The deal adds a fast-growing brand popular with young women to Celsius’s product line as its own growth slows.

The purchase allows Celsius to add a fast-growing beverage popular with young women while better positioning it to compete against rivals Red Bull and Monster.

Celsius Holdings said on Thursday it would buy health and wellness drinks brand Alani Nutrition in a $1.8 billion deal through a combination of cash and stock, boosting its portfolio to build on the growing demand for sports and energy beverages.