Product | 로맨시브

Korea’s No.1 beverage—selling three bottles every minute.

COZA, The liquid solution for a restful night.

What makes COZA, Korea’s No.1 beverage, different?

No.1 on Naver Shopping • No.1 on Coupang • No.1 on Wadiz

Sanjoin Beverage Keyword Rank (2023.06.07) • Sanjoin Beverage Keyword Rank (2023.06.08) • All-time No.1 Sanjoin Beverage (2022-2023)

The only sleep beverage in Korea with preclinical & clinical research results.

COZA is the only beverage in Korea to have published preclinical and clinical research results in collaboration with Bundang Seoul National University Hospital. As a food product, not a drug, COZA has been clinically proven to be more effective than 3mg of melatonin.

01 2.6x faster sleep onset compared to the control group (3mg melatonin).

02 3.2x better sleep quality compared to the control group (water).

03 No tolerance buildup even with long-term use.

Made with clean, KFDA-approved ingredients.

No alcohol, no cholesterol, no caffeine—only the essential ingredients your body needs. Enjoy COZA with peace of mind, made with a carefully curated clean formula.