What Is C14-28 Isoalkyl Acid?
C14-28 Isoalkyl Acid is a blend of branched, fully saturated fatty acids whose carbon chains range in length from 14 to 28 atoms. These branched chains give the ingredient a semi-solid, wax-like texture that melts easily at skin temperature and spreads smoothly over hair fibers. Manufacturers usually create the acid by starting with long-chain fatty alcohols or alkanes sourced from plant oils such as coconut, palm or canola, though synthetic routes that begin with petrochemical feedstocks are also common. Through controlled oxidation and purification, chemists convert these starting materials into the branched acid mixture used in cosmetics.
Branched fatty acids first attracted cosmetic chemists in the late 1980s when they were searching for lighter alternatives to traditional straight-chain waxes. The irregular branching helped reduce greasiness while preserving lubricity, making the ingredient a natural fit for hair conditioners. Today C14-28 Isoalkyl Acid appears in rinse-off conditioners, deep-repair masks, leave-in creams, styling balms and some all-in-one cleansing conditioners where it enhances slip and a silky after-feel.
C14-28 Isoalkyl Acid’s Cosmetic Benefits/Uses
In personal care formulas this ingredient serves a single, important purpose.
As a hair-conditioning agent C14-28 Isoalkyl Acid coats each strand with a thin, flexible layer that helps smooth the cuticle, detangle knots, reduce static and boost shine. Its branched structure prevents heavy buildup so hair feels soft not weighed down. The result is easier comb-through, improved manageability and a healthier-looking finish.
Who Can Use C14-28 Isoalkyl Acid
This fatty-acid blend is generally well tolerated by all skin and hair types. Its light, non-greasy film suits dry, normal, oily and sensitive scalps because it adds slip without trapping excess oil or sweat. Very fine or low-density hair might feel a slight coating effect if the formula uses a high dose, yet the branched structure keeps buildup minimal when the product is rinsed properly.
C14-28 Isoalkyl Acid is sourced from plant oils or produced synthetically, not from animal by-products, so it is suitable for vegans and vegetarians unless other animal-derived ingredients are present in the same product.
No studies have linked this ingredient to hormonal activity or systemic absorption, so it is considered safe for those who are pregnant or breastfeeding. This is not medical advice; anyone who is expecting or nursing should review all personal care products with a qualified healthcare provider.
The acid does not make skin or hair more sensitive to sunlight and it has no known interactions with UV filters, so daytime use poses no extra risk of sunburn.
Potential Side Effects/Adverse Reactions
Individual responses to topical C14-28 Isoalkyl Acid vary. The points below outline possible side effects, though most people will not experience them when the ingredient is formulated and used correctly.
- Mild scalp or skin irritation, especially on broken or compromised skin
- Allergic contact dermatitis triggered by rare sensitivity to branched fatty acids or trace impurities
- Folliculitis or clogged follicles if very heavy, leave-in formulas are applied to an already oily scalp
- Reduced effectiveness of leave-on actives such as minoxidil because the ingredient forms a protective film that can slow penetration
If any redness, itching or other discomfort appears, stop using the product and seek guidance from a healthcare professional.
Comedogenic Rating
Rating: 1 out of 5
The branched structure of C14-28 Isoalkyl Acid makes it less likely to settle into pores than straight chain fatty acids. It forms a light, breathable film that usually rinses away with standard shampooing so residue build-up on facial skin is minimal. Because of this low tendency to clog pores it is generally considered suitable for people who are prone to acne or breakouts.
Most formulas containing this ingredient are rinse-off conditioners, which further reduces time of contact with facial skin and limits any chance of pore blockage.
Summary
C14-28 Isoalkyl Acid is used in hair care to smooth cuticles, detangle strands and leave hair soft and shiny. It does this by coating each fiber with a thin, flexible layer that reduces friction without weighing hair down.
While not a headline ingredient, it appears in many mid-range and premium conditioners because it offers a good balance of light feel and lasting slip.
Safety data show a very low irritation and allergy risk for most users, making it a dependable option in daily hair care. As with any new product, patch testing on a small area first is wise, especially for those with sensitive skin.