Optimise VO₂ Max, Sustain Power & Recover Faster"

Stamox Oxy-plus Competition beetroot extract powder for endurance, VO2 max, and power, anti-doping tested

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More Oxygen. Less Effort.

Stamox Oxy-Plus — Beetroot Powder Formulated in Norway

4.9

4000+ ATHLETE REVIEWS

$49.00 USD

Lowers the O₂ cost of hard efforts in 2–3 hours. Backed by decades of research. Trusted by Olympians since 2007.

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12-Week Guarantee: Measurable results, or your money back.

What Stamox Does For You

Athlete wearing VO2 Master mask during intense endurance training for performance and recovery

Breathe Easier

3–5% lower O₂ cost at the same pace. More oxygen to muscle. Same effort, less strain — from the very first dose.

Two cyclists in aerodynamic gear riding coastal road at sunset, promoting endurance and performance

Hold Pace Longer

Extends time-to-exhaustion by up to 16%. Hold threshold wattage when others fade.

Athlete on track with beetroot powder supplement for endurance and recovery

Recover Faster

Betalains clear metabolic waste and reduce inflammation. Less soreness. Fresher legs. No GI distress.

Trusted By The Best

Athlete in sportswear leaning on bridge railing, promoting natural endurance and recovery

Sustained Wattage, Late-Stage Power

"Multiple new PBs since I started Stamox. More explosive power. Sustained energy to finish strong."

- Rolf Solheimdal Johansen, Multiple World Champion in Triathlon & Undefeated Norwegian Champion in Winter Triathlon

Sophie Souwer

x2 World Champion, x2 Olympian, x3 European Champion

"Lactate Threshold jumped from 82% to 88% – I can push harder for longer with Stamox."

Thomas Elholm

x2 Gold National Champion Rower

"VO₂ max from 72.1 to 76.6 in 4 months. A jump that big is highly unlikely through training alone."

Mathis Desloges

x3 Silver Medals at the 2026 Winter Olympics

"Stamox has been a cornerstone of my Olympic preparation."

Maicol Petta

AG Ironman Champion

"My heart rate is 5 to 6 bpm lower at the same pace with Stamox. Same intensity, less strain."

Jente Michels

x2 European Champion, Alpecin‑Deceuninck Cyclist

“The purest beetroot powder on the market. Boosted my power and VO₂ max - helping me become U23 European Champion”

ATHLETE DATA // USER METRICS

Elite Performance Data

-8 BPM

LOWER THRESHOLD HEART RATE

ARVID J. NORDIC CYCLIST CHAMP

+4.5

VO₂ MAX INCREASE (4 MO)

THOMAS E. X2 NATIONAL ROWER CHAMP

+2.6%

POWER OUTPUT JUMP

JACK B. ULTRA DISTANCE RECORD HOLDER

See 4000+ Athlete Reviews →

Athlete sprinting on track, showcasing power and endurance for peak performance

Backed by Research. Proven in Competition.

IOC Level A

The highest evidence tier in sport. One of only five supplements — alongside caffeine and creatine.

AIS Group A

Australia's top classification. Awarded only when the science is clear.

180+ Human Trials

Performance data across cycling, running, rowing, and team sports.

19 Years R&D

Refined since 2007. Anti-doping tested.

Developed in Norway. Refined over 19 years.

Smiling older man with glasses, Utrecht University and FH OÖ logos, outdoors

Dr. Nils Reither

Dr. Nils Reither, DVM — Veterinarian · Utrecht, 1990 · 36 years in industry

In 2007, Dr. Reither created the foundational Stamox matrix. Since then, it has been validated by 19 years of elite use, ongoing R&D with the University of Applied Sciences Upper Austria, and independent anti‑doping testing.

From Norway, for human performance.

Read Our Story →

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2026 Collection

Local Fulfilment

Orders ship locally from our warehouses in the EU, UK, and Norway. No customs. Tracked delivery.

Performance Guarantee

Follow our 12‑Week Protocol: Measurable HR drop or time‑to‑exhaustion improvement — or your money back.

Personal Protocol Support

Race or protocol question? We help you dial it in. Email us at eirin@stamox.com.

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Optimise VO₂ Max, Sustain Power & Recover Faster