According to Dr. Edward E. Shook, a renowned herbalist and author of Advanced Treatise in Herbology , some of the vital and most potent principles of certain plants cannot be satisfactorily extracted by water alone. A very large number of resinous and oily materials can only be extracted by alcohol. However, he prefers glycerine to alcohol in making extracts wherever it is compatible. Extracts are quickly assimilated by the body and are convenient for first aid and travel kits. To take an herbal extract, simply add the recommended amount to a glass of warm or cold water or juice, then drink it.
Liquid herbs are highly concentrated herbal extracts suspended in a base of pure vegetable glycerin.
First, top-grade herbs, free from contaminants, are harvested and steeped to extract the key ingredients. The steeping temperature and time are individualized according to the herb being prepared. After the extract is ready, the liquid is removed under vacuum at room temperature. Next the herb is dissolved in vegetable glycerin. Glycerin is a natural, nontoxic food product which is naturally metabolized by the body.