Search for essential oils in the USA and you'll see "therapeutic grade", "clinical grade" and "medical grade" on almost every listing. They sound like official certifications. They aren't. No government body and no international standards organisation defines a "therapeutic grade". If you buy essential oils in bulk for cosmetics, aromatherapy products, food flavouring or household goods, it pays to know which standards actually exist, and what to ask your supplier for instead.
In short: judge an essential oil by its botanical identity, a GC-MS report against the relevant ISO standard or an agreed specification, and the documents your use needs: food-grade or FCC compliance for flavouring, IFRA and allergen data for cosmetics and fragrance. Labels such as "therapeutic grade" add nothing you can verify.
Where "therapeutic grade" came from
The phrase grew out of direct-selling and aromatherapy marketing. Some versions, such as "Certified Pure Therapeutic Grade", are trademarks owned by individual companies, not industry certifications. US regulators don't define the term, and ISO's essential oil standards don't contain any "therapeutic" category. That doesn't mean oils sold this way are poor; it means the label itself proves nothing.
The standards that do exist
| Standard or document | What it covers | When you need it |
|---|---|---|
| ISO standards for individual oils | Typical composition ranges and physical properties for a named oil (for example tea tree, lavender, peppermint) | Any serious specification; the benchmark for GC-MS results |
| Pharmacopoeia monographs (Ph. Eur., USP) | Quality requirements for oils used in medicines | Medicinal products |
| Food Chemicals Codex (FCC) / food-grade status | Purity and identity for oils used as flavourings; US GRAS lists | Food and beverage flavouring |
| IFRA Standards | Use limits for fragrance materials by product category | Cosmetics, fragrance, candles, household |
| EU Cosmetics Regulation allergen list | Fragrance allergens that must be named on labels above set levels | Cosmetics sold in the EU |
| Safety data sheet (SDS) | Hazards, handling and transport classification | All bulk shipments |
The EU allergen change for 2026
Commission Regulation (EU) 2023/1545 greatly expanded the list of fragrance allergens that must be named individually on cosmetic labels in the EU, from around two dozen to more than 80 entries, including several essential oils and extracts. Allergens must be declared above 0.001% in leave-on products and 0.01% in rinse-off products. New products placed on the EU market must comply from 31 July 2026, and products already on the market by 31 July 2028. If you sell cosmetics in the EU, ask your oil supplier for an allergen declaration covering the full new list.
What actually tells you an oil is good
- Botanical name, plant part and origin: lavender (Lavandula angustifolia) and spike lavender (L. latifolia) are different oils.
- GC-MS report for your batch: compared with the ISO ranges or your agreed specification. Our guide on reading a GC-MS report shows what to look for.
- Physical tests: specific gravity, refractive index and optical rotation, which shift when oils are diluted or blended.
- Documents for your use: SDS, allergen and IFRA data for cosmetics; food-grade documents for flavouring.
- Storage and age: oxidised oils smell different and can be more sensitising; see shelf life and storage.
There's no such thing as a certified "therapeutic grade". There is such a thing as a well-documented oil, and that's what to buy.
Essential oils from Arizone
Arizone International LLP supplies essential oils such as lavender, tea tree, peppermint and eucalyptus to export customers, with a certificate of analysis for every batch and GC-MS reports and SDS available for your order. Tell us your end use and market, and we'll confirm the specification and documents you need. See also our bulk essential oils buyer's guide.
Sources: Commission Regulation (EU) 2023/1545; AromaWeb: therapeutic grade essential oils.
Essential Oil Grade Questions
No. It isn't defined by any regulator or by ISO. Some versions are company trademarks. Judge oils by identity, GC-MS results and documents instead.
ISO standards for individual oils, pharmacopoeia monographs for medicines, food-grade specifications for flavouring, and IFRA and EU allergen rules for cosmetics.
Regulation (EU) 2023/1545 adds many fragrance allergens to the labelling list. New cosmetics must comply from 31 July 2026, existing ones by 31 July 2028.
Ask for a GC-MS report for your batch compared with the ISO standard, plus physical tests such as optical rotation and refractive index.