The Truth about Hyaluronic Acid in Haircare
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By Ramya Viswanathan, Cosmetic Chemist & Founder of CMPRESSD Beauty
When you look at your skincare routine, there is a strong chance at least one of your products contains hyaluronic acid (HA). Recognized as a hydration powerhouse capable of holding up to 1,000 times its weight in water, HA is a gold-standard ingredient for skin.
Around 2021, the "skinification of hair" trend exploded on social media, leading to viral TikTok videos of people applying skincare hyaluronic acid serums directly onto wet hair.
We know hyaluronic acid hydrates skin, but does standard hyaluronic acid actually hydrate hair, or does it just wash down the drain?
The Science: Why Standard Hyaluronic Acid Fails on Hair
A 2022 study by Wenje Qu et al. showed that low molecular weight hyaluronate can slightly improve the mechanical strength of damaged hair when left on. However, standard skincare hyaluronic acid presents a fundamental formulation problem when applied to hair: ionic charge repulsion.
- Hair Strands Are Anionic and Carry a Negative Charge (-): Damage from heat styling, chemical processing, and environmental stress further increases the negative charge on the hair cuticle.
- Standard Hyaluronic Acid Is Also Anionic (-): Because like charges repel, standard hyaluronic acid cannot adhere to the hair shaft. When you rinse your hair, the ingredient washes right down the drain before delivering lasting conditioning benefits.
For a haircare ingredient to be substantive (meaning it stays attached to the hair shaft after rinsing), cosmetic chemists incorporate positively charged (+) ingredients into formulations.
What Is Cationic Hyaluronic Acid?
Cationic Hyaluronic Acid (Hydroxypropyltrimonium Hyaluronate) is a novel form of hyaluronic acid that is modified to carry a positive charge (+).
Because hair is negatively charged, cationic hyaluronic acid magnetically adheres to negatively charged sites along the hair cuticle. This ionic bond improves the ingredient's adsorption, allowing it to:
- Form a light, non-greasy protective film over the hair shaft.
- Smooth the cuticle layer.
- Minimize frizz and improve tensile strength against breakage.
Cosmetic Chemist POV
When I first began to ideate CMPRESSD Beauty, the goal was to create concentrated haircare engineered around functional surface chemistry for immediate results and long-term benefits.
Our Hyaluronic+ Solid Shampoo Bar utilizes cationic hyaluronic acid and meadowfoam seed oil to improve the condition of breakage-prone hair.
At a third-party testing lab, we conducted both instrumental analysis as well as real-use consumer testing across high-humidity climates. Users testing our cationic hyaluronic acid solid shampoo and conditioner bars reported:
- Measurable reduction in hair frizz
- 2x less hair breakage
- Noticeably smoother, healthier-looking hair after one wash
Frequently Asked Questions
Does hyaluronic acid work on dry or high-porosity hair?
Standard hyaluronic acid only provides a temporary effect. For high-porosity or dry hair, cationic hyaluronic acid is beneficial because its positive charge allows better adhesion to the negatively charged sites on porous or dry hair.
What are the benefits of using Cationic Hyaluronic Acid in Solid Hair Care?
We chose to make our shampoo and conditioner in a concentrated format to minimize unnecessary ingredients whilst also improving product and ingredient stability.
Scientific References
1. Qu, W., et al. (2022). Improving the mechanical properties of damaged hair using low molecular weight hyaluronate. Molecules, 27(22), 7701.