Skincare that makes sense. See what's really in your products — in plain English.

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For informational purposes only — not medical advice. Always consult a dermatologist for skin concerns.

Lye

1% line markerAI-analyzed

INCI: SODIUM HYDROXIDE (SOAP-MAKING AGENT)

pH adjustersaponifying agentdenaturant

What it does

Sodium Hydroxide is a strong alkali commonly used in cosmetics to adjust pH or as a saponifying agent in soap making. It is typically present in finished products in trace amounts or as a reacted ingredient.

Skin Concerns

No specific concern data available

Safety & Science

Safety summary

Highly corrosive in concentrated form. In finished cosmetic products, it is generally present in very low concentrations or has reacted to form other compounds, making it safe for use.

1% line marker

This ingredient is commonly used as a marker to identify where ingredients drop below 1% concentration on the label.

Found In Products

Related Ingredients

At a Glance

INCI Name: SODIUM HYDROXIDE (SOAP-MAKING AGENT)
Common Name: Lye
Functions: pH adjuster, saponifying agent, denaturant
Products: 3 products

For informational purposes only. This is not medical advice. Always patch test new products and consult a dermatologist for skin concerns.

Lye — Skincare Ingredient Guide — Dermasift — Dermasift