Best pure essential oils

Top pick: Piping Rock Lavender Pure Essential Oil (GC/MS tested) — it's the one bottle here that names a lab test on the label, and it's a single-origin lavender rather than a blend, so you know exactly what you're diffusing.

Who the others suit:

• Cliganic Organic Gift Set — best for a beginner who wants five everyday oils (peppermint, lavender, eucalyptus, lemongrass, orange) in one go; it's USDA organic, though it doesn't state GC/MS testing.
• Plant Therapy Wellness Set — for someone who wants ready-made blends (Germ Fighter, Immune Aid, Respir Aid) rather than single oils.
• Pursonic Collections — for a cheap starter set of classic singles in amber glass.

A note: most sets here don't publish third-party test results, so if a paper trail matters, buy single oils and ask the brand for its batch GC/MS report.