H
| Homeostasis |
| The ability or tendency to maintain internal stability in an organism to compensate for environmental changes. To learn more about how your body systems are dependent on homeostasis, click here! |
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| Hydrodistillation |
| A variant of steam distillation. For hydrodistillation extraction, plant material is soaked for some time in water, after which the mixture is heated and volatile materials are carried away in the steam. The materials are then condensed and separated. |
| Hydroquinone |
| Also known as hydrochinone, hydroquinol, or quinol. It’s used in photographic dye chemicals; in medicine; as an antioxidant and inhibitor; and in paints, varnishes, and motor fuels and oils. Studies on rodents show some evidence that hydroquinone may act as a carcinogen or cancer-causing chemical, though its cancer-causing properties have yet to be proven in humans. |
| Hydrosol |
| The natural waters produced during the steam distillation of plant materials such as leaves, flowers, peels, berries, wood, stems, and roots. They’re produced during the same distillation process that also extracts essential oils. |