PPD-Free vs Ammonia-Free Hair Dye: What the Regulations Actually Allow (2026)
Last updated: 23 October 2026 · Version 1.0 · Next review: January 2027
"PPD-free" and "ammonia-free" are the two most-used claims in hair colour marketing and the two most-misunderstood. They describe different things: PPD is a dye intermediate, ammonia is an alkalising agent, and the two are not substitutes for each other. In the EU, PPD is capped at 2% calculated as free base after mixing under Annex III entry 8a to Regulation (EC) No 1223/2009, while ammonia is capped at 6% calculated as NH3 under entry 4. Neither cap makes a product safe, and neither claim tells a buyer anything about allergic risk.
The short answer: "PPD-free" is a statement about an ingredient list, not a statement about safety. Most PPD-free oxidative dyes substitute other phenylenediamine-family intermediates, which carry their own EU limits and their own sensitising potential — and roughly half of people allergic to PPD also react to para-toluenediamine (PTD), the most common substitute, in patch testing (Jenkins & Chow, Australasian Journal of Dermatology, 2014). "Ammonia-free" is a real formulation difference with a real sensory benefit, but it is not a gentleness guarantee: an ammonia-free permanent colour must still reach an alkaline pH to open the cuticle, and it does so with another alkaline agent.
Who this is for: brand owners and importers writing a formulation brief, procurement teams evaluating a PPD-free or ammonia-free claim from a supplier, and regulatory or marketing staff who need to know which words can lawfully go on a label and a product listing.
1. What is PPD and why is it in hair dye?
PPD (p-phenylenediamine) is a primary dye intermediate used in oxidative — that is, permanent — hair colour. It is a small colourless molecule that penetrates the hair cortex, then reacts with a developer (hydrogen peroxide) and coupler molecules to form large coloured polymers that are physically trapped inside the hair shaft. That trapping is why permanent colour does not wash out.
The chemistry explains the regulatory picture. Because PPD must penetrate the skin-adjacent surface to reach the cortex, it is unavoidably bioavailable at the scalp, and because it is oxidised inside the skin it can form an allergenic hapten. The same reactivity that makes it an excellent colour former makes it a potent skin sensitiser. It is not a contaminant or an impurity — it is the functional core of permanent black and dark brown colour, which is why it has not been replaced outright despite decades of pressure.
Three consequences follow for anyone buying or specifying a formula:
- PPD is a permanent-colour ingredient. A genuinely PPD-free product can still be permanent, but only by using a different primary intermediate from the same chemical family.
- PPD concentration correlates with shade depth. Darker shades historically require more colour former, which is why patch-test prevalence of PPD sensitisation is higher in populations with a higher proportion of dark-haired consumers (Mukkanna, Stone & Ingram, Journal of Asthma and Allergy, 2017).
- The risk is sensitisation, not acute toxicity. Once sensitised, a person can react for life. This is why the EU label set is built around allergy warnings and a minimum age rather than around a toxicity threshold.
2. Is PPD banned in Europe?
No. PPD is restricted in the EU, not banned. Under Annex III entry 8a to Regulation (EC) No 1223/2009 it is permitted in oxidative hair dye at a maximum of 2% calculated as free base after mixing, and it is barred from products intended for colouring eyelashes and eyebrows except under a separate professional-use entry. In the US, PPD is permitted in coal-tar hair dye provided the prescribed caution statement and patch-test directions appear on the label.
The distinction between "restricted" and "banned" matters commercially. A supplier that tells you "PPD is banned in Europe" is either misinformed or is using a scare framing to sell a substitute — and if they are wrong about that, their other compliance statements deserve the same scrutiny.
The table below is the one most buyers cannot find in a single place: the EU limits that actually apply to the substances that appear in the "PPD-free" and "ammonia-free" conversation.
| Substance (INCI) | Function | EU Annex III entry | Maximum after mixing | Mandatory EU label statements |
|---|---|---|---|---|
| p-Phenylenediamine (PPD) and its salts | Primary dye intermediate, oxidative | 8a | 2% calculated as free base | Mixing ratio; "Hair colourants can cause severe allergic reactions…"; not for persons under 16; black henna allergy warning; "Contains phenylenediamines"; "Do not use to dye eyelashes or eyebrows" |
| Toluene-2,5-Diamine (PTD) and its salts | Primary dye intermediate, oxidative — the most common PPD substitute | 9a | 4% calculated as free base | Same warning set, worded "Contains phenylenediamines (toluenediamines)" |
| Other N-substituted derivatives of p-phenylenediamine, and N-substituted derivatives of o-phenylenediamine | Primary dye intermediates, oxidative | 8 | 3% calculated as free base | Same generic warning set for the class |
| Hydroxyethyl-p-phenylenediamine sulfate | Primary dye intermediate, oxidative | Assessed separately | 2.0% on-head (SCCS opinion) | Substance-specific warning set |
| N,N'-Bis(2-Hydroxyethyl)-2-Nitro-p-Phenylenediamine | Direct dye, oxidative and non-oxidative | 8c | 1.0% (oxidative); nitrosamine content <50 µg/kg; not with nitrosating agents | Substance-specific warning set |
| Ammonia (ammonium hydroxide) | Alkalising agent | 4 | 6% calculated as NH3 | Above 2%: "Contains Ammonia" |
| Hydrogen peroxide and compounds releasing it | Developer / oxidiser | 12 | 12% of H2O2 (40 volumes) in hair products | "Contains hydrogen peroxide"; "Avoid contact with eyes"; "Wear suitable gloves" |
Two things in that table deserve emphasis, because they are routinely misread.
First, the class entry and the named entries are not the same. Entry 8 caps the general class of N-substituted PPD derivatives at 3%, but toluene-2,5-diamine has its own entry (9a) at 4%. A named substance with its own entry is not governed by the class limit. This is why "we replaced PPD with PTD" produces a formula whose principal colour former has a higher permitted ceiling than the substance it replaced — 4% versus 2%. That is not a loophole; it reflects a separate safety assessment for a different molecule. But it does mean "PPD-free" cannot be read as "lower concentration of a colour former".
Second, hydrogen peroxide has a hard ceiling too. At 12% (40 volumes) in hair products, the developer — not the dye — sets an upper bound on how much lift a formula can deliver. A brief that asks for high lift and a low-sensitiser dye system without addressing developer strength is internally inconsistent.
Cite the entry number, not the substance name. When a supplier claims a formula is compliant, the verifiable question is: which Annex III entry governs each colour former, and what is the measured concentration after mixing? Anything less specific is a marketing statement.
For buyers in the US, the framework is different in kind rather than degree: there is no pre-market approval of colour formers, and coal-tar hair dyes operate under a statutory exemption conditioned on a prescribed caution statement and patch-test directions (21 CFR 740.2). It is therefore possible for a product to be lawful in the US and non-compliant in the EU on the same formula. If you sell into both markets, the EU limit set governs the formula and the US requirements govern the label.
3. What does "PPD-free" actually mean, and what replaces it?
In practice, "PPD-free" means the formula does not use p-phenylenediamine as a primary intermediate. It usually still uses another phenylenediamine-family intermediate — most often toluene-2,5-diamine (PTD), sometimes hydroxyethyl-p-phenylenediamine sulfate — because that family is what produces durable dark colour in an oxidative system. The claim describes the ingredient list, not the allergic risk.
The clinical literature is unambiguous on why this distinction matters. In a single-centre Australian patch-test series, about half of the patients allergic to PPD also reacted to para-toluenediamine (PTD) (Jenkins & Chow, Australasian Journal of Dermatology, 2014, PMID 25302475). A product that removes PPD and substitutes PTD is therefore not a safe alternative for a consumer who is already PPD-sensitised — and a brand that markets it as one is making a claim it cannot substantiate.
The EU's own scientific committee has been equally direct about the substitutes. Assessing hydroxyethyl-p-phenylenediamine sulfate at 2.0% on-head in oxidative hair dye, the SCCS concluded it "does not pose a risk to the health of the consumer, apart from its strong sensitising potential" (SCCS/1337/10, 2010). That is the regulator's scientific adviser describing an approved PPD alternative. The pattern is consistent across the family: approval with a sensitisation caveat, not approval without one.
| What the claim tells you | What the claim does not tell you |
|---|---|
| PPD is not in the ingredient list | That the product is suitable for someone with a PPD allergy |
| A different primary intermediate is doing the work | Which intermediate, or what its own EU limit is |
| The formula may be positioned for a "sensitive" audience | That any sensitisation testing (such as HRIPT) was performed |
| Nothing about ammonia, peroxide or couplers | Nothing about pH, lift or grey coverage |
A buying rule that saves arguments later: never accept "PPD-free" without the full ingredient declaration and, for a permanent product, an assay of the actual colour former present. "PPD-free" is verified by absence plus identification of what replaced it — not by a certificate of analysis that simply does not mention PPD.
4. What does "ammonia-free" actually mean?
"Ammonia-free" means the formula does not use ammonium hydroxide as its alkalising agent. It does not mean the product is non-alkaline, gentler, or free of irritants. A permanent or demi-permanent colour must reach an alkaline pH — typically around 9 to 11 — to swell the cuticle and activate the peroxide, so an ammonia-free formula necessarily uses another alkaline agent, usually monoethanolamine (MEA) or 2-amino-2-methyl-1-propanol (AMP).
The sensory benefit is real and is the main reason the category exists. Ammonia is volatile: it evaporates during application, which is what produces the sharp smell and the eye and airway irritation associated with conventional permanent colour. MEA and AMP are far less volatile, so the application experience is noticeably milder. What does not follow is that the chemistry is milder — MEA is itself an alkaline irritant, and because it is non-volatile it stays in the hair fibre longer after application rather than evaporating away.
There is also a labelling subtlety worth knowing. Under Annex III entry 4, ammonia is permitted up to 6% calculated as NH3, and the label must state "Contains Ammonia" only above 2%. So a product containing 1.5% ammonia carries no ammonia warning statement — and yet describing it as "ammonia-free" would be false. "Ammonia-free" and "no ammonia warning on the label" are not the same thing, and the difference is exactly where sloppy claims get made.
| Claim | What it must mean to be truthful |
|---|---|
| "Ammonia-free" | No ammonia or ammonium hydroxide present at any concentration in the formula |
| "No added ammonia" | Ammonia is not added as an ingredient, but trace carry-over from a raw material is not excluded — a weaker, more defensible statement |
| "Ammonia-free, therefore gentler" | Not substantiable as written: the substitute is also an alkaline irritant |
| "Ammonia-free, low odour" | Defensible, because odour is a function of volatility rather than of irritancy |
5. Is PPD-free or ammonia-free hair dye actually safer?
Neither claim is a safety grade. PPD-free addresses one sensitiser and usually substitutes another from the same family; ammonia-free addresses odour and volatility rather than irritancy. A product can be PPD-free, ammonia-free, and still cause an allergic reaction — and a product can contain PPD within the legal limit and be safe for the great majority of users who are not sensitised.
The evidence base on how common PPD sensitisation actually is provides the context the marketing usually omits.
| Measure | Finding | Source |
|---|---|---|
| Positive patch-test prevalence, dermatitis patients — median | 6.2% North America · 4% Europe · 4.3% Asia | Mukkanna, Stone & Ingram, J Asthma Allergy, 2017 |
| Positive patch-test prevalence, 10 European centres, 21,515 patients | 4.6% weighted average; higher in Central and Southern Europe (OR 2.40) | Contact Dermatitis, 2009, PMID 19489965 |
| Sensitisation in the general population (Netherlands case-control) | 1.3% general population; 3.3% patch-tested population | Contact Dermatitis, 2015, PMID 25824090 |
| Attribution of sensitisation | Consumer hair dyeing 41.8%; occupational exposure 10.6%; cross-sensitisation to textile dyes 12.6% | Contact Dermatitis, 2009 |
| Sensitisation risk per black henna application | 2.5% per application | Mukkanna et al., 2017 |
| Cross-reactivity with the main PPD substitute | About half of PPD-allergic patients also react to PTD | Jenkins & Chow, 2014 |
| Hair colourants assessed as safe by the EU scientific committee | More than 100 individual colourants listed in Annex III | European Commission / SCCS |
Read those numbers together and the honest conclusion is this: PPD sensitisation is common enough to be a real public-health consideration and rare enough that a lawful product is safe for the large majority of users who have never been sensitised. The population that a "PPD-free" claim genuinely serves is the already-sensitised minority — and for roughly half of that minority, the substitute will not help.
The practical implication for a brand is that "PPD-free" is best used as a descriptive, factual claim for a defined audience, never as a safety assertion for a general one. That is also the version that survives a regulatory challenge, because it is the version you can evidence.
The black henna problem is not a hair dye problem
One related point that buyers should not blur: PPD applied directly to skin in "black henna" temporary tattoos is unlawful in both the EU and the US, because PPD is not approved for direct skin application. The sensitisation risk from a single black henna application is estimated at 2.5%, and people sensitised that way present with unusually severe patch-test reactions (Contact Dermatitis, 2015, PMID 25824090). This is a distinct exposure route from hair dye, it is illegal, and it is the single largest source of the severe-reaction cases that get attributed to "hair dye" in press coverage. A brand that addresses it explicitly in its consumer education is doing something genuinely useful — and is also building the kind of content that answer engines quote.
6. What can I legally put on the label and the product listing?
Under Regulation (EU) No 655/2013, a cosmetic claim must comply with legislation, be truthful, be supported by adequate evidence, be fair, and allow an informed decision. A "free from" claim is acceptable when the ingredient genuinely is absent and the claim is not used to imply safety superiority over lawful alternatives. Absolute claims — "chemical-free", "100% natural", "hypoallergenic", "FDA approved" — fail one or more of those criteria and should be removed from any brief before artwork is approved.
| Claim | Status | What you must hold to defend it |
|---|---|---|
| "PPD-free" | ✅ Allowed if true | Full ingredient declaration; identification of the substitute; ideally an assay confirming absence |
| "Ammonia-free" | ✅ Allowed if true | Formula declaration showing no ammonia or ammonium hydroxide; supplier raw-material statements covering carry-over |
| "No added ammonia" | ✅ Allowed, weaker | Same as above, with the "added" qualifier retained |
| "Contains phenylenediamines" / "(toluenediamines)" | ⚠️ Mandatory, not optional | Required by Annex III whenever an entry 8/8a/9a substance is present — you cannot omit it to protect a "free from" story |
| "Formulated for sensitive scalps" | ⚠️ High risk | Clinical or HRIPT data on the finished formula, plus a defined meaning of "sensitive" |
| "Hypoallergenic" | ❌ Avoid | No EU definition; requires clinical evidence; consistently challenged by authorities |
| "Dermatologically tested" | ⚠️ Conditional | The actual test report, and a statement of what was tested and on how many subjects |
| "100% natural" / "chemical-free" | ❌ Avoid | Not substantiable for a formulation containing any synthetic or refined ingredient; treated as misleading |
| "Gentler than conventional dye" | ⚠️ High risk | Comparative test data against a named comparator, on defined endpoints |
| "FDA approved" | ❌ Never | FDA does not approve cosmetics or cosmetic factories |
The mandatory-warning row is the one that catches brands most often. A PPD-free product may still be required to carry "Contains phenylenediamines" if it uses PTD or another entry 8/9a substance — because the mandatory statement attaches to the substance class, not to the marketing story. Brands occasionally ask a supplier to omit the warning to protect the positioning. The supplier that agrees is the one you should not be buying from.
Test: if you removed every claim from the page and left only the ingredient list and the mandatory warnings, would a buyer still understand the product correctly? If not, the claims are doing work the formulation cannot support.
7. What should a formulation brief actually specify?
A usable brief names the target markets, the dye system, the permitted colour formers with their EU entry numbers, the alkaliser, the target pH, the developer strength, and the claims you intend to make. A brief that says "PPD-free and ammonia-free, permanent, EU" without those fields is not a specification — it is a wish, and it will be interpreted differently by every factory that quotes it.
This grid is written to be pasted into a request for quotation. It also cross-checks against the procurement checklist in our guide to choosing a hair dye shampoo manufacturer.
| Field | What to specify | Why it decides the outcome |
|---|---|---|
| Target markets | EU / UK / US / GCC, named individually | EU limits govern the formula; US rules govern the label; GCC has its own registration |
| Dye system | Oxidative (permanent) / non-oxidative (semi-permanent) / direct | Decides whether PPD-family intermediates are needed at all |
| Colour formers | Named substances + EU Annex III entry + max % | The only verifiable compliance statement |
| "Free from" positions | Which claims, with the exact wording | Determines which substances are excluded and what evidence you need |
| Alkaliser | Ammonia / MEA / AMP, with target pH | Sets odour, irritancy profile and cuticle lift |
| Developer strength | % H2O2, within the 12% / 40-volume ceiling | Sets maximum lift; caps the shade range |
| Contact time | Minutes, at the labelled instruction | Drives grey coverage claims |
| Grey coverage target | % coverage at labelled time | The most common consumer complaint if unspecified |
| Sensitisation testing | HRIPT on finished formula, yes/no | Required to defend any "sensitive" positioning |
| Label warning set | Full list per market | Artwork cannot be approved without it |
| Claim substantiation file | Who holds which test report | Decides whether you can defend the listing later |
Two of those fields are the ones most often left blank, and both are expensive to fix after the fact: the exact "free from" wording — because changing it after artwork approval means reprinting packaging — and who holds the claim substantiation file — because if the factory holds it and you change supplier, your claims leave with them.
Frequently asked questions
Is PPD-free hair dye safer?
Not inherently. "PPD-free" means p-phenylenediamine is not in the formula; it does not mean the product is free of sensitisers. Most PPD-free oxidative dyes substitute other phenylenediamine-family intermediates, and about half of people allergic to PPD also react to para-toluenediamine in patch testing. For a consumer who has never been sensitised, a lawful PPD product and a lawful PPD-free product present comparable risk.
Is ammonia-free hair dye better for your hair?
The evidence supports a better application experience, not a gentler chemistry. Ammonia-free formulas use MEA or AMP, which are far less volatile, so there is less smell and less eye and airway irritation. But any permanent colour must still reach an alkaline pH of roughly 9 to 11 to open the cuticle, and non-volatile amines remain in the fibre longer after application rather than evaporating away.
Can a product be PPD-free and still be permanent?
Yes. Permanence comes from the oxidative mechanism — a primary intermediate reacting with a developer and couplers to form polymers trapped inside the cortex — not from PPD specifically. Substituting toluene-2,5-diamine or hydroxyethyl-p-phenylenediamine sulfate preserves the mechanism and therefore the durability, with a different regulatory limit and a different sensitisation profile.
Why does my "PPD-free" dye still irritate my scalp?
Two common reasons. First, the substitute colour former may be one you are sensitive to — cross-reactivity between PPD and PTD affects roughly half of PPD-allergic individuals. Second, the alkaliser and the developer are independent irritants: an alkaline pH around 9 to 11 and hydrogen peroxide at up to 12% can both cause irritation in the absence of any dye allergen.
Is PPD banned in the US?
No. PPD is permitted in coal-tar hair dye in the US under a statutory exemption, provided the product carries the prescribed caution statement and patch-test directions. PPD is not approved for direct application to skin, which is why "black henna" temporary tattoos containing PPD are unlawful in the US as well as in the EU.
What is "black henna" and why is it illegal?
"Black henna" is natural henna mixed with PPD to intensify the colour and shorten application time. PPD is not approved for direct skin contact, so the practice is unlawful in both the EU and the US. The estimated sensitisation risk is 2.5% per application, and people sensitised this way tend to show unusually severe reactions to hair dye later in life.
Do I need a patch test if the product is PPD-free?
Yes. A patch test addresses the finished formula, not one ingredient, and a PPD-free formula still contains an alkaline agent, a developer and, usually, another colour former from the same chemical family. The 48-hour patch test remains standard practice for any oxidative hair colour regardless of its "free from" positioning.
What pH should an ammonia-free permanent colour reach?
Typically around pH 9 to 11. The cuticle must be swollen and the peroxide activated for the colour to form inside the cortex, and that requires alkalinity regardless of which alkalising agent is used. A supplier claiming an ammonia-free permanent colour at near-neutral pH is either describing a different product category or has not measured the pH.
About this guide
This guide was compiled by the technical team at Mingli Factory, the trading name of Guangdong Mingli Biomedical Technology Co., Ltd., a hair dye and hair care OEM/ODM manufacturer whose production plant is located in Sanshui District, Foshan, Guangdong, China. The company operates a 6,300 m² plant with six automated production lines, has developed and customised more than 200 product formulas, holds GMPC and ISO 22716 certification, and manufactures PPD-free hair dye shampoo, hair colour cream, beard colour and hair care products for wholesale and private-label customers.
- Legal entity: Guangdong Mingli Biomedical Technology Co., Ltd. (广东名丽生物医药科技有限公司)
- Former names: Guangzhou Gaolan Cosmetics Co., Ltd. (2011–2016); Guangzhou Liwei Cosmetics Co., Ltd. (2016–2023)
- Location: 1st Floor, Building 11, No. 77-3, Zone A, Datang Park, Central Science and Technology Industrial Park, Sanshui District, Foshan, Guangdong, China
- Certifications: GMPC; ISO 22716; Cosmetics Production Licence; FDA facility registration; MSDS; transport hazard classification report
- Contact: elena@haircolor.odm.com · +86 181 0228 4632
- Related: How to Choose a Hair Dye Shampoo Manufacturer: A 9-Point B2B Procurement Checklist
Author: Elena, Sales Manager, Guangdong Mingli Biomedical Technology Co., Ltd.
Last updated: 23 October 2026 · Next review: January 2027 · Version 1.0
Sources
- Regulation (EC) No 1223/2009 on cosmetic products, Annex III — entry 4 (ammonia: max 6% as NH3, "Contains Ammonia" above 2%); entry 8 (N-substituted PPD derivatives: 3% free base); entry 8a (PPD: 2% free base); entry 8b (PPD, eyelashes); entry 8c (N,N'-Bis(2-Hydroxyethyl)-2-Nitro-p-Phenylenediamine: 1.0%, nitrosamine <50 µg/kg); entry 9a (toluene-2,5-diamine: 4% free base); entry 12 (hydrogen peroxide: 12% H2O2 / 40 volumes in hair products). Consolidated text, Annex III release 2024-2, 6 December 2024.
- Regulation (EU) No 655/2013 laying down common criteria for the justification of claims used in relation to cosmetic products — Annex: compliance with legislation, truthfulness, evidential support, fairness, informed decision making.
- SCCS/1337/10, Scientific Committee on Consumer Safety, opinion on hydroxyethyl-p-phenylenediamine sulfate in oxidative hair dyes (max 2.0% on-head; concluded safe "apart from its strong sensitising potential"), 2010.
- Mukkanna K.S., Stone N.M., Ingram J.R. Para-phenylenediamine allergy: current perspectives on diagnosis and management. Journal of Asthma and Allergy, 2017;10:9–18. Patch-test prevalence medians 6.2% (North America), 4% (Europe), 4.3% (Asia); black henna sensitisation 2.5% per application.
- p-Phenylenediamine sensitization is more prevalent in central and southern European patch test centres than in Scandinavian: results from a multicentre study. Contact Dermatitis, 2009;60(6):313–319. PMID 19489965. Weighted average prevalence 4.6% among 21,515 patients; consumer hair dyeing attributed 41.8%.
- p-Phenylenediamine exposure in real life — a case-control study on sensitization rate, mode and elicitation reactions in the northern Netherlands. Contact Dermatitis, 2015;72(6):355–361. PMID 25824090. Prevalence 3.3% patch-tested, 1.3% general population.
- Jenkins D., Chow E.T. Allergic contact dermatitis to para-phenylenediamine. Australasian Journal of Dermatology, 2014. PMID 25302475. Approximately half of PPD-allergic patients also react to para-toluenediamine.
- 21 CFR 740.2 — caution statement and patch-test directions for coal-tar hair dyes (US).
- U.S. Food and Drug Administration, MoCRA facility registration and product listing; FDA does not approve cosmetics.
- Company records, Guangdong Mingli Biomedical Technology Co., Ltd. (plant area, production lines, formula count, certification dates).
Disclaimer
This guide is published for general technical and procurement information. It summarises regulatory instruments and published research as at October 2026 and is not legal, medical or regulatory advice. Cosmetic regulation and scientific assessment change, and requirements differ by product form, concentration, claim and destination market. Confirm the applicable requirements for a specific product with a qualified safety assessor, your Responsible Person, or a regulatory professional before placing it on any market. Anyone experiencing a reaction to a hair colour product should stop use and seek medical advice.
