Endurance athletes know that performance isn’t just about training—it’s about how the body manages fatigue, muscle damage, and recovery. Katsuo Stamina is the first Japanese-engineered supplement to combine clinical validation with real-world race results, offering athletes a measurable edge.
Race-Backed Performance Data
Dr. Takeshi Oomichi, a Japanese sports physician and marathoner, demonstrated the impact of Katsuo Stamina across multiple events:
| Event | Before Katsuo Stamina | With Katsuo Stamina |
| Senshu Marathon | 3:27:15 | 3:21:19 |
| Tokyo Marathon | — | 3:20:06 |
| Half Marathon (case 1) | 1:41:15 | 1:40:04 |
| Half Marathon (case 2) | 1:41:00 | 1:39:06 |
Key highlight: Both marathons were run with negative splits, a gold standard of endurance pacing.
Biochemical Evidence: Muscle Protection
The science behind Katsuo Stamina lies in its ability to reduce muscle damage markers:
- Creatine Phosphokinase (CPK), a key enzyme released when muscle fibers are damaged, dropped significantly:
- Without Katsuo Stamina: ~1000 IU/L
- With Katsuo Stamina: ~600 IU/L
This ~40% reduction indicates less muscle trauma, faster recovery, and the ability to sustain higher training loads.
Mechanism of Action
Katsuo Stamina’s core ingredient is Migratory Fish Extract, a peptide composed of β-alanine and methylhistidine. Together, they:
- Buffer lactic acid → delaying fatigue during long efforts.
- Protect muscle fibers → reducing micro-tears and soreness.
- Accelerate recovery → enabling consistent training blocks.
Nutritional profile (per 4 tablets, 1.6 g):
- Energy: 6.29 kcal
- Protein: 0.49 g
- Carbohydrates: 1.06 mg
- Sodium: 0.006 mg
Industry Credibility
- Dual certification: Katsuo Stamina is Asia’s first endurance supplement to pass Informed-Sport and Informed-Choice non-doping certifications.
- Adoption trend: Endurance coaches and sports physicians are increasingly recommending functional supplements to bridge the gap between training and recovery.
Why It Matters
For athletes chasing PRs, podiums, or simply more durable training, Katsuo Stamina offers dual validation:
- Race outcomes (negative splits, faster times)
- Medical data (lower CPK, reduced muscle damage)
This isn’t marketing hype—it’s measurable science applied to endurance performance.
Katsuo Stamina is not just a supplement; it’s a performance system that combines clinical safety, biochemical efficacy, and proven race-day results.