an 8:1 extract — equivalent to 2,000mg of raw mushroom. The functional mushroom shown in research to support cognitive function.
GeniusPure® Alpha-GPC 99%
Choline precursorMemoryFocus
The highest-purity Alpha-GPC available — 99% pure choline precursor. Crosses the blood-brain barrier and supports the acetylcholine system.
4,000mg L-Citrulline
Clinical doseBlood flowEndurance
A full 4g clinical dose — the same amount used in performance research. Supports nitric oxide production and oxygen delivery to working muscles.
Natural sweeteners
Stevia leafErythritol
Stevia leaf extract + erythritol. That's it. No aspartame, no sucralose, no artificial sweeteners that wreck your gut.
Informed Sport Certified
WADA-compliantBatch testedAthlete-safe
The gold-standard certification used by NHL, NFL, MLB, and Olympic athletes. Every batch independently tested for 250+ banned substances.
Every ingredient and mg dose printed on every can.
SAVE MORE WHEN YOU STOCK UP
Buy 2 cases. Save $8.99.
Most subscribers order 2 cases every 30 days. Add a second case now and lock in the bundle price — that's 24 cans for $50.98 instead of $59.98.
Add 2 cases — $50.98Save $8.99 · Free shipping included24
cans of clean performance energy.
One bundle. One delivery.
Real reviews from real switchers.
★★★★★✓ Verified
"Wish I'd switched 3 years ago."
"Was a 2-can-a-day person on a popular lifestyle stim. Anxiety brutal. Switched and my afternoons feel calm and locked in. No crash, no jitters."
★★★★★✓ Verified
"Hands stopped shaking in a week."
"ER nurse, 2 high-stim 300mg drinks a shift. Hands constantly shaking. Switched to Underdog — fixed in 4 days."
★★★★★✓ Verified
"First one my coach approved."
"Tested federation, can't drink most energy drinks. Underdog is the only one I trust. Lasts a full 3-hour session."
★★★★★✓ Verified
"Subscribed after the first case."
"Bought a case to try. Nine days in, ordered the second. Subscribed at week 3. Whole team is on it now."
Questions before you stock up.
How long until I feel a difference?
Most switchers report a noticeably smoother afternoon by day 3 and better sleep within a week.
How much caffeine, and what gives it the smooth feel?
249mg total caffeine: 175mg from green tea extract (natural caffeine + L-theanine) and 74mg from di-caffeine malate (slow-release). Plus Lion's Mane mushroom extract, Alpha-GPC, and L-citrulline for cognition and endurance.
What does Informed Sport Certified mean?
It's the gold-standard banned-substance certification used by NHL, NFL, MLB, NCAA, and Olympic athletes. Every batch independently tested for 250+ substances.
How does the subscription work?
Ships every 30 days. 25% off your first order, 15% off recurring. Skip, swap flavors, or cancel anytime.
What if I don't like it?
30-day money-back guarantee. Drink the whole case if you want. Refund either way.
TRY UNDERDOG RISK-FREE
Drink the case.
Keep the case.
Decide after.
If it's not the best energy drink you've had in 5 years, we refund you. Keep the empties.
Subscribe & Save — $22.4925% off first · 15% off recurring · cancel anytime Or buy once for $29.99 →30
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