Everything you need to know about IFRA and the safe use of essential oils

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 organization 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.

Official website: IFRA – International Fragrance Association

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.

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.

 

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 categorization.

How does IFRA assess essential oils?

1) 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.

2) 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.

3) 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.

4) 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 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.

FAQ – most frequently asked questions about IFRA

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 categorization 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.

Why are some oils safe even undiluted, while others are strong allergens?

For example, lavender oil is generally well tolerated even with topical application, whereas cinnamon, clove or oregano are highly irritating and require strict dilution. IFRA limits tell you which concentrations are safe in a given category of use.

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.