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Featured Ingredient

Close-up of Leucidal Liquid on a spoon, a natural preservative ingredient used by The Good Soap Works Co.

Leucidal Liquid

Friendly, Fermented, and Naturally Protective

Say hello to Leucidal® Liquid, the gentle guardian of natural skincare! Derived from Lactobacillus, the same family of bacteria used to ferment kimchi and yogurt, Leucidal® is a fermentation-based preservative that helps keep products fresh and safe—without the use of synthetic or harsh chemicals. It works by inhibiting the growth of bacteria and microbes, extending shelf life while maintaining a clean label and a skin-loving vibe.

Perfect for natural formulations like creams, lotions, toners, and even some water-containing deodorants, Leucidal® offers a mild, non-irritating alternative to traditional preservatives like parabens or phenoxyethanol. It’s especially popular in eco-conscious and sensitive-skin formulations, thanks to its gentle profile. And while it doesn’t offer broad-spectrum protection against all molds and yeasts on its own, it pairs beautifully with other natural boosters like gluconolactone or AMTicide Coconut to create a full-spectrum preservative system.

Though it’s not the most budget-friendly ingredient (due to its fermentation process and specialty use), it’s well worth the investment in water-based products where shelf stability is essential. Customers love seeing it on an ingredient list because it means your formula is not only effective, but also aligned with clean, plant-powered values. Think of Leucidal as your natural skincare’s behind-the-scenes protector—silent, safe, and incredibly effective.

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