An extract is an herbal preparation that is obtained by steeping an herb in an appropriate solvent, usually alcohol, glycerin or water, straining out the solid parts and then evaporating some or all of the solvent. An herbal extract is often diluted to adjust its concentration prescribed levels.
- Ann McIntyre (1995), The Complete Women’s Herbal
- David Hoffman (2013), Holistic Herbal: A Safe and Practical Guide to Making and Using Herbal Remedies
- Dr. Greg Sperber, Herbal Explorations: Phytoestrogenic Herbs
- Rosemary Gladstar (2014), Herbs for Common Ailments: How to Make and Use Herbal Remedies for Home Health Care