1 · Pick the part of the plant
Then pick a process below, or both, to narrow the list.
2 · How it was processed
Naturals in the library:
Why part and process matter
Cold-expressed citrus oils keep non-volatile compounds such as furocoumarins, which drive phototoxicity limits for leave-on skin products. The distilled oil from the same fruit carries far less of them.
Absolutes and resinoids contain heavier compounds than distilled oils, so their allergen and impurity profile differs, for example atranol in lichen extracts.
Folded, terpeneless and rectified oils concentrate some components and remove others. Always classify, and calculate allergens, from the composition of the grade you actually buy.
Typical paths
Citrus peel→Cold expression→Folded / FCF
Flowers→Concrete→Absolute
Leaves→Steam distillation→Rectified oil
Resin→ResinoidorDistilled oil
Spice→OleoresinorCO2 extract