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The Best Hair Conditioner Bars In The UK 2021

September 26, 2021 8 min read 2 Comments

Girl with full red hair

The Perfect Natural Hair Bar Conditioners

NewsUpdate - Our 2 in 1 Orange Shampoo/Conditioner Bars were entered into the Top Santé Haircare Awards 2021 in the Best Everyday Shampoo and Conditioner category and were voted  *** Silver Award Winner! ***


2 in 1 Shampoo Conditioner Bar - Frankincense


We’ve taken a closer look at shampoo bars so now let’s look at The Solid Bar Company's amazing natural conditioner bars.

Don't forget to note, that like all our products, these best solid natural conditioners are not only created with variants for all hair types, they are all plant-based and, as they are plastic-free, they are delivered to you without plastic bottles so are 100% plastic free!. 

When it comes to a natural hair care regime, the essentials to always use are natural shampoo bars and a natural conditioner bars! The all-natural shampoo comes first but that does not mean forget about conditioning with natural hair conditioner bars.

To start with, let us do a little background to inform you of what should be in the best natural UK hair bar conditioners, why those ingredients are there, and what they will do for your hair - and you! 

Did you know that most well-known liquid conditioners on the market contain 80%+ water?

Our hair conditioner bars UK are not bulked out with water to try to fool you into thinking that you are getting more conditioner for your money. They contain no water at all, just top-of-the-range high-grade salon standard ingredients, so they leave your hair feeling and looking silky smooth and tangle-free - and they are shipped to you all packed up in plastic either!

Conditioner bars from award-winning 'The Solid Bar Company' are a breakthrough and, better still for your carbon-footprint, all our solid shampoo and conditioner bars are hand-made in the UK!

These rich, creamy, plastic-free, zero-waste, solid conditioner bars are packed full of concentrated conditioning ingredients making it easy for you to switch from plastic bottles, leaving your hair soft, shiny, and smooth.

Get the results you expect from bottled products from day one but with the bonus of no plastic, no water, and no compromise on results!

Excellent value for money

So how do proper natural hair conditioners work?

Well - and forgive a little bit of science here - our hair and skin are negatively charged (anionic), so for the best conditioner to work its magic on our hair, it needs to be positively charged (cationic). The only way it can do this is to use positively charged ingredients and other ingredients that assist the positively charged ingredients in doing their stuff.

BTMS-50 (which contains 50% active Oil Behentrimonium Methosulfate) is 100%vegan, and the largest ingredient in our bar is a positively charged (cationic) compound derived from the natural oil of the Colza plant (shown below) and is known to be one of the best detangling ingredients in the world. 

Colza plant

This amazing ingredient, BTMS, can ‘adsorb’ to the surface of the hair (adsorption is when the molecules sit on top of the hair, as opposed to absorb or penetrate the hair) in a process called ‘substantivity’.

Just like a magnet, this positively charged cationic quaternary compound (BTMS) is attracted to our hair and coats our negatively charged hair fibres.

When hair is damaged or chemically treated, it has a higher pH and higher negative charge. This is due to an increase in cysteic acid that forms when the disulphide bonds in the hair are broken and not reformed. However, the positively charged conditioning agent will be more attracted to your hair and is going to adsorb more.

As BTMS is hydrophobic (a bit like cats!), it will resist removal by water alone - so thankfully it won’t wash off when you rinse your hair after applying it in the shower but it will wash off when you next shampoo your hair.


Why is it important that hair conditioners be attracted to your hair?

Well, by adsorbing to our hair in this way, the best conditioner bar enables the hair cuticle to lay flat. This makes our hair silky, smooth, and lustrous with the ability to hold a style. It reduces the force required to brush or comb the hair resulting in less tangling, fewer broken hairs, and less static electricity on the surface whilst simultaneously increasing softness and shine.

Static electricity on hair

The aim of any conditioning product should be to maximise the adsorption and substantivity of positively charged ingredients so it can impart these numerous benefits to us, resulting in the type of hair we want - strong, lustrous and healthy!

Most conditioner bars on the market with BTMS tend to use BTMS-25 (25% active Oil Behentrimonium Methosulfate only) which is far more widely available and less than half the price of BTMS-50, though nowhere near as effective.

Not only do we use BTMS-50 but also we are supplied this without the petroleum ingredient Butylene glycol and are therefore able to add Propanediol (corn-based) ingredient instead, resulting in a far more eco-friendly natural hair conditioners. The remaining ingredient is plant-derived Cetearyl alcohol, a fatty acid that further enhances the adsorption process. 

We also include Cetrimonium Chloride, another cationic compound that prevents static in and ‘build-up’ in hair (residue left on hair primarily from styling products).

Hair being styled and conditioned

To further increase this adsorption process of these natural hair conditioners we have included another fatty alcohol, plant-derived Cetyl Alcohol, which also encourages more adsorption of BTMS.

You will also find we include vital hydrolysed cationic plant-based proteins, such as vegan Oat protein and Vegetable Keratin, also known as, ‘non-occlusive film formers’ as these have a similar proteinaceous structure to our hair and skin and therefore easily and naturally adsorbed by them.

Another wonderful film former ingredient for our hair is D-L panthenol (pro-vitamin B5). This makes our hair shine without oil or greasiness.

Panthenol is also able to penetrate the hair cuticle and bring moisture to the cortex, enabling good manageability and pliability of the hair as well as giving it more body. Studies have also shown that if left on our hair for just two minutes before rinsing, it can swell the hair shaft, making it appear thicker thereby helping to add that extra body many seek! Now you are beginning to understand how we have created the best natural conditioners in the UK.

Full bodied hair

Silicons such as Dimethicone and Cyclomethicone are found in many hair and skincare products, though they’re not eco-friendly because they are not biodegradable.

However, because of this we extended our research to find silicon alternatives that are derived from plant-based, readily biodegradable ingredients and are eco-certified. They offer incredible slip and shine to hair even whilst wet and are excellent additional ingredients for our solid hair conditioners.

Further moisture is added to the cationic ingredients and film-formers through a small number of butters and oils, such as Shea butter, Cocoa butter, Apricot Kernel Oil, Almond, and Argan oil, all of which will coat the hair strands to increase lubrication and moisturisation. Again, a big plus for these solid conditioner bars UK.

In our oily bars, we switch Shea and Cocoa Butter for a light Orange butter, which acts as a good cleanser for oily hair, due to its high limonene content.



Butters and oils alone won’t add any conditioning properties to our hair as they are non-ionic (neutral) rather than cationic and therefore not ‘substantive’, yet there are several solid conditioner bars on the market that rely on oils and butters as their main conditioning ingredients alone, which simply won’t cut it.

This is the same for apple-cider vinegar. Popular for those using traditional, alkaline ‘soap’ bars (studies are now showing they may cause long-term hair damage, due to the naturally high pH of soap bars) or bicarbonate of soda as a ‘shampoo; and vinegar as an acidic ‘conditioner’ after-rinse.

Cider vinegar

However, vinegar is also a non-ionic ingredient and will therefore not adsorb to your hair strands and so by definition is not able to reduce the combing forces and friction to your hair. Something you need to be aware of when looking after your hair naturally.

Many of the ingredients we use from BTMS-50 to panthenol, Shea butter, proteins, and silicon alternatives are also important ingredients in skincare products, giving the skin a powdery feel, as well as adding moisture and glide. That is why our natural conditioner bars can double up as well as a shave bar for both men and women!

You can check out the details of all our skin-safe natural product ingredients here!

Man hair

Unfortunately, many conditioner bars on the market (and traditional liquid conditioners) have very little to no cationic ingredients, using large quantities of butter and oils, which as we know will moisturise but not condition your hair and in some cases can leave it heavy and limp.

There are also conditioners containing a large amount of petroleum-based ingredients which the hair absorbs, with synthetic fragrances, and even harsh, sulphate-based ingredients such as Sodium Lauryl Sulphate which is not only irritating to the skin but is anionic (negatively charged), so strip and wash rather than condition the hair.

With skin conditions such as dermatitis, psoriasis, and eczema on the increase, it is important to use gentle products on both our skin and scalp, which is also why would do not use any ‘fragrance’, as this is synthetically produced and can be a harsh irritant for many people.

So instead we opt for natural, plant-based essential oils for both their amazing scents and therapeutic benefits.

We have four wonderful blended scents for these zero-waste award winning natural conditioner bars, including ‘Botanical’ (with relaxing Lavandula Angustifolia Lavender and Geranium), 6 oil ‘Herbal’ blend (with refreshing Spearmint, Rosemary and Lime), Woodland (including calming Vetiver and Patchouli), and organic Sweet Orange, which has a cheerful and uplifting scent.

Girl in lavender field

To fully complement your hair type we have created ingredients specifically to suit either a normal/dry hair conditioner variant or an oily hair conditioner variant - so you can choose the natural conditioner bar that best suits your hair!

Each of the large natural hair conditioners will last 35-50 washes with our smaller conditioner bars lasting 20-30 washes. The Solid Bar Company plastic-free conditioner bars are easy to apply, and fast to work, giving you that instant detangled, smooth feeling, just like a bottled conditioner. You stroke the bar down your hair between your palms from root to tip. If you have short hair just stroke it directly over your head on your hair.

The Solid Bar Company plant-based conditioner bars are available for all hair types. We have coloured hair conditioner bars and highlighted hair conditioner bars, normal to dry hair conditioner bars, normal to oily hair conditioner bars, and grey hair conditioner bars.

Other points worth noting are that these solid conditioner bars are made in the UK from the finest ingredients so they will help restore your damaged hair - plus they are vegan, cruelty-free, paraben-free, silicone-free, sustainable, biodegradable, and never tested on animals!

It's time for you to discover our range of hand-made natural conditioner bars all made with eco, vegan, cruelty free, palm oil free and natural ingredients that are all eco-friendly. All our natural conditioner bars are supplied in zero waste, plastic-free packaging that can be recycled.

Making the switch from commercial to natural is easy and if you have already made the switch to a natural vegan shampoo bar, why wait? Natural conditioner bars are great, perfect for restoring and maintaining healthy, natural hair.

When it comes to a natural hair care regime the natural essentials are definitely a natural shampoo and a natural conditioner bar! Natural shampoo comes first but that doesn't mean forget about conditioning with a natural conditioner bar.

What's great about a natural conditioner bar is convenience! They are a handy size and also very minimalist. Most commercial conditioners are large and chunky, cluttering your bathroom with unsightly plastic.

Our natural conditioner bars however are 100% plastic free, sustainable, natural and zero waste! It doesn't get any better than that!

Give your hair a real treat and try one out today, conditioner bars are easy to use, you will not look back and your hair will thank you forever - no more liquid conditioner!

The complementary natural shampoo bar you use is also is just as vital and important to have great hair, so don't forget to also check out our easy and informative guide on shampoo bars here,  5 Great Tips To Help You Find The Best Shampoo Bar in 2021!


Best wishes for better hair,

Rebecca and The Solid Bar Company Team 


(This article was last updated 15th November 2021) 

2 Responses

Rebecca - The Solid Bar Company CEO
Rebecca - The Solid Bar Company CEO

October 15, 2019

Hello Elahe,

Thanks for your question! I have coloured hair too. Any of the bars you choose will work for coloured hair, they just differ in scent and you just then choose between ‘normal/dry’ and ‘oily’. The shampoo bars are made using gentle surfactants and the salons that use our bars say it’s fine on their customers with coloured hair too. The same goes for the conditioner bars. Hope that helps answer your question!

Thanks and regards

Elahe Taylor
Elahe Taylor

October 15, 2019

I am looking for a shampoo and conditioner bar sympathetic to my colored hair.
I use Naturtint hair colour and I like to reduce use of plastic containers by using shampoo and and conditioner bars
I have read through your article on the solid shampoo company and I welcome your guidance in choosing the right bar for me. I live in AL8 6RT area.

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