Conditioner: Everything You Need to Know

Conditioner: Everything You Need to Know

By Hairstory

Published on September 27, 2024 — 7 min read

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These days, you’ll probably be warned not to skip conditioner every time you shampoo your hair. 

The important part is the “every time you shampoo” part because while your hair can theoretically live without conditioner, it will suffer if you only use traditional – or detergent-based – shampoo. In other words, conditioning treatment of any kind is useful for healthy hair to retain moisture and essential oils.

Before we outline how conditioners work with your hair, let’s review a brief history of conditioner.



ANCIENT TIMES

Ancient Egyptians shaved off their hair more often than washing it in favor of wigs washed frequently using citrus juice and conditioned with almond oil.

Being that hair cleansing products were unavailable during their time, Ancient Greeks and Romans used olive oil, naturally, to soften hair. Alternatively, indigenous peoples all over the world over used rainwater mixed with wood ash to help hair feel silkier.



AT-HOME HAIRCARE

Italian women during the Renaissance used bacon fat and licorice – or dead lizards boiled in olive oil – to condition after washing with lye soap.

By the 19th century when Castile Soap was the most common cleanser, “Macassar oil,” made from oils of coconut, palm, and ylang-ylang flowers was a popular conditioner.

In the 1950s, eggs and flat beer were popular conditioners at home and in the salon. Early commercial hair products were called “creme rinse.”



COMMERCIALIZATION

One of the first commercial conditioners was created for men as “Brilliantine” to soften moustache mustache and beard hair.

The 1980s saw the introduction of 2-in-1 convenience formulas to cleanse and condition at the same time and theoretically save time and money.

In the early 2000s, co-washing, or conditioner-only washing became popular among women of with curly hair, particularly in the Black community.

Now that we have a little history on conditioner, we’ll move to hair and how it works.



HAIR COMPONENTS

Hair has three main components: protein, mainly a type called keratin; natural oils to keep hair moisturized and protected, and water.



THE CUTICLE

The outside, called the cuticle, is comprised of 5 to 10 overlapping layers of protein arranged like shingles on a roof, or scales on a fish. It protects the middle section called the cortex inside of which runs long bundles of protein fibers.

Learning how to wash your hair properly will help to protect the cuticle from drying out or getting damaged.

When the cuticle’s shingles lie flat and closed, light reflects more clearly and hair looks shiny. When they stand up and open, hair appears dull, can look frizzy, and is, in fact, more vulnerable to damage. Because most shampoos work too well and strip away the hair’s natural oil, the scalp produces even more to compensate. This results in damaged hair strands that become brittle and lack moisture.

And that’s why you need conditioner: to replace some of those essential oils and to smooth the hair cuticles so they lay flat and look shiny after shampoo roughs them up. It’s a vicious cycle.

Another way to avoid stripping away your hair’s natural oil is by not washing your hair too frequently. See more about how often should you wash your hair.



WHAT DOES CONDITIONER DO?

Most rinse-out conditioners employ molecules, called cationic surfactants, to do most of the work. At one end of every molecule is a positive charge that binds to the negative charge of a hair strand; the more damaged hair is, the stronger the charge. Surfactants surround the strand and cause the cuticle shingles to lie snugly against each other, and hair feels smooth again, even after rinsing. Conditioning surfactants can also be designed to deliver other cosmetic substances, such as silicone.

In addition, conditioners, especially leave-in formulas, such as Hair Balm, work similarly to skin moisturizers with ingredients that either help block the loss of water, or attract it. Emollients, mainly lipids and oils, prevent evaporation of water by forming a barrier; the waxier the ingredient, the more pronounced the effect. Humectants may also have an emollient effect, but by attracting rather than repelling water. More lipids in a formulation mean a greater emollient effect.


HOW DEEP ARE DEEP CONDITIONERS?

Deep conditioners are little more than regular conditioners that sit on your head longer, feel a bit thicker, and probably packaged in something that looks more like skincare than haircare. But hair will only absorb what it needs, and you could leave it in all day to no end. That extra product in your shower is more feel-good than do-good – pampering in a fancy jar.


WHAT IS CO-WASHING?

Co-washing simply means skipping washing your hair without shampoo – and only using conditioner instead – a method pioneered by “curly girls” to preserve natural texture. But the problem is that conditioner alone does not actually clean hair, and most people users still need shampoo to break down build-up that can impact the follicles.


WHAT IS A CLEANSING CONDITIONER?

To solve co-washers’ cleansing problem, a category of hair products marketed as cleansing conditioners was born – halfway between shampoo and conditioner and formulated with more of the latter than the former. While improving upon early 2-in-1 formulas, the problem is that they still contain detergent, and you’re trying to replace oils while you’re stripping them from your hair. It just doesn’t add up.


WHAT’S THE SOLUTION?

It is possible to cleanse and condition with one product. How? Wash the new way with New Wash. The difference? No detergent. In some ways, what it doesn’t do is more important than what it does do; it’s an oil-based cleansing product that doesn’t strip the good stuff from your hair in the first place, and many of the same ingredients also act as conditioners. If you want to figure out how to make your hair grow faster and stronger, consider this 3-in-1 product by Hairstory. And that means just one product in the shower where you might have 3: shampoo, conditioner, and deep conditioner. And that’s a condition we can all live with.

Frequently Asked Questions

  • What does conditioner do for your hair?
    Conditioner uses cationic surfactants—molecules with a positive charge—that bind to the negative charge of hair strands, smoothing the cuticle layers so they lie flat and reflect light clearly. This restores essential oils stripped away by shampoo, reducing frizz and dullness. Leave-in formulas like Hairstory's Hair Balm also contain emollients and humectants that prevent moisture loss or attract water to the hair strand.
  • Why do you need conditioner every time you shampoo?
    Traditional detergent-based shampoos strip the hair's natural oils, causing the cuticle's protective layers to stand up—leaving hair dull, frizzy, and vulnerable to damage. The scalp then overproduces oil to compensate, perpetuating a damaging cycle. Conditioner helps replace those lost oils and smooth the cuticle back down after each wash.
  • What is co-washing and does it actually clean hair?
    Co-washing means washing hair with conditioner only, skipping shampoo entirely—a method popularized by curly-haired communities to preserve natural texture. However, conditioner alone does not actually clean hair; most people still need a cleanser to break down buildup that can impact the follicles. A detergent-free cleansing cream like New Wash by Hairstory offers a better solution—it cleanses without stripping natural oils.
  • Are deep conditioners more effective than regular conditioners?
    Deep conditioners are essentially regular conditioners with a thicker texture that are left on longer, often packaged to look more like skincare. Hair only absorbs what it needs, so leaving a deep conditioner on for extended periods doesn't deliver meaningfully better results. They offer more of a pampering experience than a scientifically superior treatment.
  • What is a cleansing conditioner?
    A cleansing conditioner is a hybrid hair product formulated with more conditioner than shampoo, designed to cleanse and condition in one step. While an improvement on early 2-in-1 formulas, cleansing conditioners still contain detergent—meaning they strip natural oils while simultaneously trying to replace them, a contradictory approach that limits their effectiveness.
  • Is there a product that truly replaces both shampoo and conditioner?
    New Wash by Hairstory is a detergent-free cleansing cream that cleanses and conditions in a single step without stripping the hair's natural oils. Because it's oil-based rather than detergent-based, it avoids the damage cycle created by traditional shampoo, and many of its ingredients act as conditioners simultaneously—eliminating the need for a separate conditioner for most users.
  • How does the hair cuticle affect shine and frizz?
    The cuticle is the outermost layer of each hair strand, composed of 5 to 10 overlapping protein layers arranged like shingles on a roof. When these layers lie flat, light reflects clearly and hair appears shiny. When they stand up—often caused by detergent-based shampoos stripping natural oils—hair looks dull and frizzy and becomes more vulnerable to damage.
  • What are the main components of hair?
    Hair has three main components: protein (primarily keratin), natural oils that keep hair moisturized and protected, and water. The outer layer, called the cuticle, consists of overlapping protein layers that protect the inner cortex, which contains long bundles of protein fibers. Maintaining the balance of these components is essential to healthy, strong, shiny hair.

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