Mos Burger partners with VALX for limited protein shake launch

Mos Food Services is launching a limited-time collaboration between Mos Burger and the fitness brand VALX. Starting October 1, 2026, the “Mixable VALX Shake – Blueberry Yogurt Flavor” will be available at 385 Mos Burger locations across Tokyo, Kanagawa, Chiba, and Saitama.

Supervised by body makeup trainer Yoshinori Yamamoto, the shake contains 13g of VALX protein powder and is designed to offer a refreshing blueberry yogurt taste. Each 330g serving provides 12.6g of protein. The product will be sold until early November or until supplies run out.

To celebrate the launch, a promotional campaign will offer prizes via receipt uploads on X (formerly Twitter). Prizes include a custom “Yamamoto-sensei Muscle Cushion” shaped like the trainer's arm and voice-enabled alarm clocks. All participants in the campaign will receive digital voice data from Yamamoto.