By Dr. Shweta Lamba Narula,
Hair frizz in humidity is caused by hydrogen bond disruption in the hair shaft. In dry conditions, the hydrogen bonds within the hair's cortical cells hold the shaft in its natural shape. In humid air, water molecules penetrate the raised cuticle of porous or damaged hair and disrupt these temporary hydrogen bonds, causing the cortex to swell unevenly and the hair to puff outward. Hair with intact cuticles and adequate protein content is significantly less susceptible to humidity frizz because the cuticle acts as a moisture barrier. Keratin-reinforcing shampoos temporarily fill cuticle gaps and smooth the surface, reducing the rate at which moisture penetrates.
What Is the Exact Mechanism of Humidity Frizz?
Hair fibre consists of a cortex of keratin protein bundles surrounded by a cuticle of overlapping cells. The cuticle controls moisture exchange. Chemical processing, heat styling, and mechanical damage lift the cuticle, increasing porosity and susceptibility to humidity-driven swelling.
High-porosity hair - common after bleaching, relaxing, or frequent heat styling - has an irregular cuticle surface with gaps. In Mumbai and Chennai monsoon conditions (80-90%+ relative humidity), water vapour enters these gaps rapidly, causing uneven cortex swelling. The result is the characteristic monsoon frizz that even freshly washed and styled hair develops within minutes of stepping outside.
How Keratin Treatments (and Keratin Shampoos) Help?
Professional keratin treatments deposit a keratin-formaldehyde or formaldehyde-free substitute that fills cuticle gaps and seals the hair surface. The results last 2-3 months because the treatment chemically bonds to the cortex. A keratin-based shampoo works differently - it deposits hydrolysed keratin and conditioning polymers at the surface during washing. These temporarily fill gaps and reduce surface roughness, but the effect lasts only between washes, not months.
Hydrolysed keratin has a molecular weight small enough to partially penetrate the cuticle during washing. Its protein structure is complementary to the hair's own cortical keratin, which helps it adhere temporarily. The result is smoother surface texture, reduced combing force, and better humidity resistance - for that wash cycle.
Pilgrim's Keratin + Patua Smoothening Shampoo
Pilgrim Keratin & Amazonian Patua Smoothening Shampoo combines hydrolysed keratin with Amazonian Patua oil - a rich lipid source from the Patua palm (Oenocarpus bataua) traditionally used for hair nourishment. The oil component provides the lipid layer over the deposited keratin, which is crucial for sealing the cuticle surface after the protein fills gaps.
The combination addresses both the structural (protein gap-filling) and lipid-barrier (cuticle-sealing) aspects of frizz resistance - making it more comprehensive than a keratin-only or conditioning-oil-only approach.
Frequently Asked Questions
Why does my hair frizz even after I straighten it?
Straightening with heat temporarily rearranges the hydrogen bonds in the cortex. In humidity, water reactivates those bonds in their natural frizzy configuration. Without a heat-protectant sealant or keratin-based coating, the straightening effect reverses in humid air.
Is a keratin shampoo the same as a keratin treatment?
No. A professional keratin treatment chemically bonds to the cortex for 2-3 months. A keratin shampoo deposits protein at the surface during each wash for temporary smoothing - the effect is per-wash, not permanent.
How should I use a smoothening shampoo for best results?
Leave the shampoo in for 2-3 minutes before rinsing (unlike a regular shampoo) to allow the keratin time to deposit on the cuticle. Follow with a protein-containing conditioner and apply a small amount of hair serum when towel-dried.
Does protein overload cause damage?
Yes - using multiple high-protein products (protein shampoo + protein mask + protein serum) daily can make hair brittle over time. Use a keratin shampoo 2-3 times per week and balance with a moisturising product on alternate washes.
Can I use this shampoo if my hair is colour-treated?
Yes. Keratin shampoos are generally safe for colour-treated hair and can help repair the porosity increased by chemical colouring. Use a colour-safe formula if colour fade is a concern.
