# Best Lye for Soap Making Source: https://soapmakingnest.com/best/best-lye-for-soap-making Updated: 2026-09-15 Publisher: Soap Making Nest. Our score is an editorial rating out of 10 (fit 35%, features 25%, build 20%, value 20%), not a customer rating. Method: https://soapmakingnest.com/how-we-research#our-score Lye is the alkali that turns oils into soap through saponification, and it is essential for cold process and hot process bars. Home soap makers rely on sodium hydroxide for solid bars and potassium hydroxide for liquid soap, so choosing the right type matters. Quality lye means consistent, predictable batches and safer handling. When comparing products, look for high purity, typically 99 percent or greater, moisture-resistant packaging that keeps flakes or beads dry, clear labeling of the hydroxide type, resealable containers, and reputable suppliers with proper safety documentation. This guide compares lye options that stay fresh, dissolve cleanly, and give you the reliable results every from-scratch soap recipe depends on. ## Picks ### 1. The Boyer Lye for Soap Making, Sodium Hydroxide Food Grade, 2 Pack 2.2 lbs Our score: 9.1/10 (Fit for the job 10/10 · Features and specs 8/10 · Build and materials 9/10 · Value 9/10) The Boyer food grade sodium hydroxide in a 2 Pack of 2.2 lbs containers, for frequent cold process soap makers. Pros: - 2 Pack means a sealed spare stays dry until the first tub is used - Same trusted Boyer food grade lye as the single container - Buying two at once cuts down on reorders for busy soaping seasons Cons: - More lye than an occasional maker needs, and it must be stored safely - Both containers need cool, dry, locked storage away from children Details: https://soapmakingnest.com/product/B09M7P6PCQ ### 2. The Boyer Corporation Lye for Soap Making, Sodium Hydroxide Food Grade, 2.2 lbs Our score: 8.9/10 (Fit for the job 10/10 · Features and specs 8/10 · Build and materials 9/10 · Value 8/10) The Boyer Corporation 2.2 lbs food grade sodium hydroxide, a trusted lye for home cold process soap makers. Pros: - Boyer lye is a long-established name among cold process soap makers - Food grade purity helps saponification behave as recipes predict - 2.2 lbs is enough for plenty of batches from a single container Cons: - Lye absorbs moisture from air, so reseal the container right after use - Needs full safety gear and a careful routine every single time Details: https://soapmakingnest.com/product/B09LZ7SN9T ### 3. Miilex Food Grade Lye Sodium Hydroxide, 100% Pure Caustic Soda, Kosher, 2lbs Our score: 8.4/10 (Fit for the job 9/10 · Features and specs 8/10 · Build and materials 8/10 · Value 8/10) Miilex 2lbs kosher food grade sodium hydroxide, 100% pure caustic soda for cold process and liquid soap recipes. Pros: - 100% pure caustic soda labeling supports accurate lye calculations - Kosher and food grade claims suit makers with strict ingredient standards - 2lbs is a sensible supply for regular hobby soap making Cons: - Less known than Boyer, so community feedback on it is thinner - Must be stored airtight and away from kids, pets and moisture Details: https://soapmakingnest.com/product/B0CWL155PV ### 4. Lye for Soap Making, Sodium Hydroxide, Pure Food Grade Caustic Soda, 2 lbs Our score: 7.6/10 (Fit for the job 8/10 · Features and specs 7/10 · Build and materials 7/10 · Value 8/10) A 2 lbs tub of pure food grade sodium hydroxide lye for cold process and hot process bar soap making. Pros: - Food grade sodium hydroxide keeps impurities low for predictable batches - 2 lbs covers many small batches of cold process bar soap - Pure lye means lye calculators give accurate results with this product Cons: - Sold in small 2 lb bags, so frequent soap makers will need to restock often - Caustic chemical, so gloves, goggles and ventilation are essential Details: https://soapmakingnest.com/product/B08FK7J42B ### 5. ComStar Pure Lye, 99% Sodium Hydroxide Beads & Flakes, Pack of 2, 1 lb Our score: 7.6/10 (Fit for the job 8/10 · Features and specs 7/10 · Build and materials 7/10 · Value 8/10) ComStar 99% pure sodium hydroxide beads and flakes, Pack of 2, 1 lb each, for small-batch cold process soap. Pros: - 99% purity is suitable for accurate cold process lye calculations - Pack of 2 smaller containers limits moisture exposure once opened - Beads and flakes dissolve readily when added slowly to cold water Cons: - Mixed beads and flakes can weigh less evenly than uniform beads - Newer brand without the long soap-making history of Boyer Details: https://soapmakingnest.com/product/B0GYQGR9FB ### 6. DIYChemicals Sodium Hydroxide (Lye), Pure NaOH, Industrial Grade, 40lbs Our score: 6.9/10 (Fit for the job 6/10 · Features and specs 7/10 · Build and materials 7/10 · Value 8/10) DIYChemicals 40lbs industrial grade pure NaOH, a bulk lye supply more suited to high-volume or technical users. Pros: - 40lbs bulk supply is hard to beat for large-volume soap production - Pure NaOH works with standard lye calculators and soap recipes - Bulk buying reduces packaging waste versus many small tubs Cons: - Industrial grade rather than food grade, so purity may be less assured - Huge quantity is risky to store and far beyond most home soapers Details: https://soapmakingnest.com/product/B0DKP8BLQG ### 7. Food Grade Lye Sodium Hydroxide, 100% Pure Caustic Soda Granules, 1lb Our score: 6.9/10 (Fit for the job 8/10 · Features and specs 6/10 · Build and materials 6/10 · Value 7/10) A 1lb container of food grade 100% pure caustic soda granules, a small lye supply for first cold process batches. Pros: - 1lb size is a low-commitment amount for learning cold process soap - Granules pour and weigh easily on a digital scale - Food grade purity helps beginner recipes turn out as expected Cons: - Sold in a small 1lb bag, so frequent soap makers will need to restock often - Small container runs out fast once you start making soap regularly Details: https://soapmakingnest.com/product/B0DH7DS842 As an Amazon Associate I earn from qualifying purchases.