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According to Alan Keith Tillotson Herbal Ratings color-codes ratings guidelines are:

You’ve said that some herbs are very safe for long-term use, but what about all the others?

Red Standard: The final group of herbs will be classified as Red standard. These Red standard herbs have certain essential properties that make them beneficial to many patients in states of poor health, but they also pose clearly defined dangers which must be known. Such herbs should be used only under the guidance of a trained professional.

Fair Use

Source: Alan Keith Tillotson, The One Earth Herbal Sourcebook, 2001

http://oneearthherbs.squarespace.com/one-earth-herbal-sourcebook

http://oneearthherbs.squarespace.com/downloads/BestOfTheBestHerbs.pdf