You’ve got a best-seller in the making: the scent is strong, the throw is spot on, and customers are already asking for it in three more formats. Then you hit the question that decides whether you can actually sell it: “What’s the IFRA limit for this fragrance oil in my product?”
This guide is here to make IFRA limits feel practical - not like a regulatory maze. If you’re making wax melts, candles, reed diffusers, room sprays, body sprays, soaps, bath bombs or broader cosmetics in the UK, IFRA is one of the core guardrails for safe fragrance use. And once you understand how it works, it becomes a tool for scaling faster with fewer setbacks.
What IFRA limits actually are (and what they’re not)
IFRA stands for the International Fragrance Association. When people say “IFRA limits”, they’re usually referring to the maximum level of a fragrance (or certain restricted ingredients within it) that can be used in a specific type of finished product.
Two important clarifications:
First, IFRA limits aren’t a general “maximum fragrance load” recommendation for performance. They’re about safety and sensitisation risk in the final product. Your wax might happily hold 10% oil, but IFRA might only allow 3% for a certain fragrance in a certain skin-contact category. That’s not a performance debate - it’s compliance.
Second, IFRA doesn’t give one universal number per fragrance oil. The limit changes depending on what you’re making, because exposure changes. A rinse-off soap is different to a leave-on body lotion. A candle is different to a body spray. The category matters.
The document you’re looking for: the IFRA certificate
Every compliant fragrance oil should have an IFRA certificate (often called an IFRA statement). This isn’t just paperwork for the sake of it. It’s the sheet that tells you, for that specific fragrance composition, the maximum permitted concentration in each IFRA product category.
You’ll normally see:
- The IFRA Amendment version (the current framework update)
- A table of IFRA categories with maximum percentages
- Sometimes notes about restrictions driven by specific ingredients
IFRA categories in plain English
IFRA categories can look intimidating because they’re numbered, and the wording can feel more “lab” than “maker”. The simplest way to approach them is by exposure type.
Some categories are leave-on skin products (higher exposure, usually lower limits). Think body lotions, perfumes worn on skin, deodorants.
Some are rinse-off products (generally higher allowable limits than leave-on, but still tightly controlled). Think soaps, shampoos, shower gels.
Some are non-skin products (often much higher limits, but not always unlimited). Think candles, wax melts, diffusers, room sprays - though sprays can have inhalation exposure, so they’re not always treated as “easy”.
Here’s the trade-off: the more direct and prolonged the contact with skin, the stricter the limit tends to be. That’s why one fragrance oil might be fine at 10% in a candle but limited to 1% in a face cream.
A practical guide to IFRA limits fragrance oils by product type
Most makers don’t need to memorise category numbers. You need to map your product to the right category on the certificate, then use the maximum percentage correctly.
Candles and wax melts
For candles and melts, you’ll typically be working within an IFRA category for air freshening or non-skin contact. Limits are often generous, but you still can’t assume “no limit”. Some fragrance compositions include restricted materials that apply across multiple categories.
Also, performance and compliance aren’t the same thing. If IFRA allows 10% but your wax performs best at 6-8%, stick with what gives a consistent burn and strong throw. Scaling a product is about repeatability, not chasing the highest number.
Reed diffusers
Diffusers are another common “high limit” area, but they’re not automatically unlimited. They’re also a place where makers can accidentally create a stronger exposure than expected because diffusers run continuously in the home.
If you’re formulating diffuser base plus fragrance, keep your calculations tied to the finished product concentration (not the bottle size or how strong it smells). That finished percentage is what you compare to the IFRA limit.
Room sprays
Room sprays sit in a slightly more nuanced spot. Yes, they’re not intended for skin contact, but they can involve inhalation exposure and can settle onto surfaces. IFRA certificates usually provide a category for air fresheners/sprays, and the limits can be lower than people expect.
If you also sell “linen sprays”, be extra careful. Customer behaviour changes the risk - people may spray bedding, clothing, soft furnishings, and sometimes skin comes into contact afterwards. Your label claims and intended use matter.
Body sprays and perfumes
This is where IFRA becomes non-negotiable. Body sprays and perfumes are leave-on products, and limits can be tight for certain fragrance types.
A common mistake is assuming “perfume can handle loads of fragrance”. In reality, perfumery is exactly where sensitisation risk is taken seriously. The safe level might be 2%, 5%, 15% - it depends entirely on the fragrance.
If you’re selling these products in the UK, you’ll also need proper cosmetic compliance, not just IFRA awareness. IFRA is one piece of the puzzle.
Soap and bath bombs
Soap is rinse-off, but still skin contact. Bath bombs are also skin contact, and the exposure can be significant because you’re in the water for a while.
Your IFRA certificate will have separate categories for different rinse-off uses. Don’t “best guess” which one applies. Match your product type properly so you’re not accidentally using the wrong limit.
Lotions, creams, scrubs, deodorants
As soon as you move into leave-on cosmetics, you’ll find many fragrances drop to low permitted levels. That doesn’t mean you can’t make a great product - it means your scent strategy changes.
You may need to:
- Choose fragrance types that naturally have higher IFRA allowances in leave-on categories
- Accept a softer scent profile for certain product lines
- Offer strongly scented home fragrance alongside more skin-friendly cosmetics
How to calculate IFRA compliance (without overthinking it)
IFRA limits are expressed as a maximum percentage of the fragrance compound in the finished product.
So the key number is:
Finished product fragrance concentration (%) = (weight of fragrance oil ÷ total weight of finished product) x 100
If an IFRA certificate says the limit for your category is 3%, your finished product must contain 3% or less fragrance oil by weight.
This stays true even when you’re using bases, solvents or carriers. For example, if you make a room spray by blending fragrance with a spray base, the “finished product” is the whole bottle contents. Don’t calculate against just the base portion.
If you want a simple workflow that scales:
Decide the product category first, find the maximum % on the IFRA certificate, set your target fragrance % below that maximum (many makers build a small buffer), then lock the recipe and record it in a batch log. That’s how you avoid reworking formulas every time you restock.
“It depends” scenarios that catch makers out
IFRA is straightforward until it isn’t. These are the moments where confidence comes from being cautious and consistent.
Fragrance oil blends: If you blend two fragrance oils, you can’t just use the higher limit and hope for the best. You need to ensure the blend is compliant for the category. Practically, that means keeping your total fragrance concentration within safe levels and being very careful about restricted ingredients. If you’re selling blended scents at scale, consider sticking to single oils unless you have solid documentation for the blend.
Multi-use products: If you market a spray as “room and body”, you’ve effectively moved into a stricter category. Claims can force you into lower limits because intended use changes.
Seasonal launches: Spiced, cinnamon-heavy, and certain floral profiles can have lower IFRA limits in skin categories. If your Christmas range is planned to expand into body products, check certificates early - it can save you a full rebrand of that scent later.
IFRA, CLP, and cosmetic assessments: how they fit together in the UK
IFRA helps you choose safe fragrance levels. CLP labelling communicates hazards and safe handling for the finished mixture (especially for home fragrance products). Cosmetic compliance sits under a different legal framework, including safety assessments.
For many UK makers, the practical approach is: use IFRA to set your fragrance percentage, use that formula to generate correct CLP labels for products that require them, and if you’re selling cosmetics, get the proper Cosmetic Assessment Report so you can scale without guessing.
If you’re sourcing fragrance oils and supplies from a maker-focused supplier like Craftiful, build your routine around keeping the paperwork with your recipes from day one. It’s much easier than trying to recreate your compliance trail after you’ve sold 300 units.
The point of all this: faster launches, fewer headaches
IFRA limits can feel like a constraint until you use them the right way. When you know your allowed percentage per product type, you stop reformulating on the fly, you stop worrying every time a customer asks “can I have this as a body spray?”, and you start planning ranges strategically - strong home fragrance where you can go bold, and skin products where you choose scents that behave well within tighter limits.
Make compliance part of your product development rhythm, not a hurdle you face right before listing day. The makers who grow quickest aren’t the ones who ignore the rules - they’re the ones who build with them, then move faster because they can sell with confidence.
