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A multi-functional skincare superstar with several proven benefits for the skin Great anti-aging, wrinkle smoothing ingredient used at 4-5% concentration Fades brown spots alone or in combination with amino sugar, acetyl glucosamine Increases ceramide synthesis that results in a stronger, healthier skin barrier and better skin hydration Can help to improve several skin conditions including acne, rosacea, and atopic dermatitis It's a helper ingredient that improves the freeze-thaw stability of products It's also a solvent, humectant and to some extent a penetration enhancer It has a bad reputation among natural cosmetics advocates but cosmetic scientists and toxicology experts do not agree (read more in the geeky details section) Butylene glycol, or lets just call it BG, is a multi-tasking colorless, syrupy liquid