Prohibition
The material must not be used at all.
IFRA Standards
The safety limits behind every perfume.
The IFRA Standards are the fragrance industry's rules for the safe use of fragrance materials, published by the International Fragrance Association. Each Standard bans a material, limits how much of it a product may contain, or sets conditions on its quality, and the limits are set separately for each type of product.
- Amendment 51 in use
- Fine fragrance: Category 4
- Limits on the finished product
Three kinds of Standard
What an IFRA Standard can do
Every Standard takes one of three forms. Together they are what IFRA calls a risk management system for the safe use of fragrance ingredients.
Restriction
A maximum level of the material in the finished product, set for each product category.
Specification
Conditions on the type or quality of the material, such as its purity.
At a glance
The facts, in one table
| Question | Answer |
|---|---|
| Who publishes them | The International Fragrance Association (IFRA), at ifrafragrance.org. |
| Who must follow them | IFRA members are required to. In practice responsible manufacturers and retailers expect them. |
| How they change | In numbered amendments. The 51st Amendment was notified on 30 June 2023 and is the one in use today. |
| What is next | A 52nd Amendment; IFRA expects to notify it in January 2027. |
| Fine fragrance | Eau de parfum, eau de toilette, parfum and cologne sit in Category 4. |
| Where the numbers are | In the Standards themselves and on each supplier's IFRA certificate for a material. |
How limits work
Three things most beginners miss
Limits are per category
Exposure differs between a perfume left on skin and a soap rinsed off, so a material can have different limits in different product categories. Fine fragrance is Category 4.
Limits apply to the finished product
The limit is a share of the finished, diluted perfume, not of your concentrate. Dilute a concentrate to 20 percent and a material limited to 1 percent may make up at most 5 percent of the concentrate.
Natural oils count too
A natural oil can be restricted because of a component it contains. Citrus oils and oakmoss are the examples home perfumers meet first.
Dilution helper
How much can go in your concentrate?
Type the limit from the supplier's certificate and the strength of your perfume. The helper only does the sum; it holds no limits of its own, because limits change with each amendment.
5%
The most this material can make up of your concentrate, so that the finished perfume stays at or under 1 percent.
A full IFRA calculator would need every material's limit for every category. We do not reproduce those numbers: read them from IFRA's Standards and your supplier's certificate.
The law and your skin
Where IFRA stops
IFRA is not the law
The Standards are industry self-regulation. Cosmetics law sits on top of them: in the EU, Regulation (EC) No 1223/2009 asks for a responsible person, a safety assessment and a notification before a perfume is sold.
Allergens on the label
Regulation (EU) 2023/1545 added fragrance allergens that must be named in the ingredient list above 0.001 percent in leave-on products such as perfume, and 0.01 percent in rinse-off products.
For a hobbyist
No one enforces IFRA limits on a private hobbyist, but they exist mainly because some materials can sensitise skin, and sensitisation can be lasting. Follow them anyway, wear gloves and patch test.
Short answers
IFRA: short answers
The International Fragrance Association's risk management system for the safe use of fragrance ingredients. Each Standard is a prohibition, a restriction on how much may be used in each product category, or a specification on a material's quality.
Fine fragrance, including eau de parfum, eau de toilette, parfum and cologne, is IFRA Category 4.
No. They are the industry's own standards, required of IFRA members. Cosmetics law, such as EU Regulation (EC) No 1223/2009, sets the legal requirements, and a safety assessment for a product on sale will normally take IFRA compliance into account.
The 51st Amendment, notified on 30 June 2023. IFRA expects to notify the 52nd Amendment in January 2027, with transition periods before it applies.
To the finished product. If your concentrate is diluted to 20 percent, a material limited to 1 percent in Category 4 can make up at most 5 percent of the concentrate.
Sources
- International Fragrance Association, IFRA Standards (definition; prohibition, restriction, specification; compulsory for members), ifrafragrance.org.
- International Fragrance Association, Notification of the 51st Amendment to the IFRA Standards (30 June 2023).
- International Fragrance Association, IFRA launches consultation on latest update to its safe use program (52nd Amendment consultation package; open until 12 June 2026).
- International Fragrance Association, IFRA publishes End of Consultation Letter for the 52nd Amendment (1 September 2026; consultation from 12 December 2025; notification expected January 2027; 11 and 30 month transition).
- Regulation (EC) No 1223/2009 on cosmetic products, Articles 4, 10, 13 and 19; Commission Regulation (EU) 2023/1545 on fragrance allergen labelling, as quoted in our guide to making perfume at home.
Design with the limits already checked.
The Scent Lab in Fragnatique checks every formula against IFRA Amendment 51 and lists the allergens to declare. It is guidance for design, not a regulatory dossier; read what IFRA-aware means.
