What Is Bis-(C1-8 Alkyl Lauroyl Lysine Decylcarboxamide) Dimethicone?
Bis-(C1-8 Alkyl Lauroyl Lysine Decylcarboxamide) Dimethicone is a specialty silicone made by bonding dimethicone, a smooth feeling silicone oil, with small chain fatty acids and the amino acid lysine. The fatty acids are usually taken from plant oils such as coconut or palm while the lysine comes from fermentation of plant sugars. Chemists link these parts together in a controlled reaction that keeps the silicone backbone intact then attach the fatty pieces to give the final ingredient a soft cushiony feel.
Silicones have been used in beauty products since the 1950s for their glide and protective qualities. Over time brands wanted silicones that felt less greasy and could add skin care benefits. By grafting natural fatty acids and lysine onto dimethicone, suppliers created this newer hybrid that combines the slip of silicone with the nourishing touch of lipids. It first appeared in high-end primers and color cosmetics about a decade ago and is now finding its way into daily skin care.
You will most often spot Bis-(C1-8 Alkyl Lauroyl Lysine Decylcarboxamide) Dimethicone in lightweight moisturizers, anti aging creams, makeup primers, foundations, sunscreens, sheet masks and leave-on treatments where a silky finish and long-lasting comfort are desired.
Bis-(C1-8 Alkyl Lauroyl Lysine Decylcarboxamide) Dimethicone’s Cosmetic Benefits/Uses
This multi-tasking ingredient brings several helpful roles to a formula:
- Emollient – softens rough patches fills in tiny surface gaps and leaves skin feeling smooth and buttery without heaviness
- Skin Protecting – forms a light breathable film that shields skin from wind cold and pollution helping reduce moisture loss through the day
- Viscosity Controlling – thickens watery formulas or thins heavy creams giving chemists precise control over texture so the end product spreads evenly and absorbs at the right speed
Who Can Use Bis-(C1-8 Alkyl Lauroyl Lysine Decylcarboxamide) Dimethicone
This silicone hybrid is generally friendly to all skin types. Its light cushioning feel makes it a welcome addition for dry and mature skin while the breathable film keeps oily and combination complexions from feeling weighed down. Sensitive skin usually tolerates it well because the molecule is large and stays on the surface rather than sinking in where it could cause stinging. If your routine is strictly silicone free or you know you react poorly to dimethicone you may choose to avoid it, but most users see no issues.
The building blocks of this ingredient come from plant oils and fermented plant sugars, so it is suitable for vegans and vegetarians. As always verify the finished product’s cruelty free status with the brand if animal testing is a concern.
Current research shows no safety red flags for pregnancy or breastfeeding. The molecule is too big to penetrate deeply and is considered chemically inert, yet this is not medical advice. Expectant or nursing parents should run any skincare product by their doctor just to be safe.
Bis-(C1-8 Alkyl Lauroyl Lysine Decylcarboxamide) Dimethicone does not make skin more sensitive to sunlight and has no known conflicts with common actives such as vitamin C or retinoids. It can even improve wear time of sunscreen by helping create an even film.
Potential Side Effects/Adverse Reactions
Reactions to topical Bis-(C1-8 Alkyl Lauroyl Lysine Decylcarboxamide) Dimethicone differ from person to person. The points below are possible outcomes but they are rare when the ingredient is used at normal cosmetic levels and formulated correctly.
- Transient stinging or redness on extremely sensitive or compromised skin
- Very mild clogging or bumpiness in individuals who find any film formers problematic
- Allergic contact dermatitis in those with a specific silicone or fatty acid allergy, though this is uncommon
- Increased absorption of other ingredients under the film occasionally heightening potency of strong actives
If irritation or any unwanted reaction occurs stop using the product and consult a healthcare professional or dermatologist.
Comedogenic Rating
Rating: 1/5
The dimethicone base is inherently non pore clogging and the short chain fatty acids attached to it are too light and irregular to pack inside follicles. The large hybrid molecule stays on the surface, limiting its ability to trap oil or dead cells. Typical use levels are low and often paired with quick evaporating silicones that further cut residue. Most acne prone users can tolerate it, though individuals who avoid all film formers might still choose alternatives.
Because it creates a breathable film it can slightly extend the wear of heavier oils or pigments in the same product, so thorough cleansing at night helps keep pores clear.
Summary
Bis-(C1-8 Alkyl Lauroyl Lysine Decylcarboxamide) Dimethicone works as an emollient, skin protectant and viscosity controller. Its silicone spine glides over skin while the bonded fatty acids and lysine fill tiny gaps to leave a soft cushiony feel. The ingredient also sets up a lightweight barrier that slows water loss and fine tunes texture so products spread evenly without feeling greasy.
Although not as well known as plain dimethicone, it is becoming more common in primers, tinted moisturizers and modern sunscreens thanks to its silky touch and breathable finish.
Available data shows it is stable, non sensitizing and safe for regular use. Still, give any new product containing this ingredient a quick patch test to ensure your skin responds well.