Propylene glycol is another ingredient that you won't find in blue duckling products. It is a form of mineral oil, which means that it is a petroleum product. Propylene glycol is one of several cheap, low-quality, petroleum-derived things that you'll find in a ton of cosmetics. It is typically used in cosmetics because of its moisturizing and humescent (draws moisture from the air) properties.
Propylene glycol is a major ingredient in automotive anti-freeze and airplane de-icer. Because of its moisturizing properties, it is used in many cosmetics, from lotions to soaps to hand sanitizer to toothpaste. It is a major component of most deodorants and a whole host of other cosmetic and non-cosmetic products.
We don't use propylene glycol because there are far better-quality ingredients that can be used as moisturizers. Rather than gunk up our skin with a variation on mineral oil (which just clogs pores and doesn't have much real beneficial effect), we use things like shea butter and sweet almond oil.
Avoiding propylene glycol has the added benefit of avoiding support of the petroleum industry, which is another blue duckling goal.
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