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Behentrimonium Methosulfate (BTMS-50)
ORY® product lines:
☑ Skincare (limited: conditioning lotions, hair-removal aftercare, cream cleansers)
☑ Haircare (hero conditioning emulsifier)
◐ Handmade Soap (conditioner bars; not soap)
☑ Cosmetics (limited: mascaras, brow gels, cream products) — dual-use functional ingredient
Behentrimonium methosulfate (BTMS) is a plant-derived cationic (positively charged) conditioning emulsifier made from rapeseed (canola) oil — the gold standard for hair conditioners. Because damaged hair carries a negative charge, BTMS’s positive charge draws it to the cuticle, where it deposits a thin, substantive film that detangles, reduces friction and breakage, tames frizz, and adds softness and shine [1]. Unlike older quaternary conditioners it is a “methosulfate” (not a sulfate) and is notably mild, non-irritating to skin and scalp, and biodegradable; the Cosmetic Ingredient Review Panel has assessed trimonium compounds and found them safe as used [2]. BTMS-50 is supplied as pellets with cetyl alcohol and butylene glycol, forming a complete, self-thickening conditioner base — and it also emulsifies lotions, giving ORY® a single ingredient for conditioners, conditioner bars, detangling lotions, and creamy cosmetics.
What is Behentrimonium Methosulfate (BTMS-50) made of?
BTMS is produced by reacting behenyl (C22) dimethylamine from rapeseed oil with dimethyl sulfate, then blending with cetyl or cetearyl alcohol. Points to know [2]:
- Behentrimonium methosulfate (~50% in BTMS-50): C22 quaternary ammonium cationic conditioner; the methosulfate counter-ion is not a “sulfate” surfactant.
- Cetyl alcohol (~40–45%): Fatty-alcohol body and co-emulsifier.
- Butylene glycol (~5–10%): Humectant processing aid.
- Cationic and self-emulsifying: Builds conditioners and lotions alone; incompatible with anionic ingredients (SLGC, glyceryl stearate SE) and some anionic thickeners.
- Rapeseed-derived, palm-free, readily biodegradable; melts at ~55–60 °C.
What skin type is best suited for Behentrimonium Methosulfate (BTMS-50)?
BTMS is primarily a haircare ingredient, but its mildness allows conditioning skincare uses:
- Dry: Silky detangling body lotions and cream cleansers.
- Normal: Soft-feel lotions (BTMS as emulsifier).
- Sensitive: Mild cationic; post-shave/wax conditioning lotions; patch test.
- Mature: Cushioning lotions with slip.
- Combination: Light conditioning lotions.
- Oily: Not a primary choice for the face; body use only.
- Acne-prone: Avoid on the face; fine for body and hair.
What hair type is best suited for Behentrimonium Methosulfate (BTMS-50)?
BTMS is ORY®‘s hero conditioning emulsifier for every hair type:
- Dry or damaged: The core use — deposits on damaged cuticle to detangle, reduce breakage, and soften [1].
- Curly and coily: Slip for detangling; defines and moisturizes without heavy oils.
- Color-treated or chemically processed: Smooths raised cuticles; reduces friction and fading.
- Straight and wavy: Light conditioners and leave-ins at low levels for softness without weight.
- Mature or thinning: Lightweight conditioning that adds body without buildup.
- Sensitive scalp: Mild cationic; well tolerated in rinse-off.
- Oily scalp and dandruff-prone: Apply to lengths; rinse-off use; combine with scalp actives in separate steps.
What are the benefits of Behentrimonium Methosulfate (BTMS-50)?
BTMS’s benefits are documented in hair-cosmetic science and safety review [1, 2, 3]:
- Conditioning and detangling: Cationic deposition reduces combing force and breakage [1].
- Frizz control and shine: Smooths the cuticle.
- Softness: Substantive, non-greasy film.
- Emulsification: Builds conditioners and lotions alone (self-thickening with its fatty alcohol).
- Mildness: Low irritation; suitable for leave-in use and sensitive scalps [2].
- Heat and mechanical protection: Reduces friction damage from brushing and heat styling.
- Biodegradable, plant-derived: Rapeseed; palm-free.
- Solid-bar capability: The base of conditioner bars.
Dual use across ORY® product lines
BTMS is a haircare hero with secondary skincare and cosmetics roles; in the soap line it makes conditioner bars but plays no part in soap itself.
Pros and cons of Behentrimonium Methosulfate (BTMS-50)
Pros
Cons
- Gold-standard conditioning: [1].
- Mild, biodegradable, plant-derived: Unlike older quats.
- Self-emulsifying and thickening: Complete conditioner base.
- Leave-in safe: Versatile.
- CIR-reviewed: [2].
- Anionic incompatibility: Cannot combine with anionic surfactants or emulsifiers; separate shampoo and conditioner.
- Buildup on fine hair: Use low levels; clarify periodically.
- “Sulfate” name confusion: Methosulfate is not a sulfate surfactant — label education.
- Not for cold-process soap: Conditioner bars only.
- Cost: Higher than fatty alcohols alone.
What is the best application of Behentrimonium Methosulfate (BTMS-50)?
BTMS is the base of ORY® conditioning products:
- Rinse-off conditioner: 4–6% BTMS-50 with 2% cetearyl alcohol and oils; leave 2–3 minutes.
- Deep mask: 6–8% with butters; 10–20 minutes weekly.
- Leave-in or detangler: 1–3%.
- Curl cream: 3–5%.
- Conditioner bar: 25–40% with cetearyl alcohol, butters, and oils.
- Silky body lotion: 3–4% as emulsifier.
- Cosmetics: Mascara/brow-gel base.
Peer-reviewed references
- Gavazzoni Dias MFR. Hair cosmetics: an overview. International Journal of Trichology. 2015;7(1):2–15.
- Johnson W Jr, Bergfeld WF, Belsito DV, et al. Safety assessment of trimoniums as used in cosmetics. International Journal of Toxicology. 2012;31(6 Suppl):296S–341S.
- Ananthapadmanabhan KP, Moore DJ, Subramanyan K, Misra M, Meyer F. Cleansing without compromise: the impact of cleansers on the skin barrier and the technology of mild cleansing. Dermatologic Therapy. 2004;17(Suppl 1):16–25.
Disclaimer:
The information on this page is provided by ORY International, LC for educational purposes only. It summarizes published research about behentrimonium methosulfate (BTMS-50) as an ingredient, including laboratory and animal studies and clinical studies of formulas that may differ from ORY® products. Results from these studies may not apply to every person or to ORY® products. This page is not medical advice and does not replace advice from a dermatologist, physician, or other qualified healthcare provider.
ORY® Skincare, Haircare, Handmade Soap, and Cosmetics products are cosmetics. They are not intended to diagnose, treat, cure, mitigate, or prevent any disease or condition, including eczema, dermatitis, acne, dandruff, or any other condition. References to FDA or Cosmetic Ingredient Review (CIR) findings describe the ingredient, not ORY® products, and do not mean FDA has reviewed or approved any ORY® product.
Results vary by skin and scalp type, formulation, and use. Behentrimonium methosulfate is rarely irritating in rinse-off products, and any cosmetic can cause irritation, sometimes from other ingredients. Always patch test, follow label directions, and stop use if irritation occurs. If you are pregnant, nursing, have a medical condition, or are buying for a child, consult a healthcare provider before use.
ORY International, LC works to keep this page accurate and current but makes no warranty as to its completeness. To the fullest extent permitted by law, ORY International, LC is not liable for any loss or injury arising from reliance on this information or from use of any product contrary to its label directions. To report a reaction, contact us at [insert contact email / phone].
