Because it is highly bioactive, “less is best” when it comes to taking or applying wheatgrass.

For injuries, skin conditions etc. apply a little wheatgrass extract just once every second day. 

Wheatgrass can help improve and maintain good health, if you persevere with it. One teaspoonful of wheatgrass extract (e.g. Dr Wheatgrass Supershots) – on alternate days only – is sufficient. Also, hold the liquid in your mouth for a minute before swallowing. This allows absorption of bioactives through the oral lining into the bloodstream for a “whole body” effect.

Dr. Chris Reynolds.