Maximum use levels for common restricted fragrance materials, per IFRA product category — transcribed from the 51st Amendment, in plain language. Pick a substance:
A mild, faintly balsamic ester used as a fixative and solvent — it turns up in jasmine and ylang-ylang blends and in many balsamic notes.
A soft, almost odourless floral blender common in white-floral and sunscreen-adjacent scents — quietly present in a large share of commercial fragrances.
The sharp lemon note — a major constituent of lemongrass, litsea cubeba and lemon myrtle oils, so citrus-heavy naturals hit its ceiling fast.
A fresh rosy-citronella note, prominent in rose and geranium oils. Comparatively roomy limits, but it still needs declaring on EU labels.
The sweet new-mown-hay note of tonka bean, also present in cassia and some lavenders — a staple of gourmand and fougère blends.
The warm clove note — dominant in clove bud oil and significant in cinnamon leaf, basil and bay. Spiced autumn blends live and die by this row.
A delicate lily-of-the-valley/linden note found in neroli, ylang-ylang and rose — also used as a deodorising component in natural cosmetics.
The core sweet-rose note — a major constituent of rose, palmarosa and geranium oils and present in dozens of others, so it accumulates across a blend.
A synthetic lily-of-the-valley note used where muguet is wanted — common in floral fragrance oils rather than essential oils.
A carnation-clove note found in ylang-ylang, nutmeg and clove oils. One of the strictest rows on this list — small numbers everywhere.
The deep forest-floor base of chypre and fougère perfumery (Evernia prunastri). Tight limits across the board, including rinse-off.
The damascone/ionone family behind the jammy depth of modern rose accords — potent at trace levels, and limited accordingly.
This table shows the nine IFRA categories Alchemis maps maker products to. The full 51st Amendment defines more (fine fragrance, deodorant, hair and others) — the official standards live at ifrafragrance.org. Advisory reference, never a certification. Percentages apply to the finished product. If a supplier certificate for your blend says otherwise, the certificate wins — it accounts for the actual composition.