PARIS—L'Oreal is rolling out organic skincare treatments at its Garnier brand as it looks to lift sales in its sluggish mass market unit, tapping a growing demand for more naturally-sourced products that is upending industries from cosmetics to food.
The French beauty firm has been investing like peers in bio-friendly ointments to make headway in a fast-growing niche still dominated by small, specialized companies that got a headstart on larger rivals.
