Every training session breaks muscle tissue down. That's the point. The adaptation that makes you faster, stronger, and more resilient happens during the repair that follows. But repair requires raw material: amino acids, delivered in the right amounts, in the right window. Without adequate protein after exercise, the breakdown signal your body sent during training doesn't get answered, and the adaptation stalls.

SiS REGO Whey Protein delivers 22g of whey protein concentrate per 30g serving - including 2.8g of L-leucine, all nine essential amino acids, and Vitamins B1, B2, and B6 - in a low-carb formula built specifically for shorter, high-intensity sessions.

Whey Because It Works – Whey is the fastest-digesting complete protein available. When you consume it within the 30–60 minute recovery window after exercise, your muscles absorb amino acids rapidly — stopping the breakdown process and triggering the repair and rebuilding signals your body needs to adapt to training. The 2.8g of L-leucine per serving is particularly meaningful: leucine is the specific amino acid that acts as the "on switch" for muscle protein synthesis, the process of actually building new muscle tissue.

Low Carb by Design – With roughly 2g of carbohydrate per serving, REGO Whey is built for sessions where glycogen depletion isn't the main issue — the kind of training where you're pushing intensity but not duration. This keeps the caloric intake low (~117 kcal per serving) while delivering a full protein hit. If you're coming off a long ride or a multi-hour run, the SiS REGO Rapid Recovery with its full carb-protein ratio is the better call. For everything else, this is your everyday shake.

Informed Sport Certified – Like every SiS product, REGO Whey is independently tested through the Informed Sport program for all compounds on the WADA Banned Substances List. Three flavors — Chocolate, Strawberry, and Vanilla — and mixes clean with water in under a minute.

How to Use SiS REGO Whey Protein

Post-Workout: Add one 30g scoop to 300ml of cold water and shake. Consume within 30–60 minutes after exercise — this is the window when muscle protein synthesis is most responsive to protein intake.

Anytime Protein: Works equally well as a between-meal protein source on high-training days when daily protein targets are hard to hit from food alone.

Stop over-complicating your workout recovery. This is clean, tested whey protein from a brand built for endurance — nothing more, nothing less.

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