Glycerin, also known as glycerol, is a powerhouse ingredient in skincare due to its exceptional humectant properties. As a humectant, glycerin works by attracting water from the environment and deeper layers of the skin to the outer layer (stratum corneum), thereby increasing skin hydration [1]. This hydrating effect is not just superficial; glycerin has been shown to penetrate deep into the skin, providing long-lasting moisture retention.

The effectiveness of glycerin in skincare is backed by numerous scientific studies. Research has shown that glycerin can improve skin barrier function, increase skin hydration, and enhance skin elasticity [2]. A study published in the British Journal of Dermatology found that glycerin was more effective than other humectants, including hyaluronic acid and sorbitol, in increasing skin hydration and reducing transepidermal water loss [3].

Beyond its hydrating properties, glycerin has been found to have protective and healing effects on the skin. It can help shield the skin from irritants and environmental stressors, making it particularly beneficial for sensitive or compromised skin [4]. Additionally, glycerin has been shown to accelerate wound healing processes and improve skin barrier recovery, which is crucial for maintaining healthy, resilient skin [5].