Not only it is safe to do liver flush, but it is necessary!
The only way bilirubin can leave human body is through liver and through bile ducts, and the main purpose of Liver Flush is to flush out content from the bile ducts and to restore liver functions.
If you want your son healthy, he should start flushing his liver ASAP.
Bowel Cleanse, parasites Cleanse, helthy diet are also things to explore!