Behentrimonium Methosulfate

Behentrimonium Methosulfate (BTMS) is a quaternary ammonium compound derived from rapeseed oil. It functions primarily as a conditioning agent and emulsifier in cosmetic formulations. BTMS helps to detangle hair, reduce static, and leave a soft, smooth feel on both hair and skin.

BenefitModerate 1.5 / 4

Hydration i1 / 4

Whether the ingredient helps increase the skin’s water content — humectants that attract water, ingredients that reduce water loss, or ones that make skin feel less dry.

Barrier support i0.5 / 4

Whether it supports the skin barrier — restoring lipids, reducing water loss, aiding barrier repair, or strengthening the skin’s protective function.

RiskLow 0.5 / 4

Eye irritation i0.5 / 4

Whether it may sting or irritate around the eyes. Relevant for sunscreens, fragrances, acids, surfactants, and volatile ingredients.

Sensitization i0.5 / 4

Risk of allergic contact dermatitis or immune-based reactions. Fragrance allergens, preservatives, botanicals, and some dyes may score here.

Irritation i0.5 / 4

Risk of short-term irritation — stinging, burning, dryness, redness, or discomfort. Common for strong actives, acids, retinoids, fragrances, and harsh surfactants.

Rated by SpottyLabs' ingredient methodology, independent of brands.

What it helps with

• Excellent hair conditioning
• Effective detangling
• Reduces static
• Provides a soft feel

Products with Behentrimonium Methosulfate

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Frequently asked questions

Is Behentrimonium Methosulfate a sulfate?

Despite 'sulfate' in its name, Behentrimonium Methosulfate is not a sulfate in the same class as harsh cleansing sulfates like SLS. It is a conditioning agent and emulsifier.

What is the origin of Behentrimonium Methosulfate?

Behentrimonium Methosulfate is typically derived from rapeseed oil, making it a plant-based ingredient, though its vegan status can depend on the specific manufacturing process.