Is Ammonia Harmful For Hair?

We all love hair colors, from deep burgundy and rich auburn to chocolate brown and champagne, there are countless stylish hair color choices available today! You can confidently choose to dye your hair lavender, sea blue, or even pink without hesitation, especially since everyone around you is showcasing trendy shades.

The joy of having a hair color that suits your personality is unparalleled, its something we all want to experience once in our life, some more than just once. But, when you read about coloring your hair online, there is a huge community that warns you about the dangers of getting colored hair and how difficult it is to maintain it. Then, you read about the ingredients, and you start going through a rabbit hole about different ingredients and the toxins inside them.

If you’ve ever sat in a salon chair and felt that sharp, stinging scent hit the back of your throat, you’ve met ammonia. While it’s a staple in the world of permanent hair color, it’s also one of the most debated chemicals in the beauty industry.

In this article, let’s dive deep into ammonia in hair color dyes, and whether they are truly as harmful as suggested by users on reddit and other public forums.

Ammonia In Hair Color

In simple words, Ammonia is the reason your hair color shows up on your hair. Without ammonia (or a chemical substitute), the dye would simply sit on top of the hair and wash away in a single shower.

Think of your hair strand like a pinecone. The “scales” on the outside are the cuticle, a protective layer that keeps moisture in and foreign objects out. Underneath that lies the cortex, where your natural pigment lives.

Ammonia serves one aggressive purpose: it is an alkalizing agent. Because it has a high pH, it forces those cuticle scales to swell and lift open. Once the “door” is open, the hair dye can penetrate deep into the cortex to strip your natural color and deposit new pigment.

This process is analogous to unlocking a door, enabling the hair dye to penetrate deep into the cortex where it can work its magic. Once the “door” is open, the hair dye can strip away your natural hair color, altering it in the process, and depositing new artificial pigments that adhere to the hair fibers.

Without the presence of ammonia or a suitable chemical substitute, hair dye lacks the ability to penetrate deeply into the cortex. Instead, the product remains on the surface of the hair, which usually results in a fleeting effect, the color would wash away with just a single shower, rendering the dye ineffective.

This is why the inclusion of ammonia is crucial in many traditional hair coloring processes, as it ensures durable and long-lasting results.

Why Is Ammonia in Hair Dyes

Ammonia is a compound that contains nitrogen and hydrogen, with the chemical formula NH₃. In the context of hair coloring, ammonia serves a crucial role as an alkaline agent.

When used in hair dyes, it works by increasing the pH level of the hair. This increase in pH is essential because, under alkaline conditions, the cuticle, the outer protective layer of the hair, begins to swell and lift. This lifting action is vital because it allows the hair color or dye to penetrate deeply into the cortex, which is the inner portion of the hair where the actual color change occurs.

Ammonia swells the hair cuticle, allowing dye molecules to bond firmly to the hair shaft for vibrant, long-lasting color with reduced fading. Higher the absorption of the hair color during this process, the longer the dye is likely to stay in the hair without fading.

This is particularly important for individuals who want a long-lasting hair color and are looking for a product that will withstand washing and exposure to environmental factors.

Dangers of Ammonia in Hair Dyes

Ammonia isn’t just “strong”; it’s corrosive. Because it’s a volatile gas, it enters your body through both skin absorption and inhalation.

The use of ammonia in hair dye is not without controversy. While it is effective, ammonia can also be harsh and may cause damage to the hair if not used correctly. It can strip the hair of its natural moisture and shine, leading to dryness and brittleness.

Ammonium Hydroxide Formation:
When ammonia dissolves in water, it forms ammonium hydroxide, which can irritate the skin and eyes.

Contact with ammonium hydroxide can cause burns and irritation, leading to discomfort and potential long-term damage. When it comes in contact with the skin, it can lead to severe skin burns, as well as irritation of sensitive areas such as the nose and eyes. This can result in discomfort, redness, and potential long-term damage if not treated promptly.

Impact on Hair
Repeated use of ammonia-based hair dyes can damage the hair cuticle, resulting in frizzy, dry, and brittle hair.

Ammonia-based dyes are popular for their effectiveness in penetrating the hair shaft to deliver color. However, repeated use of these ammonia dyes can lead to significant damage to the hair cuticle.

Health Risks for Salon Professionals:
Ammonia vapors can enter the bloodstream through the scalp and pose health risks, including respiratory and eye infections.

This poses health risks not only to individuals undergoing hair treatments but also to salon professionals frequently exposed to ammonia vapors during dyeing procedures. Such exposure can lead to various health issues, including respiratory problems, sinusitis, throat infections, and eye infections, which may require medical attention.

Effect on Tyrosine
Ammonia destroys tyrosine, an amino acid essential for melanin production, affecting the hair’s ability to hold color.

Beyond personal health and hair care implications, ammonia’s environmental impact cannot be overlooked. When released into the ecosystem, ammonia can cause significant damage to crops and forests, affecting agriculture and natural habitats.

Additionally, when rainwater washes ammonia into bodies of water, it can pose a danger to aquatic species, disrupting delicate ecosystems. The molecules of ammonia are small and evaporate quickly, which can lead to a lingering pungent smell that can be unpleasant and indicative of environmental contamination.

Do All Hair Dyes Contain Ammonia

In the past, ammonia dyes were the sole choice for darkening hair.

However, nowadays, there are various ammonia-free hair color options available. Although ammonia-based hair dyes can provide long-lasting results (which is why they are referred to as permanent dyes), ammonia-free alternatives are milder on both hair and skin. If you have a particularly sensitive scalp, you might consider using organic hair colors.

The industry has pivoted significantly toward ammonia-free alternatives. However, you need to read the fine print.

Semi-Permanent/Demi-Permanent: These usually contain no ammonia. They coat the hair or stain the outer layer rather than forcing their way into the core.

Ammonia-Free Permanent Color: These brands use substitutes like MEA (Monoethanolamine). While MEA doesn’t have the harsh smell of ammonia, it is a larger molecule that can sometimes stay trapped in the hair, causing its own brand of slow-burn damage if not rinsed properly.

Henna and Vegetable Dyes: Henna is among few naturally available hair dyes that are truly ammonia-free and non-toxic, but they cannot “lighten” your hair, they can only add color on top. They can also be prepared at home without professional hair salon assistance.

Not All Hair Dyes Are Unsafe

It’s important to recognize that hair dyes vary in their safety, particularly between permanent and natural options.

Permanent hair dyes often contain oxidative agents that result in long-lasting alterations to hair structure. Key components typically include ammonia, hydrogen peroxide, and p-phenylenediamine (PPD). Ammonia facilitates color penetration by opening the hair cuticle, but it can also irritate the scalp and lead to damage.

Hydrogen peroxide acts to lighten hair and aid in dye bonding, though it may also result in brittleness and dryness. PPD, commonly found in darker hues, is a recognized allergen that can provoke serious allergic reactions in certain people.

Research has shown that darker permanent dyes may present a greater risk of health complications, including possible carcinogenic effects, especially for regular users prior to 1980, when formulas contained more harmful substances.

Alternatives To Ammonia

Point to note: When a hair dye removes ammonia, it needs to replace it with another alkalizer to effectively change the hair’s structure while keeping it healthy. The main goal is to raise the hair’s pH level enough to swell the cuticle, allowing the dye to penetrate deeply for a vibrant color.

Most professional and box-dye brands use Ethanolamines, especially Monoethanolamine (MEA). MEA is popular because it doesn’t have the harsh smell that ammonia does, making the dyeing process more pleasant.

Some brands also use alternatives like Sodium Carbonate or Aminomethyl Propanol (AMP). While these options are less pungent than ammonia, they are still strong chemicals designed to alter your hair’s natural structure.

They aim to provide a gentler experience, especially for those sensitive to strong odors, but it’s important to remember that they can still impact your hair’s health in the long run.

If you are not sure about it, you can always look for homemade DIY hair mask recipes for your hair.

What Do Ammonia-Free Dyes Contain

To make up for the absence of ammonia, these dyes typically utilize an alternative delivery system, generally oil.

Oil Delivery Systems (ODS): Numerous premium ammonia-free color products (such as L’Oréal Professionnel INOA) employ a high level of oil to help transport color pigments into the hair shaft. This method is considerably milder than the ammonia-based “gas-explosion” technique.

MEA (Monoethanolamine): This is the liquid compound that substitutes ammonia gas.

Emollients: These formulations frequently contain increased amounts of argan oil, aloe vera, or keratin to calm the scalp and help seal the cuticle back down following the coloring process.

What Is Ethanolamine & Is It Dangerous?

Ethanolamine is a thick, colorless liquid. Unlike ammonia, which is a quickly evaporating gas (hence its strong odor), MEA is a dense liquid that remains on the hair and skin until it is washed off.

Ethanolamine is regarded as a potential hazardous substance. Consult with a dermatologist or your hairstylist before you choose a hair dye. [Source: nj.gov]

Is it dangerous?
In short: It is generally viewed as “safer” for your respiratory system, but not necessarily “better” for hair health.

Lower Volatility: Since it doesn’t vaporize, there’s no risk of inhalation. This makes it preferable for stylists and clients with asthma or sensitive sinuses.

Scalp Irritation: Although it has a more pleasant scent, MEA is still a chemical. If not thoroughly rinsed out, it can linger on the scalp and lead to “creeping” irritation or even hair thinning over time due to elevated pH levels.

Hair Health: Due to the larger size of MEA molecules compared to ammonia, they may not easily escape the hair. If a stylist isn’t cautious, MEA can cause the hair to remain in a slightly expanded state, resulting in a “mushy” texture after multiple treatments.

Toxicity: Regarding systemic toxicity, MEA is heavily monitored. It is regarded as safe for cosmetic use in limited amounts, but similar to ammonia, it can provoke skin sensitization.

Is Going Ammonia-Free A Better Option For Your Hair?

For the vast majority of people, the answer is a yes. Moving away from ammonia is a massive win for your long-term health and the structural integrity of your hair. However, “better” depends on whether you value immediate chemical power or long-term hair vitality.

It’s important to understand that all hair dyes can potentially damage your hair to varying degrees. The frequency of dyeing can impact the appearance, texture, and behavior of your hair. Selecting the ideal at-home hair color depends on your concern regarding ammonia’s effects on hair and the intensity of the color.

Shift To Natural Ammonia-Free Hair Dyes For Your Hair

If you are staring at silver strands in the mirror, your first instinct might be to reach for the strongest “fix” available. But covering gray hair doesn’t have to mean compromising your health or your hair’s structural integrity.

Gray hair is uniquely stubborn because it lacks melanin and often has a thicker, more tightly packed cuticle. While ammonia-based dyes “blast” these cuticles open, natural ammonia-free dyes use a more sophisticated, nourishing approach to achieve total coverage.

Why Gray Hair Needs a Different Approach

Gray hair isn’t just a different color; it’s a different texture. It is often “wirier” and more water-resistant (hydrophobic) than pigmented hair.

Ammonia’s Flaw: It can leave gray hair looking “flat” or “translucent” because it strips away too much of the hair’s natural protein while trying to force color in.

Natural-based dyes often use essential oils and plant-derived lipids to soften the coarse gray cuticle first. This allows the pigment to slip inside without the chemical trauma, resulting in a multi-dimensional look rather than a solid “helmet” of color.

For those committed to a 100% plant-based lifestyle, a two-step process of Henna (Lawsonia inermis) and Indigo (Indigofera tinctoria) can cover even the most resistant grays.When shopping for natural-leaning gray coverage, look for these “Good Guys” that help manage the wiry texture of aging hair:

Vegetable Glycerin: A humectant that pulls moisture into dry, brittle grays.

Oleic Acid: Found in olive oil, it helps soften the hair cuticle for better dye penetration.

Soy or Wheat Proteins: These “fill in” the gaps in aging hair, making the strand feel thicker and stronger.

Ultimately, ammonia is a powerful tool that comes with a high biological price. While it remains the gold standard for dramatic color shifts, its corrosive nature inevitably compromises the structural integrity of your hair and poses risks to your respiratory health.

Transitioning to ammonia-free, oil-based, or natural alternatives isn’t just a trend, it’s a commitment to long-term hair vitality and scalp safety. By choosing gentler chemistry, you swap the harsh “blast” of ammonia for a nourishing process that covers grays and deposits pigment without the toxic fumes.

Your hair is an investment; don’t let it go up in smoke.