What Is Bis(C13-15 Alkoxy) Hydroxybutamidoamodimethicone?
Bis(C13-15 Alkoxy) Hydroxybutamidoamodimethicone is a man-made silicone polymer designed for hair care. Chemically it is a form of amodimethicone that has been modified with C13-15 fatty alcohol groups and a hydroxybutamide link. These additions let the silicone spread easily over hair strands and bind more evenly than older silicones.
Silicones began appearing in shampoos and conditioners in the 1970s as a quick way to give hair slip and shine. Over time chemists tweaked the basic structures to fix issues like heavy buildup or dulling. Bis(C13-15 Alkoxy) Hydroxybutamidoamodimethicone came from that effort. By attaching medium-length (C13-15) alkoxy chains, the polymer became lighter and more compatible with both water and oils, making it a popular choice for modern formulas.
Production starts with standard amodimethicone. Through controlled reactions, fatty alcohol chains (derived from plant oils or petroleum fractions) are grafted onto the silicone backbone. A hydroxybutamide group is then introduced to improve the polymer’s ability to cling to damaged hair areas without feeling sticky. The final material is purified, checked for quality then supplied as either a fluid or a water-dispersible concentrate to cosmetic manufacturers.
You will usually spot this ingredient in rinse-out conditioners, deep-conditioning masks, leave-in creams, anti-frizz serums, heat protectant sprays and color-care treatments where smoothness and manageability are key selling points.
Bis(C13-15 Alkoxy) Hydroxybutamidoamodimethicone’s Cosmetic Benefits/Uses
This silicone is valued almost solely for its hair conditioning ability, and that single role covers a lot of ground in daily hair care.
As a hair conditioning agent it forms a thin, flexible film over the cuticle that reduces friction so strands detangle with less breakage. The film reflects light which boosts shine, helps seal in moisture so hair feels softer and can even smooth raised cuticles on damaged areas leading to less frizz. Because the C13-15 alkoxy groups are moderately light, the finish is silky rather than greasy which makes the ingredient suitable for fine or oily hair types as well as thick coarse textures.
Who Can Use Bis(C13-15 Alkoxy) Hydroxybutamidoamodimethicone
The polymer is considered suitable for all scalp and hair types including sensitive, oily, dry and combination scalps because it is inert, non acidic and does not disturb the skin’s natural pH. Its lightweight film tends not to clog follicles so even users prone to buildup or cosmetic acne generally tolerate it well. Those with very fine hair may still prefer lower concentrations to avoid flatness.
Because the molecule is fully synthetic and the C13-15 alkoxy chains can be sourced from plant oils or petrochemicals rather than animal fats, the ingredient itself is vegan and vegetarian friendly. Final product status depends on the other materials the brand adds.
Current safety reviews show no evidence of systemic absorption, endocrine activity or developmental toxicity, so products containing this silicone are widely viewed as safe for pregnant or breastfeeding women. This is not medical advice and anyone who is expecting or nursing should confirm any new hair product with their physician to be sure it fits their individual needs.
Bis(C13-15 Alkoxy) Hydroxybutamidoamodimethicone is not known to cause photosensitivity, so there is no added need for sun protection beyond normal daily habits.
Potential Side Effects/Adverse Reactions
Responses to topical Bis(C13-15 Alkoxy) Hydroxybutamidoamodimethicone vary from person to person. The points below outline potential, though uncommon, reactions. When the ingredient is used correctly in a well formulated product most people will not notice any problems.
- Mild scalp irritation or itching in individuals who are sensitive to silicones
- Eye stinging or watering if the product accidentally runs into the eyes during application or rinsing
- Product buildup that leaves hair looking weighed down or dull when formulas containing high levels are layered repeatedly without clarifying washes
- Rare allergic contact dermatitis resulting in redness, rash or small bumps
If any uncomfortable reaction occurs stop using the product and consult a healthcare professional or dermatologist for guidance.
Comedogenic Rating
Rating: 1 / 5
Bis(C13-15 Alkoxy) Hydroxybutamidoamodimethicone is a large, inert silicone polymer that sits on the surface of skin and hair rather than soaking into pores. Its lightweight alkoxy side chains help it spread without forming an occlusive, greasy layer, so it is very unlikely to clog follicles. A small chance of buildup exists if several heavy silicone products are layered without proper cleansing, which is why the rating is not a flat zero.
This low score means the ingredient is generally suitable for people who are prone to acne or scalp breakouts.
If you use multiple silicone rich products, an occasional clarifying wash can keep residue from collecting on skin or hair shafts.
Summary
Bis(C13-15 Alkoxy) Hydroxybutamidoamodimethicone is a modern hair conditioning silicone that smooths cuticles, adds slip for easier detangling, locks in moisture and boosts shine. The C13-15 alkoxy groups make the polymer lighter and more compatible with water than classic dimethicone, so it delivers softness without a greasy feel.
While not as famous as dimethicone it shows up in plenty of mid and high tier conditioners, masks, leave-ins and heat protectants where brands want a silky finish that still rinses clean. Its popularity is steady rather than blockbuster, mainly because it costs a bit more to make and formulate.
Safety data are strong: the molecule does not absorb through skin, shows no hormonal activity and rarely irritates. Most people, including those who are pregnant, breastfeeding, sensitive or acne prone, use it without trouble. As with any new cosmetic ingredient it is smart to patch test a product first to confirm your personal compatibility.