Unlike many medicines, wheatgrass extract is likely to work best if you use only a small amount, and not too often.
In other words, less is best!
Having had numerous healing successes with the extract since 1995, I have learned that over-treating can slow the healing process. In other words, don't apply it every day. Keep in mind "once or perhaps twice weekly" (say, Monday/Thursday) for many medical conditions and injuries.
Also, taking wheatgrass regularly can do much to improve amd maintain your state of health. Half to one teaspoonful (2.5 to 5 ml.) of wheatgrass extract (e.g. Dr Wheatgrass Supershots) – every two or three days - is sufficient, but make sure you hold the liquid in your mouth for a minute before swallowing. This allows absorption of bioactives in the extract to find their way through the wall of the mouth, directly into the bloodstream. If you persevere, they can produce a positive "whole body" effect.
Contact me if you need more information.
Dr. Chris Reynolds.