People are often asking about hair fibres side effects and whether there is any cause for concern. It’s an understandable question and one that shouldn’t be taken lightly, so that’s why Nanogen, the experts in thicker hair, is here to give you all the facts.

Nanogen Keratin Hair Fibres

At Nanogen, our first priority is creating the very best products that are safe to use and provide the best results, every single time. To do this, we employ our own in-house research and development team and a collective of incredible scientists that work together to create our product range to the highest standard and avoid hair fibres side effects.

Not only are we full of fantastic ideas and groundbreaking innovations, Nanogen is also ISO certified, which means we adhere to the highest quality control for cosmetic development and manufacturing standards.

Because of all our processes are in-house - from conception and creation to manufacturing and marketing - we can keep a close eye on the entire process to ensure complete safety and quality in all our products. We don’t use ingredients that could be potentially harmful or damaging.

100% natural keratin

Nanogen’s number one key ingredient in our Keratin Hair Fibres is its namesake: Keratin. This fibrous protein makes up our hair, skin and nails, and we make sure that ours is 100% natural, which hugely reduces the risk of hair fibres side effects. Using 100% natural keratin also helps to greatly reduce the risk of allergies, since it is already a protein present in the body.

Potential hair fibres side effects

As with anything you apply to your body, it’s important to be aware of any side effects before you start using it. And while the risks associated with hair fibres are incredibly low, we know the importance of having all the information in one place. So, keep reading for a rundown of the most talked about hair fibres side effects.

Ammonium chloride

Some leading brands of hair fibres are formulated with ammonium chloride. This non-organic ingredient can be sourced from a number of things and is often added to fertiliser and to add flavour to liquorice. It can also act as a thickening agent to help dyes stick together. Although ammonium chloride has been declared safe to use topically, any chemical can be hazardous if significant amounts enter the body. Potentially, repeated exposure over time may cause ammonia poisoning, which can cause muscle spasms, irregular breathing, irregular heartbeat, irritation and allergies.


Some hair fibres are made from natural cotton sources to create fibres that look much like hair. However, there are a number of allergies associated with cotton which can cause various hair fibres side effects. Allergies to cotton plant tissues or fibres usually appear as dermatitis, a skin inflammation which can cause rashes and can appear on any part of the body even without direct contact to the allergen. A cotton allergy may also cause respiratory problems including asthma or rhinitis.

Solution: If you suffer from a cotton allergy, it’s key that you stay away from cotton-based hair fibres to avoid any side effects, and instead opt for other types, like keratin-based fibres.


One hair fibres side effect that is relevant to almost all brands is allergies associated with dyes. Since all hair fibres are dyed to match our hair colour, they do contain colourants, artificial or natural, that could cause allergic reactions such as irritation and redness.

Solution: To see whether you react to the dyes in hair fibres, its best to do a patch test on a small area of skin 24 hours before you start to use them. This will tell you if you have any itchiness, irritation or redness before you continue. Many hair fibres brands sell a trial size within their range, which is a perfect size to try out the product before you invest.

Hair fibres side effects: Myths

As well as there being some genuine hair fibres side effects to be mindful of, there are also a number of myths circulating the internet about the dangers of using hair fibres. We’re here to debunk them so you can be safe in the knowledge that using hair fibres won’t cause these issues.

Clogged follicles

There’s some scepticism out there that relates to hair fibres clogging follicles and suffocating the hair strand, causing it to fall out. This, however, isn’t the case. In fact, hair fibres are the ideal substitute for products like dry shampoos and styling powders which can actually clog follicles and cause hair fall out. Keratin hair fibres do not clog up the scalp and can be completely removed with an effective cleansing shampoo (for both men and women).

Damagaed Hair

It’s a myth that one hair fibres side effect is that they damage the hair; hair fibres do not harm the hair or scalp, particularly those made with 100% natural keratin. Since they are made from the exact same protein as our hair, they do not cause any damage to it, meaning hair maintains its health and strength regardless of fibres.

They affect hair treatments

Many people think that if they use hair growth treatments such as serums or medication, they cannot use hair fibres too. This simply isn’t true, as hair fibres do not actually interfere with any hair growth treatments, including minoxidil. Because fibres work by attaching to the hair strand and staying there to build thickness, they don’t actually penetrate into the scalp. This means they won’t actually block the action of any hair loss treatment serums you’re using. In fact, hair fibres can be a great addition to your hair growth routine, by concealing thin areas while you wait for the treatment to ‘kick in’.

Hair fibres side effects vs medical hair loss solutions

As we’ve mentioned, there are a couple of real hair fibres side effects to consider before using them. And while they can be serious, they are also incredibly unlikely. It’s also essential to compare them to the side effects of other medical hair loss solutions on offer.

Any medical procedure or treatment can have a plethora of side effects to think about, particularly if it involves going under the knife or on medication. We’ve looked at some of the most talked about treatments available to see how they stack up against hair fibres side effects.

Hair transplant

Hair transplants are seen as the ultimate baldness cure. By harvesting thousands of individual hair follicles and implanting them, one by one, into bald and thinning patches, the procedure can provide amazing results for those looking to tackle hair loss head-on. Literally.

That being said, hair transplants have a lot of side effects to navigate, thanks to its labour-intensive process. Minor ones include bleeding, swelling, itching and an unnatural result, however, patients could also suffer from infection of the follicles known as folliculitis, bruising around the eyes, and scarring. Not only that, but the process can often be painful and a long term life change which may not suit some hair loss sufferers.

minoxidil (Regaine)

Minoxidil is a hair loss medication that has given some promising results in some users. While it can be an effective treatment for hair loss, it’s not without its side effects. Most minoxidil side effects involve scalp irritation, including burning, stinging and redness. In some cases, it can be absorbed through the skin which can cause major problems. If this happens, users could experience dizziness, irregular heartbeat, chest pain, weight gain and difficulty breathing.

Finasteride (Propecia)

Taken as a pill medication, finasteride claims to slow down hair loss and enhance growth. Oral medications can have a wide range of negative side effects since it actually enters the body, however, finasteride has been known for a few particularly unwanted ones. Among other side effects can include loss of libido, impotence, swelling, dizziness, headaches, insomnia and confusion.


After debunking some of the myths, there are a few real hair fibres side effects to consider before choosing whether to use them or not. And while they can happen, it’s important to remember that any severe symptoms are very rare.

It’s also important to weigh up the hair fibres side effects with those associated with medical hair loss treatments. On the whole, using hair fibres is a lot safer and less risky than any medication or surgery for hair loss. It also provides instant thickness and coverage as opposed to the lengthy medical processes… not to mention a pain-free alternative!

If you are still unsure about the potential hair fibres side effects, make sure you consult your doctor before using.

Want some more expert advice on hair fibres side effects? Why not chat to one of our teams via