"A practical supplier guide to Lauryl Betaine (CAS 683-10-3, C16H33NO2, EINECS 211-669-5): the zwitterionic surfactant supplied as a yellow liquid that makes cleansing systems milder, foams more stable, and finished products feel softer after the rinse. Covers its pH-dependent charge, mild cleansing, foam boosting, conditioning and antistatic behavior, and typical use in shampoos, body washes, facial and baby cleansers, dishwashing, and textile auxiliaries. Includes pairing notes with Sodium Lauroylsarcosinate, N-oleoylsarcosine, Sarcosine, Ethylhexylglycerin, Squalane, and brightening/exfoliating actives."
-Deshangchemical-chemechemi
Lauryl Betaine (CAS 683-10-3): The Zwitterionic Surfactant That Quiets the Whole Cleansing System
If you have spent any time building shampoos, body washes, or facial cleansers, you have probably reached for cocamidopropyl betaine by habit. It works, and most formulators know it cold. Lauryl betaine — often listed as dodecyl betaine, CAS 683-10-3 — is the shorter-chain cousin that does much of the same job with a simpler structure and a few behaviors worth understanding before you specify it.
On our product page the basics read like this: molecular formula C16H33NO2, EINECS 211-669-5, supplied as a yellow liquid. It is a zwitterionic (amphoteric) surfactant, and that single property drives almost everything useful about it.
What "zwitterionic" actually means in the bottle
A zwitterion carries both a positive and a negative charge in the same molecule, and the balance shifts with pH. At low pH lauryl betaine leans cationic; at high pH it leans anionic; around neutral it sits close to balanced. For the formulator this matters because it stays compatible with nearly every other surfactant class you might pair it with — anionics like sulfates, cationics like quats, and nonionics alike. You rarely see the precipitation or cloudiness that shows up when two incompatible surfactants are forced together.
That compatibility is the reason lauryl betaine turns up in systems where a single misstep would otherwise cloud the batch. It is also why it is a safe pick in concentrates and in products that will drift across a wide pH range during their shelf life.
What it does once it is in the formula
Three things, mostly. First, mild cleansing. On its own lauryl betaine washes skin and hair without the tightness you get from a straight sulfate. Second, foam. It boosts and stabilizes lather, and it keeps foam from collapsing when the formula meets hard water or oily skin. Third, conditioning and antistatic behavior — the positively charged side of the molecule lays down on hair and skin, which is why rinse-off products feel softer after they are rinsed away.
A fourth, quieter benefit is mildness buffering. When you blend lauryl betaine with a harsher primary surfactant, the overall irritation load drops. That is the whole reason for using it in baby care and in facial cleansers, where the margin for sting is small.
Where buyers actually put it
Personal care is the main destination: shampoos, 2-in-1 conditioners, body washes, facial cleansers, and baby products. Beyond that it appears in dishwashing liquids and hard-surface cleaners, where the antistatic and grease-emulsifying behavior helps, and in textile and dyeing auxiliaries as a wetting and antistatic agent.
Use levels sit roughly in the 1–10% range for most rinse-off systems, with the low end for facial and baby products and the high end where you want foam and viscosity without adding more sulfate. As always, settle the exact level with a small-batch test rather than by the number on a datasheet.
Pairing it with the rest of the bench
Lauryl betaine rarely works alone, and the combinations are where the value shows. With a mild amino-acid surfactant such as Sodium Lauroylsarcosinate (CAS 137-16-6) or N-oleoylsarcosine (CAS 110-25-8), you get a fully sulfate-free system that still foams and still cleans. Sarcosine (CAS 107-97-1) is the building block behind both, and worth a look if you are sourcing the family together.
For preservation, Ethylhexylglycerin (CAS 70445-33-9) is a natural companion — a preservative booster and skin-conditioning agent that sits well in the same mild, rinse-off space. On the emollient side, Squalane (CAS 111-01-3) brings the after-feel that betaine only hints at.
If the product carries active ingredients, lauryl betaine is a neutral host. It pairs with brightening and antioxidant actives such as Kojic acid (CAS 501-30-4), Alpha-Arbutin (CAS 84380-01-8), and L-Ascorbic Acid (CAS 50-81-7), and with exfoliating acids like Glycolic acid (CAS 79-14-1) and Salicylic acid (CAS 69-72-7). Citric Acid Anhydrous (CAS 77-92-9) handles pH adjustment, and Urea (CAS 57-13-6) adds the humectant and skin-conditioning note that rounds out a wash-off formula.
Handling and spec notes
Lauryl betaine ships as a yellow liquid and is typically supplied at a set active content; confirm the assay on the batch COA, because the active percentage changes your use-level math. Store it in a cool, dry place away from strong oxidizers, and keep containers sealed — like most betaines it is water-based and will pick up contamination if left open.
Color can run from pale to yellow depending on grade and batch, which is normal and not a quality flag. If your finished product is clear and colorless, run a small compatibility check first; most of the time it blends without tint, but very clear gels can pick up a faint hue at high loadings.
Why specify it from a single source
When you buy lauryl betaine together with the sarcosinates, the preservative booster, and the emollients above, you consolidate documents, batches, and logistics. We test every batch before it leaves, and we can supply the Commercial Invoice, Packing List, Bill of Loading, COA, and certificates your market asks for. If your formulation has a specific pH window or a tight color requirement, tell us early and we will match the grade to it.
Lauryl betaine will not win any awards for novelty. It is a workhorse zwitterion that makes harsh systems gentler, foams more stable, and finished products feel better after the rinse. For most rinse-off formulations that is exactly what you need, and it is why we keep it in stock and ready to ship.
