A recent commentary by AVN Pleasure Products Editor Kim Airs addresses the long-standing debate surrounding glycerin in personal lubricants, asserting that scientific evidence refutes common misconceptions about its role in yeast infections. This perspective challenges a widely held belief within the adult industry that glycerin, often mistaken for a sugar, contributes to or exacerbates such infections.

Glycerin: Sugar Alcohol, Not Sugar

Kim Airs, an AVN Hall of Fame member with over three decades of experience in the adult industry, stated on September 8, 2026, that glycerin is not a sugar but a sugar alcohol. This distinction is central to her argument against the belief that glycerin in lubricants causes yeast infections. Airs noted that for over 15 years, she had advocated avoiding glycerin in lubricants due to the misconception that it was a sugar.

Glycerin, also known as glycerol, is described as a simple polyol compound. It is a colorless, odorless, viscous liquid that tastes sweet and has low toxicity. It is a humectant, meaning it draws water from the air and deeper skin layers to the outer skin layer. This property helps reduce friction and creates a slippery feel, acting as a cushion for sensitive areas. Glycerin's chemical makeup is similar to both sugar and alcohol, but it does not contain the components of sugar that actively feed yeast or other bacteria.

The body can convert digested glycerin into glucose in the liver. However, Airs emphasizes that this conversion does not occur in the vagina because the liver is not connected to the vagina. Yeast requires sugar, such as glucose, to thrive, not an alcohol like glycerin. Therefore, glycerin-based lubricants applied topically will not undergo the metabolization process that would convert them into sugar, which is often falsely blamed for recurring yeast infections.

Challenging Common Misconceptions

Airs highlighted that many people believe glycerin, a common ingredient in lubricants, can cause or worsen yeast infections. This belief stems from the idea that yeast feeds on sugar, and glycerin is mistakenly identified as a sugar. However, glycerin is a sugar alcohol and does not stimulate insulin secretion. The bacteria responsible for yeast infections do not feed on sugar alcohol.

Some sources, however, present a contrasting view. Justin Perlman, in an article medically reviewed by OB-GYN Kerry-Anne Perkins-Gordon, states that while glycerin is not technically a sugar, it can serve as a food source for Candida albicans, the fungi commonly responsible for vaginal or anal yeast infections. This perspective suggests that glycerin should generally be avoided in lubricants because it can cause issues such as yeast infections, genital irritation, and an increased risk of STIs. Perlman's article also notes that glycerin, as a humectant, can raise the osmolality of a personal lubricant, potentially increasing the risk of irritation and subsequent infection. It is also suggested that glycerin can damage the mucus membranes of the genitals or anus, which could increase the risk of infections or STI transmission.

Conversely, Airs points to "blast panels," laboratory tests where molecules like glycerin are inoculated with bacteria and yeast. These tests often show that glycerin and glycerin-based lubes have an almost anti-microbial effect on yeast. Airs notes that glycerin must be bonded to several other molecules to become a complete sugar capable of feeding yeast, which occurs during digestion but not when introduced into the vagina. Furthermore, many over-the-counter and homeopathic yeast infection remedies contain glycerin as an inactive ingredient to ensure the medicine is evenly dispersed within the vagina, suggesting it does not cause yeast infections.

Factors Contributing to Yeast Infections

Airs also detailed other common causes of vaginal yeast infections, which are caused by Candida albicans. These fungi are typically present in small amounts as part of a woman’s vaginal makeup. Factors that can lead to an overgrowth of yeast include changes in the vaginal environment, injury (potentially from insufficient lubrication), sexual transmission, HIV, douching, certain types of underwear, diet, drugs, birth control pills, or other hormonal imbalances. For example, antibiotics can kill beneficial bacteria in the vagina that normally maintain the balance between bacteria and yeast, allowing yeast to proliferate.

Airs advises against wearing satin underwear, recommending cotton for better breathability to keep the vaginal environment balanced. She also cautions against deodorant soaps and commercially available douches, as they can disrupt natural moisture and bacteria. The natural vaginal scent, she states, should be appreciated rather than masked by scented products.

Key Facts

  • Kim Airs, AVN Pleasure Products Editor, states glycerin is a sugar alcohol, not a sugar.
  • Glycerin does not feed yeast or bacteria in the vagina.
  • Digested glycerin can convert to glucose in the liver, but this process does not occur topically in the vagina.
  • Some sources suggest glycerin can be a food source for Candida albicans and may increase irritation and STI risk.
  • Glycerin is an inactive ingredient in some over-the-counter yeast infection remedies.
  • Vaginal yeast infections are caused by Candida albicans, with causes including injury, antibiotics, and hormonal imbalances.