Learn why glycerin can perform beautifully in one environment and disappoint in another. As a humectant, glycerin’s primary job is to move moisture from the more humid area to the drier area.
The Dew Point Factor
In moderate humidity, glycerin pulls moisture from the air into your hair, keeping it hydrated. However, in extremely dry air, it can actually pull moisture OUT of your hair and into the atmosphere, causing dryness. Conversely, in very high humidity, it may pull too much water in, causing the hair shaft to swell and frizz. Understanding your local weather is the secret to mastering glycerin.