Lactic acid isn’t just waste your body needs to flush out. It’s mostly lactate, an energy source your body can burn or recycle — the burn you feel late in a race comes from your muscles producing it faster than they can process it, not from lactate itself being toxic.
Every endurance athlete knows the feeling. You’re at the 30km mark of a marathon, or the final leg of a triathlon, and your legs start to feel heavy — like they’re filled with lead. For decades that burning sensation got blamed on one culprit: lactic acid.
Lactic acid isn’t the enemy
Older sports science treated lactic acid as a toxic by-product to flush out. That view has shifted — lactate is a genuine energy source. The problem isn’t that your body produces it; it’s that during hard, sustained effort it can produce it faster than it clears it. When that backlog builds, hydrogen ions accumulate, muscle pH drops, and you get that familiar burn.
Where Katsuo Stamina fits
Katsuo Stamina is built from Migratory Fish Extract, specifically a peptide containing Anserine and Carnosine, derived from katsuo (bonito) — a fish that swims long distances without stopping. These are studied for buffering hydrogen ions in muscle, which is the working theory behind stabilising pH and delaying the burn during sustained effort.
It’s aimed at that mechanism specifically — not at masking fatigue the way a stimulant does. No caffeine, no sugar.
How to use it in a race
- Pre-race: 4 tablets 30 minutes before the start.
- During the race: 4 tablets every 90–120 minutes, per the label.
It’s a peptide supplement aimed at lactate buffering and recovery — not a hydration product, and not a substitute for getting your carbs, fluids and pacing right first.