: Avoid labels that say "fragrance oil," "nature-identical," or "perfume oil," as these are synthetic and lack therapeutic properties.

: High-quality suppliers specify how the oil was extracted (e.g., steam distillation) and which part of the plant was used (e.g., leaves vs. bark).

: Reputable brands provide batch-specific Gas Chromatography-Mass Spectrometry (GC/MS) reports to prove the oil is free from adulterants or synthetic fillers.

To buy pure essential oils, prioritize brands that offer transparency through third-party lab results and detailed labeling, as the industry lacks strict government regulation.