We were also told that this was just a strong detoxing symptom. Howvever we just couldn't buy the story anymore. Nausea and headaches and especially hives are a reaction to something, not detoxification. There is no other herb or juice concoction that makes you detox within seconds with these strong reactions. What we did trace it to is the mold that grows on the trays.
Mold is highly toxic and can cause instant reactions such as headaches and nausea and even hives.
The mold comes from the seeds that don't germinate, and that is why some trays are better than others. We tried using hydrogen peroxide and colidial silver and even picking out the ungerminated seeds with tweezers. We also noticed that those with candida got much worse after drinking wheatgrass juice. So after being indoor growers of wheatgrass juice for over seven years, we decided that we couldn't serve any more knowing that all the so called detoxing symptoms were reactions to the mold. We shut the whole thing down.