What sweet marjoram essential oil is, how it is distilled from Origanum majorana, what gives it a warm, herbal, gently calming scent, what research does and does not support, how to dilute and blend it, and how it differs from oregano, wild marjoram and Spanish marjoram oils.
What oregano essential oil is, which plants it comes from, why carvacrol makes it one of the strongest skin irritants in aromatherapy, the low dilution limits experts recommend, what research does and does not show, how oil of oregano supplements differ from the essential oil, and how to keep children and pets safe.
What juniper berry essential oil is, how it is distilled from the cones of Juniperus communis, what it smells like, what research does and does not support, the truth behind old kidney warnings, dilution and storage, pets, and how it differs from juniper twig, cade and Virginian cedarwood oils.
What wintergreen essential oil is, why it is almost pure methyl salicylate, how it relates to aspirin, its uses in muscle rubs and flavoring, why it is one of the most dangerous essential oils if swallowed, who should avoid it, safe dilution, storage and how to spot synthetic or adulterated oil.
What spearmint essential oil is, why carvone gives it a sweeter, gentler scent than peppermint, what research does and does not show, how to dilute, diffuse and blend it, safety for skin, children and pets, and how to choose a good bottle.
What cypress essential oil is, which tree it comes from, what gives it a fresh evergreen scent, what research does and does not support, how to dilute, diffuse and blend it, oxidation and storage, and how Mediterranean cypress differs from blue cypress and hinoki oils.
What helichrysum (immortelle) essential oil is, which Helichrysum species and regions it comes from, why it smells like honey and curry, what research says about skin and scar claims, why it is expensive and often adulterated, how to dilute and use it, and safety tips.
What lemon essential oil is, how cold-pressed and steam distilled lemon oil differ, why cold-pressed lemon can cause sun reactions on skin, safe dilution, oxidation and storage, diffuser and cleaning uses, what research on nausea and mood found and how to choose a good oil.
What black pepper essential oil is, why it smells spicy but does not burn like ground pepper, what small studies on cravings and swallowing found, how to dilute and diffuse it, oxidation and storage, blending ideas and how to choose a good oil.
What ginger essential oil is, why it smells warm but does not burn like fresh ginger, what the research on ginger aromatherapy and nausea actually found, how to dilute and diffuse it, oxidation and storage, and ginger oil vs CO2 extract.