Shampoo bars have gone from being a fairly niche alternative to becoming an obvious choice for more and more people who want concentrated hair care in solid form.
But not all shampoo bars are the same.
A modern shampoo bar can be anything from a fairly simple cleansing product to an advanced shampoo with mild cleansers, proteins, moisture-binding ingredients, and ingredients selected for different hair types.
So what is a shampoo bar really? How do you use it? How long does it last? And perhaps most importantly – how do you choose the right shampoo bar for your hair?
Here we go through everything you need to know.
What is a shampoo bar?
A shampoo bar is shampoo in solid, concentrated form.
Instead of the product coming as a liquid mixture in a bottle, the ingredients are pressed together into a compact bar that is activated when it comes into contact with water.
You wet your hair and the shampoo bar, work up a lather, and then wash your hair in about the same way as with a regular shampoo.
The big difference, therefore, is not in what the product is intended to do.
A good shampoo bar should still cleanse the hair and scalp effectively, lather well, and leave the hair feeling pleasant after washing.
But because the product is concentrated, only a small amount is needed at each use.
Shampoo bar and hair soap are not the same thing
This is one of the most important things to know when you start looking at shampoo bars.
A shampoo bar can look roughly like a bar of soap – but a modern shampoo bar does not need to be soap at all.
Traditional soap is made through saponification of fats and usually has a relatively high pH value. A solid shampoo can instead be made with the same type of cleansing agents used in modern liquid shampoos.
Grow Naturals shampoo bars use, for example, Sodium Cocoyl Isethionate, often abbreviated as SCI, as a cleansing base. It is a mild surfactant that makes it possible to create a rich and creamy lather without the product needing to be a traditional soap.
Our shampoo bars are also formulated with a pH around 5.0–5.5, close to the hair's and scalp's naturally acidic environment.
When you compare different shampoo bars, it is therefore better to look at how the product is actually formulated than to just state that it comes in solid form.
How does a shampoo bar work?
When the shampoo bar comes into contact with water, its cleansing ingredients begin to dissolve from the surface.
A few swipes over the wet hair are enough to release the product and create a lather. When you then massage the scalp, the cleansing is spread over the hair in the same way as with a liquid shampoo.
Because the bar is concentrated, you only take the amount you need at each wash.
That is also why a relatively small shampoo bar can last surprisingly long.
At Grow Natural, our shampoo bars weigh 60 grams and last up to 60–90 washes, depending on factors such as hair length and how much product you use.
Are shampoo bars good for hair?
It depends entirely on the shampoo bar.
That a shampoo is solid actually says very little about the quality of the product.
Just like with liquid shampoo, there are simpler and more advanced alternatives.
What we think is significantly more interesting is what cleansing base is used, the product's pH, and what conditioning ingredients are actually in the product.
A well-formulated shampoo bar can combine mild cleansing with, for example, glycerin, vegetable fats, oils, and hydrolyzed proteins.
This means that there does not need to be any contradiction between choosing a concentrated shampoo bar and at the same time wanting advanced hair care.
On the contrary, it was precisely that opportunity that made the shampoo bar interesting to us from the beginning.
A shampoo bar does not need to be a compromise
Solid hair care was marketed for a long time primarily with arguments such as less plastic, less packaging, and easier travel.
Those are good benefits.
But we think the bar should be set significantly higher than that.
When we develop a shampoo bar, we do not start with the question:
"How do we make a regular shampoo solid?"
Instead, we start with:
"What do we want this product to do for the hair?"
That is why our different shampoo bars also look different at the ingredient level.
Fine and flat hair does not have the same needs as dry and damaged hair. And someone with a sensitive scalp might prioritize something completely different.
The format is the same.
The purpose of each shampoo bar is not.
How do you use a shampoo bar?
It is easy once you have done it the first time:
- Wet the hair thoroughly. Soaking wet hair makes it easier to distribute the product.
- Wet the shampoo bar. Hold it briefly under the water so that the surface becomes wet.
- Swipe the bar a few times over the hair. With our shampoo bars, around 3–4 swipes usually suffice to start building up a rich lather.
- Put the bar aside and massage with your hands. Work up a good lather in the scalp and let it distribute through the hair.
- Rinse thoroughly and let the shampoo bar dry. Then it is ready for the next wash.
So you do not need to stand and rub the shampoo bar through all the hair.
Use it to apply a small amount of product and then let your hands do the rest.
Should you shampoo once or twice?
You do not automatically need to shampoo the hair twice just because you use a shampoo bar.
For most, one good shampooing is enough.
Two washes, however, can be useful if you have a lot of styling products, dry shampoo, oil, or other product residue in the hair.
It is therefore less about what hair type you have and more about how much needs to be washed out.
If the hair and scalp are clean after the first shampooing, there is no reason to do a second one just out of habit.
How long does a shampoo bar last?
It varies between different products because size, hardness, and concentration differ.
Your own usage also plays a big role. Long and thick hair often requires more product than short hair, and someone who washes their hair every day naturally uses up the bar faster than someone who washes twice a week.
Grow Naturals shampoo bars weigh 60 grams and last up to 60–90 washes.
This means that a small bar can replace many months of using liquid shampoo for some users.
It is also one of the reasons why you should not compare the price of a shampoo bar and a shampoo bottle solely based on the size of the packaging.
What is relevant is rather how many washes you actually get.
How do you store a shampoo bar?
The most important thing is to let the bar dry between uses.
If it lies constantly in water or on a wet surface, it will slowly dissolve even when you are not using it.
Therefore, place it in a well-ventilated area on, for example, a holder where the water can drain away.
When the bar gets to dry properly, it retains its solid form longer and you get significantly more out of the product.
It is a small detail that can make a big difference to how long your shampoo bar lasts.
Which shampoo bar should you choose?
This is where it becomes significantly more interesting than just choosing the scent you like best.
We think you should choose a shampoo bar based on what your hair and scalp actually need.
Shampoo bar for fine, thin, or flat hair
For hair that easily feels flat, you usually want to cleanse thoroughly without weighing the hair down.
Here, Rosemary & Caffeine is our first choice.
It combines mild cleansing with, among other things, caffeine, rosemary, and hydrolyzed rice protein. Above all, the rice protein is interesting for those who want to give the hair strands more body and get a fuller feel.
The result is a shampoo bar developed with a focus on volume, fullness, and the scalp.
Shampoo bar for dry, frizzy, or damaged hair
If the hair has instead become dry, porous, frizzy, or damaged, you need to think differently.
Here we have developed Ginger & Lemon.
It contains both hydrolyzed rice protein and hydrolyzed baobab protein together with, among other things, glycerin, coconut oil, and conditioning vegetable fats.
The idea is to combine mild cleansing with more intensive care for hair that needs softness, strength, elasticity, and better manageability over time.
Shampoo bar for sensitive or dry scalp
If the problem is primarily in the scalp, Eucalyptus & Tea Tree is our mildest alternative.
It is developed for those who experience a sensitive, dry, or easily irritated scalp and want a simple, mild cleansing without compromising on the creamy feel of a real shampoo.
The most important thing, therefore, is not to find a shampoo bar that is claimed to suit everyone.
It is to find the right shampoo bar for your hair.
Shampoo bar or liquid shampoo – which is best?
There is nothing magical about solid form that automatically makes a product better than all liquid shampoos.
But there are some clear differences.
A liquid shampoo needs a liquid base to be able to be poured from a bottle. A shampoo bar can instead be made significantly more concentrated and is activated only when you add water in the shower.
This means less volume to package, store, and transport.
But for us, the most interesting difference is not the packaging.
It is how much hair care can be concentrated in a small bar.
Our shampoo bars do not just contain a cleansing base. Depending on the variant, we use ingredients such as hydrolyzed rice protein, caffeine, rosemary, hydrolyzed baobab protein, glycerin, coconut oil, and various botanical ingredients.
That is why we rather see them as concentrated hair care than as an environmentally friendly substitute for bottle shampoo.
Do you need conditioner after a shampoo bar?
Not necessarily.
It depends on the hair, the shampoo bar, and what result you want.
Short, untreated, or naturally soft hair can manage perfectly without conditioner after every wash. Longer, curly, bleached, or damaged hair, however, often has greater benefit from extra conditioning in the lengths.
Many who switch from a stronger cleansing shampoo to a milder shampoo bar also experience that the need for conditioner changes.
The best is therefore to go from how the hair actually feels instead of following a rule that conditioner must always be used.
Can shampoo bars give as much lather as regular shampoo?
Yes.
How much a shampoo bar lathers depends above all on what cleansing ingredients are used and how the product is formulated.
One of the things we prioritized when we developed Grow Natural was therefore the experience in the shower.
Our bars are made to give a rich and creamy lather after just a few swipes.
For us, it should not feel like you are accepting a worse hair wash because the product happens to be solid.
It should feel like a really good shampoo.
Period.
Common mistakes when using a shampoo bar
You use way too much
It is easy to assume the amount of liquid shampoo you used to pour into your hand.
But a shampoo bar is concentrated.
Start with a few swipes. You can always use more if needed.
The hair is not wet enough
Water helps the product distribute and build up the lather.
The better soaked wet the hair is, the easier the application becomes.
You keep rubbing the bar despite already having enough
When there is product in the hair, you should put the bar aside and massage with your hands.
More product does not automatically mean better cleansing.
The bar should never dry out
A shampoo bar left wet between showers will wear out faster.
Storage is therefore more important for solid shampoo than for a product that stays sealed in a bottle.
Are shampoo bars good for travel?
They actually have a very clear practical advantage in this area.
The shampoo bar is compact, takes up little space, and you don't have to worry about a bottle leaking in your bag.
Because it is a solid product, you also don't need to handle it like regular liquid shampoo when packing your liquids for a flight.
Just let the bar dry before placing it in a travel container.
What to look for in a good shampoo bar?
First, look at the cleansing base. Is it a modern solid shampoo formula or a traditional soap?
Then look at the pH level, especially if the manufacturer states it.
Next comes what is often most interesting: the conditioning ingredients.
Are they there for a clear reason? Do they address the hair problem the product claims to be developed for?
And finally: don't forget the user experience itself.
A good shampoo bar should be easy to use, lather properly, rinse out easily, and hold together between washes.
Solid form is not a quality measure in itself. The formula behind the bar is what matters.
Shampoo bars without silicones
Another reason many people are starting to look more closely at shampoo bars is the opportunity to build hair care in ways other than traditional silicone and polymer systems.
Not all such ingredients are the same, but some are used primarily to create immediate softness, glide, and shine by coating the surface of the hair strand.
We have chosen a different path.
In our shampoo bars, we instead work with hydrolyzed proteins, glycerin, vegetable fats, and oils to create the conditioning feel, while the hair is cleansed with a mild cleansing base.
The goal is not to make the hair dependent on more and more layers of product to feel good.
The goal is for it to feel good when it is clean.
Shampoo bars for different needs – not one bar for everyone
One thing that has changed a lot with modern shampoo bars is that the category has become significantly more specialized.
You no longer need to choose between "shampoo bar" and "regular shampoo".
Instead, you can choose a shampoo bar for volume, a shampoo bar for damaged hair, or a shampoo bar for a sensitive scalp.
That is how we think the category should develop.
Not by trying to squeeze all hair types into the same product, but by utilizing the concentrated format to create different products with different purposes.
Frequently asked questions about shampoo bars
What is a shampoo bar?
A shampoo bar is a solid and concentrated shampoo that is activated with water. It is used to cleanse the hair and scalp in the same way as liquid shampoo, but comes in a compact bar form.
Are a shampoo bar and a shampoo bar the same thing?
Yes. Shampoo bar, shampoo bar, and solid shampoo are commonly used as different names for the same type of product.
Is a shampoo bar the same thing as hair soap?
No, not necessarily. A modern shampoo bar can be based on mild surfactants and have a pH developed for hair and scalp, while traditional hair soap is based on saponified fats.
How do you use a shampoo bar?
Wet the hair and the bar, apply a small amount to the hair, set the bar aside, massage up a lather with your hands, and rinse thoroughly.
How long does a shampoo bar last?
It depends on the size and concentration of the product, as well as your hair and washing habits. Grow Naturals 60-gram shampoo bars last for up to 60–90 washes.
How do you store a shampoo bar?
Let it dry in a well-ventilated place between uses and avoid leaving it in water. This helps the bar last significantly longer.
Can you use a shampoo bar on colored hair?
Yes, but just like with liquid shampoo, you should look at which product you choose. A mild cleansing base and a pH suited for hair are particularly interesting for treated hair.
Are shampoo bars suitable for all hair types?
There are shampoo bars for most hair types, but not all bars suit everyone. Choose based on your hair's needs rather than solely on scent or packaging.
Does the hair need to get used to a shampoo bar?
No, the hair does not need to undergo a "detox" just because a shampoo is solid. If the hair feels different after a switch, it may simply be because the new product cleanses or conditions differently than the product you used before.
How to choose the right shampoo bar
If you only take one thing away from this guide, let it be this:
Don't choose a shampoo bar just because it is a shampoo bar.
Look at what it contains, how it cleanses, and above all, what it is developed for.
If you want more volume and a fuller feel, Rosemary & Caffeine is our first choice.
If you have dry, frizzy, porous, or damaged hair, we recommend Ginger & Lemon.
And if you are primarily looking for an extra mild shampoo bar for a sensitive scalp, Eucalyptus & Tea Tree is developed for just that need.
Shampoo bars have come a long way from just being a plastic-free alternative to bottled shampoo.
When properly developed, a small bar can be a complete, concentrated hair care product.
And that is exactly how we think a modern shampoo bar should be.
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