Bar and body soap fall under IFRA Category 9. There's no single "max %" for an essential or fragrance oil — it depends on what's inside it, which your supplier's IFRA certificate states for your product type. Check your planned use against that number here, with the real per-constituent limits for reference.
Your supplier's IFRA cert lists the maximum % allowed in a Category 9 (soap) product. Enter that, and what you plan to use.
Not sure of your %? Work it out from the batch:
Use the same unit for both (grams, ounces — it's a ratio).
Enter your supplier's Cat 9 max % and your planned use to check.
Advisory, not a certification. This checks one fragrance against one number. A real recipe has several restricted substances at once — Alchemis runs the full per-constituent IFRA roll-up across your whole recipe, plus allergen and preservative checks. Always defer to your own supplier documentation.
The real per-constituent maxima (% in the finished soap), strictest first. If your supplier or a GC report gives you constituents, check each here. Same dataset Alchemis seeds.
| Constituent | CAS | Cat 9 max |
|---|
Source: IFRA 51st Amendment, Category 9. Values transcribed as facts; the IFRA standards document itself is not reproduced.
The full per-constituent IFRA check, allergen labels, batch tracking and cost-per-bar — for soap and five other crafts. Free forever for hobbyists.