Liver cleanse for 6 1/2 year old with sinus/hayfever allergies

Our 6 1/2 year old has continual sinus/hayfever problems during this season. It is especially bad this season. He wakes each morning completely clogged and spends all day clearing his nose. He was born premature (31 weeks) and has never had any other problems. We began noticing dark circles under his eyes and put him on a gluten-free diet and that seemed to clear up his eyes for a short time. This also helped with more infrequent bowel movements. But the dark circles are back with the sinus issues. We want to cleanse his liver with a liver cleanse (olive oil and grapefruit juice, Epsom Salt drinks over a 24 hour period) that we read about on curezone. Has anyone had any success with this cleanse on this age of child? Also, anyone heard about the dark circles under the eyes? We appreciate any help. Thanks. Tweet