IFRA standards set out how much essential oil a finished product may contain — separately for each category, from perfumes through creams and shampoos to candles. They are needed because many essential oils naturally contain allergens and, at higher concentrations, can cause irritation or an allergic reaction. In this article we look at what IFRA is, how it assesses essential oils and how to read the IFRA certificate for your oil.
About this article
This article provides an overview of IFRA standards, explains their importance for the safe use of essential oils in cosmetics and aromatherapy, shows how to read IFRA certificates and how to correctly determine the maximum permitted concentrations in individual products. You will learn why some oils can be used undiluted, why others are strong allergens, and what IFRA means for cosmetics manufacturers and home formulators.
What is IFRA?
IFRA is the abbreviation for International Fragrance Association. It is a global organisation that brings together manufacturers of perfumes, aromatic ingredients and essential oils with the aim of ensuring that fragrances and essential oils are safe for people and the environment.
IFRA publishes so-called IFRA standards — recommendations and limits for the safe use of fragrances and essential oils in various product types and categories of use.
Official website: IFRA — International Fragrance Association
How often is IFRA updated?
IFRA standards are continuously reviewed in line with new scientific knowledge. The latest published version is the 51st Amendment (2023). Updates may introduce new substances, adjust maximum limits or change categorisation.
Why are IFRA standards important?
Many essential oils naturally contain allergens (e.g. linalool, limonene, eugenol, citral). Although they are of natural origin, at higher concentrations they can cause irritation or allergic reactions. Based on toxicological and dermatological data, IFRA sets conditions of use for individual components and mixtures so that they are both effective and safe.
IFRA in brief
How the assessment of essential oils works at IFRA
- Composition analysis
Each essential oil has a characteristic profile of constituents (typically determined by GC/MS), from which potential risks and the need for limits are derived.
- Identification of allergens
The content of naturally occurring allergens (e.g. linalool, limonene, eugenol, citral) and other safety-relevant components is quantified in the oil.
- Assessment of the oil as a whole
IFRA does not assess only a single allergen in isolation but considers the entire essential oil as a mixture. For example, lavender oil may contain approximately 30 % linalool and still be designated as “Not Restricted (NR)” in the current version, as long as the available data and exposure models are consistent with the safe use of the oil as a whole. Conversely, if the same allergen is added to the formulation separately (as an isolated substance), direct limits for that substance apply.
- Classification into categories
IFRA distinguishes 12 main categories (e.g. perfumes, creams, shampoos, candles, mouthwashes…). For each category, maximum permitted use levels or an NR designation are defined, which apply to the finished product.
How to read an IFRA certificate
An IFRA certificate usually contains:
- the name of the essential oil or fragrance,
- the amendment number according to which the document was issued,
- a list of categories (1 – 12) with the maximum permitted use levels in %,
- any “Not Restricted (NR)” designation for the given category.
Practical example: if an essential oil has a limit of 8 % for category 2 (deodorants and antiperspirants), you may use a maximum of 8 g of this oil in 100 g of cream.
Why some oils are safe even undiluted and others are strong allergens
For example, lavender oil is generally well tolerated even with topical application, whereas cinnamon, clove and oregano are highly irritating and require strict dilution. IFRA limits tell you which concentrations are safe in a given category of use.
Why is IFRA important for cosmetics manufacturers?
- Consumer safety
Reducing the risk of irritation and allergies.
- Regulatory compliance
IFRA serves as a scientific basis for regulation (e.g. in the EU).
- Transparency and trust
Clear declaration of allergens on the label.
- International trade
Compliance with IFRA facilitates placing products on various markets.
Frequently asked questions about IFRA
Practical questions about whether IFRA is binding, the NR designation, updates to the standards, finding the limit for a particular oil and which products IFRA applies to.
Is compliance with IFRA mandatory?
IFRA itself is not a law, but its standards are a reference basis for legislation. In practice, IFRA limits are observed when cosmetics are placed on the market.
What does “Not Restricted (NR)” mean?
NR means that no quantitative restriction is set for the given category. However, allergens must be listed on the label if they exceed the labelling threshold laid down in EU Regulation 1223/2009.
How often does IFRA change?
IFRA is updated continuously according to new data; the current version is the 51st Amendment (2023). With each update, limits or categorisation may change.
How do I find out the limit for my oil?
Ask your supplier for an IFRA certificate. It states the maximum permitted percentages of use for each product category. Example: with a limit of 8 % for category 2 (deodorants and antiperspirants), you may use a maximum of 8 g of this oil in 100 g of cream.
Why are some oils safe even undiluted, while others are strong allergens?
It depends on the particular oil. Lavender oil is generally well tolerated even with topical application, whereas cinnamon, clove and oregano are among the highly irritating oils and require strict dilution. You will find the safe concentration for a given category of use in the IFRA limits for that oil.
Does IFRA also apply to candles and diffusers?
Yes. IFRA also defines categories for non-pharmaceutical and non-cosmetic products (e.g. candles — cat. 9, cleaning products — cat. 10).
Conclusion
IFRA standards are a key tool for the safe and responsible use of essential oils — they help you dose correctly, interpret limits for individual categories, declare allergens transparently and create products that are both effective and safe.
For creams, deodorants, shampoos and candles — you will find essential oils in the Handymade range. Check the limits for individual product categories in the IFRA certificate of the particular oil.
