Fragrance Regulatory: 50 Shades of Grey
Updated October 2026 · IFRA Amendment 51
Fragrance safety regulations can be confusing—even for those of us who work with them every day. Many people think of IFRA limits as black-and-white rules, but in reality, they exist in a constantly shifting world of grey.
Key Takeaways
- 01IFRA sets maximum usage levels per ingredient and per product category, based on how much fragrance a person is realistically exposed to — mostly through the skin.
- 02Limits change on purpose: new toxicology and exposure data arrive through numbered Amendments, currently IFRA Amendment 51.
- 03Real-world habits move categories — reed diffusers were re-classed once people started flipping reeds by hand.
- 04Phototoxicity warnings apply only to products that stay on the skin and see sunlight — never to candles, diffusers, or room sprays.
What IFRA Does (and Why It Matters)
We follow IFRA Standards for all of our fragrance oil formulations. IFRA—the International Fragrance Association—is the global governing body for fragrance safety and regulatory guidance. Compliance is technically voluntary, but their recommendations are widely used across the professional fragrance and cosmetics industry.
IFRA sets maximum recommended usage levels for fragrance ingredients based on:
- the ingredient composition (including allergens)
- the product type (skin cream, perfume, candle, soap, etc.)
- how the final product is realistically used
These limits are regularly updated as new research and toxicology data emerge. Major revisions occur through numbered Amendments—we are currently at IFRA Amendment 51.
IFRA is not the law, and the law asks for something different. An IFRA Standard tells you how much of an ingredient a formula may carry in a given product type. It does not tell you what a finished label has to say. Those are separate duties, and they are set regionally:
- European Union. The Cosmetic Products Regulation has long required 26 named fragrance allergens to be declared on the label when they exceed set thresholds; two of those, Lilial and HICC, are now banned outright, leaving 24 still in use. Regulation (EU) 2023/1545 expands that list to more than 80. Products placed on the EU market have had to carry the expanded declarations since 31 July 2026, and products already made available have until 31 July 2028.
- Great Britain. Has not adopted the expansion and remains on the original 26.
- United States. There is no federal fragrance-allergen declaration list. MoCRA has required responsible-person contact information on cosmetic labels since 29 December 2024.
A formula can sit inside every IFRA limit and still carry a labeling obligation, which is why the two are tracked separately. Our guide to US and EU allergen labeling sets the two regimes side by side.
Why IFRA Limits Keep Changing
At the simplest level, IFRA limits are about fragrance exposure, especially through the skin. Our skin is the body’s largest organ, and IFRA evaluates how much fragrance a person is realistically exposed to for each product category.
But this is not an exact science—and real-world behavior changes over time.
Example: Reed diffusers
For many years, reed diffusers were treated much like candles: “no contact” products. But consumer habits changed. Many people flip reeds by hand, which means actual skin exposure. IFRA updated the category and restrictions to reflect that real-world use.
Ingredient data changes too
New toxicology, sensitization data, and exposure modeling constantly update what we know about hundreds of raw materials and naturally occurring constituents. Some limits become stricter; occasionally others are clarified. This is why IFRA documentation continues to evolve.
The result: IFRA limits shift over time, and they don’t always feel intuitive—but they are built on ongoing research, scientific review, and global safety alignment.
Three separate inputs move a number on an IFRA Standard, and they move it for different reasons:
| What moves the limit | What changes | What it looks like in practice |
|---|---|---|
| Ingredient data | New toxicology, sensitization data and exposure modeling for a raw material or a naturally occurring constituent | Some limits become stricter; occasionally others are clarified |
| Real-world use | How people actually handle a finished product, rather than how it was assumed to be handled | Reed diffusers were re-classed once it became clear people flip the reeds by hand |
| Product category | The category a finished product sits in, and how much fragrance the skin is realistically exposed to there | The same oil carries a different maximum in a skin cream than in a candle |
For a more technical breakdown of categories and usage limits, see our full guide: Understanding IFRA 51st Amendment & How to Use IFRA.
Which Category Does a Finished Product Sit In?
An IFRA Standard does not give a fragrance oil one number. It gives it a number for each product category—twelve of them—and the category is decided by where the finished product is used and how much fragrance realistically reaches skin. A deodorant sits against thin, often freshly shaved skin all day. A candle never touches skin at all. The same oil is allowed in very different amounts in each.
That list is the Uses restrictions section of an IFRA 51 Regulatory Data Sheet. Below is that section for one oil in our own catalog—HUCKLEBERRY (E21047632), sheet version 4, issue date 25 April 2024—set out in the order the categories appear on the sheet:
| IFRA category | Typical products | Maximum for this oil |
|---|---|---|
| 1 | Lip products; children’s toys | 9.62% |
| 2 | Deodorants and body sprays, spray and non‑spray | 2.87% |
| 3 | Eye make‑up and make‑up remover | 3.9% |
| 4 | Fine fragrance, eau de toilette, fragrance creams | 40% |
| 5A | Body lotions | 13.75% |
| 5B | Face moisturizers | 7.7% |
| 5C | Hand creams | 7.7% |
| 5D | Baby creams, oils and talcs | 2.6% |
| 6A/6B/6D | Toothpaste, mouthwash, tooth powder | 0.47% |
| 7A/7B | Hair treatments, leave‑on and spray hair products | 7.7% |
| 8 | Products with significant ano‑genital exposure | 2.6% |
| 9 | Rinse‑off body and hand products; hand wash | 15% |
| 10A | Household care with hand contact; reed diffusers | 15% |
| 10B | Aerosol and spray air fresheners | 25% |
| 11A/11B | Inert products with minimal transfer to skin | 2.6% |
| 12 | Candles, plug‑ins, car air fresheners | 100% |
Read across it and the range is the whole point: 2.87% in a deodorant, 40% in an eau de toilette, 100% in a candle. Three numbers, one oil, one document. Nothing about the oil changed between those rows; only the amount of it a person’s skin is expected to meet.
The pattern holds past a single sheet. Across the fourteen IFRA 51 Regulatory Data Sheets on file here as this was written, Category 12—products never intended to touch skin—carries the highest or joint‑highest maximum on all fourteen, while Category 4 ranges from 4.3% to 40% depending on the oil. There is no single IFRA percentage to memorize, which is why the sheet travels with the oil rather than with the category.
Each oil’s own Regulatory Data Sheet is posted on its product page under the Documentation tab, and further documents can be requested at any time. Whether a given product is leave‑on or rinse‑off is usually the quickest way to find the right row.
A Note About Phototoxicity
Some IFRA documents include phototoxicity statements. These warnings are triggered by naturally occurring compounds—especially from citrus materials—that can increase skin sensitivity when combined with UV exposure.
Importantly, phototoxicity considerations apply only to:
- products that remain on the skin
- products exposed to sunlight (e.g., lotions, sunscreens)
They do not apply to non-skin-contact categories like candles, diffusers, or room sprays.
Frequently Asked Questions
Are IFRA Standards legally required?
Compliance is technically voluntary, but IFRA’s recommendations are widely used across the professional fragrance and cosmetics industry. Stock Fragrance follows IFRA Standards for all of its fragrance oil formulations.
Why do IFRA limits keep changing?
Two things move them. New toxicology, sensitization data and exposure modeling continually update what is known about hundreds of raw materials and their naturally occurring constituents, and real-world behavior changes how much skin exposure a product category actually involves. Major revisions arrive through numbered Amendments; the current one is IFRA Amendment 51.
Do phototoxicity warnings apply to candles and room sprays?
No. Phototoxicity considerations apply only to products that remain on the skin and are exposed to sunlight, such as lotions and sunscreens. They do not apply to non-skin-contact categories like candles, diffusers, or room sprays.
Where do I find the IFRA limit for a specific oil?
On that oil’s IFRA 51 Regulatory Data Sheet, which gives its maximum usage level category by category. Documentation is posted on every product page under the Documentation tab, and additional documents can be requested at any time. Our guide to reading an SDS and an IFRA document walks through which sheet answers which question.
Does following IFRA mean my label is compliant?
No. An IFRA Standard governs how much of an ingredient a formula may carry in a given product type; what the finished label must declare is set regionally and separately. In the EU, 26 named fragrance allergens have long been declarable above set thresholds, and Regulation (EU) 2023/1545 expands that list to more than 80 — required on products placed on the market since 31 July 2026, with products already made available given until 31 July 2028. Great Britain remains on the original 26. The US has no federal allergen declaration list, though MoCRA has required responsible-person contact information on cosmetic labels since 29 December 2024.
Does one fragrance oil have a single IFRA limit?
No. An IFRA Standard sets a maximum for each of twelve product categories, and the category is decided by where the finished product is used and how much fragrance reaches skin. One oil in our catalog is capped at 2.87% in a deodorant, 40% in an eau de toilette and 100% in a candle, all on the same sheet. That oil’s own IFRA 51 Regulatory Data Sheet, posted on its product page under the Documentation tab, carries the figure for every category.
Final Thoughts
IFRA limits aren’t static rules—they are living guidelines that evolve alongside science, exposure modeling, and how real people use fragranced products. While the changes can sometimes feel inconsistent, they exist to support a globally recognized approach to fragrance safety.