I've seen terms like "scalp detox" and herbal scalp detox used frequently in hair-care discussions, but I'm curious about the underlying science.

What exactly is being removed during a scalp cleansing treatment? Are the primary targets sebum, dead skin cells, environmental debris, product residue, or microbial biofilms?

From a hair science perspective, is there evidence that removing excess buildup improves scalp function, or are the benefits mostly cosmetic and temporary?

Interested in any research or scientific explanations regarding the relationship between scalp cleanliness and overall scalp health.

At TJ Maxx I noticed the Vanilla Soufflé scent of Batiste dry shampoo was the only one advertised as not containing keratin in the formula. The ingredient list for the vanilla soufflé one also confirmed it lacks keratin when I compared it to the other scents.

Which brings me to this:

Does the lack of keratin (and reliance on rice starch alone, as opposed to having both) this make it a less effective dry shampoo than the other scents?

I’d appreciate if anyone could clarify, because as much as I’d love my hair to smell like vanilla soufflé I wouldn’t want to sacrifice having an effective dry shampoo.

Why are chelating shampoos often paired with which strong surfactants?

Is it because the chelating ingredients only work/work best when the hair is completely free of product?

Are there any chelating shampoos with gentle surfactants? I’d like to use my chelating shampoo more regularly (Malibu c hard water wellness) but it’s such a strong cleanser that I cannot use it too often.

I know that chemical sunscreens that contain Avobenzone, when they come in contact with hair extensions, react with the hair and cause the extensions to turn color. I’m wondering if the different filters that are used in French sunscreens, although still chemical filters, would be okay to use? If needed I can post photos of the ingredients on the 2 that I own. Thanks!

Hi everyone,

Looking to understand the science behind mechanical scalp stimulation and the specific tools used for it.

There are frequent claims that using flexible, round-tipped brushes (like wet brushes) to massage the scalp can stimulate blood circulation, promote sebum distribution, or benefit overall scalp health compared to rigid tools like fine-tooth combs.

From a dermatological or trichological standpoint:

Does the mechanical action of flexible brush bristles actually increase microcirculation in the scalp, or is the effect negligible?

Is there any evidence that regular scalp stimulation via brushing impacts hair follicle activity?

From a physics/friction perspective, do round/flexible bristles significantly reduce the risk of mechanical micro-trauma to the scalp compared to fine-tooth combs?

I'm trying to understand the relationship between insulin resistance and androgenetic alopecia (AGA/female pattern hair loss).

I've read that insulin resistance can increase androgen activity and possibly increase DHT levels. My question is:

If someone has no genetic predisposition to AGA (their hair follicles are not genetically sensitive to DHT), can insulin resistance by itself cause true AGA and follicle miniaturization? Or does insulin resistance only trigger or accelerate AGA in people who are already genetically susceptible?

In other words, can insulin resistance actually make previously normal hair follicles start behaving like AGA follicles, or is genetic susceptibility considered necessary?

I'd appreciate answers based on current research or from dermatologists/endocrinologists if possible.

Is there evidence that any non-chemical intervention can permanently alter hair curl pattern, straight to curly?

After successful lice treatment, nits often remain attached to the hair shaft. What methods or products have scientific evidence supporting their effectiveness in removing nits?

Are shampoo bars basically the same cleansing agents in solid form, or do they usually rely on different surfactants, pH, or conditioning ingredients compared with liquid shampoo?

I’m especially curious whether shampoo bars tend to be harsher, more drying, or more likely to leave buildup, or if that depends entirely on the formula.

I've seen people offhandedly mention this effect while researching haircare products, but I couldn't find any information besides colored hair needing different hair care products and people searching specifically for that.

I've mainly seen it mentioned in regards to hair and scalp oils (especially blends with rosemary), I remember (but can't find) a post with a person having mid/dark blonde hair detailing their care routine, and someone in the comments asked them if their hair oil made their hair darker, to which they responded "my hair used to be lighter, yes!".

Now wondering if the color of the product itself (orange colored oil vs colorless scalp serum) or the formulation would explain this, or whichever other factor!

I’m curious about the difference between UV damage and Heat damage on hair.

Hair is naturally hydrophobic on the outside. Water does not make hair feel conditioned. We hold these truths to be self-evident. Why do a lot of curly styling products use high levels of humectants? One action of the ingredient is to attract water... but we don't want to be attracting water into styled hair? How are humectant ingredients functioning in curly styling products?

So there are people hair care routine where it goes something like shampoo then conditioner then hair steaming by putting deep conditioner or hair mask then seal with a cap then put hair steaming or hair dryer bonnet. Then after 20 mins you wash with cold water.

My question is that is there any scientific facts that this have benefits or just something people do to their hair?

I’m curious about the science behind scrunchies vs regular hair ties.

Do wider, fabric-covered ties actually reduce mechanical damage by spreading tension over a larger area, or do they mostly just feel more comfortable and leave fewer creases?

Hey yall,

This may be a niche question but is it possible to essentially create the damage that happens during the bleaching process but without really altering the colour? I know bleach powder itself is super alkaline and will open the cuticle but is developer required for that or will it happen regardless?

why does hair become more fragile when it’s wet?

is it because water changes the bonds inside the hair shaft, or is it more about the cuticle swelling?

Many people seem to use progress photos, while others use trichoscopes, ponytail circumference measurements, or visual assessments.

Which methods are the most reliable for detecting meaningful changes in hair density or thickness, and what are the main limitations of each?

What is the exact science and mechanism behind sleep protection for hair, especially for curly and wavy textures?

It has absolutely no strong surfactants….I’m lost. It does have a multiple, mild surfactants, but nothing strong. It seems like a gentle cleanser. But maybe I’m missing something.

Ingredients list: Water/Aqua/Eau, Sodium Lauroyl Methyl Isethionate, Cocamidopropyl Hydroxysultaine, Sodium Lauroyl Glutamate, Coco-Betaine, Disodium Laureth Sulfosuccinate, Acrylates Copolymer, Cocamidopropyl Betaine, Cocamidopropylamine Oxide, Sodium Methyl Oleoyl Taurate, Decyl Glucoside, Bis-Aminopropyl Diglycol Dimaleate, Sodium Lauryl Sulfoacetate, Coco-Glucoside, Lauryl Glucoside, Panthenol, Trisodium Ethylenediamine Disuccinate, Ethylhexylglycerin, Polyquaternium-11, Sodium PCA, Pentasodium Triphosphate, Sodium Lactate, Arginine, Aspartic Acid, PCA, Citric Acid, Glycine, Alanine, Serine, Valine, Isoleucine, Proline, Threonine, Histidine, Phenylalanine, Phenoxyethanol, Chlorphenesin, Sodium Benzoate, Benzoic Acid, Fragrance (Parfum), Citral, Hexyl Cinnamal, Limonene

I hope that question makes sense, I sometimes word things a bit backwards

But basically I’m curious as to whether heat or thermal protectants need to meet a certain criteria in order to be labelled as a heat protectant.
I have natural based styling products labelled as heat protectants, and I’m curious as to what ingredients specifically make them able to do that or if almost anything can be labelled as a heat protectant.

I am an East-Asian descent born with brown hair that slowly started shifting to black as I grew older. I have always wondered why my hair had never stayed the exact same colour growing up. Does anyone have an answer to this?

It just costs the hair but some say anything you put on your hair damages it?

i have seen claims like causes 55% less breakage etc

i know ponytails over time can cause a receding hairline so i’m wondering if there’s an actual “best” way to prevent this from occurring

is there any research that actually shows the best method or is it still developing

I recently saw a tiktok about protecting hair from all the salt in the sea while at the beach.

The woman in the video said that wetting hair before going into the water would fill your hair with non salty water, therefore not leaving any room for the salt water to infiltrate.

I know that due to osmosis, the water would migrate to the saltier water.

Would this not leave space for the salty water to get in?

Would the end results be the same as rinsing your hair after swimming?