The global propylene glycol market is segmented by source, into petroleum-based and bio-based propylene glycol. The market for bio-based propylene glycol is expected to grow at the highest CAGR from 2019 to 2024. This is because the production of propylene glycol from the bio-based source has less impact on the environment. In addition, increasing demand from the pharmaceuticals, food & beverage, and cosmetics applications is also driving the growth of the bio-based propylene glycol market.