Noni has been consumed for hundreds of years and no side effects or dangers have ever been reported.
Noni has been used in traditional Polynesian medicine for hundreds of years and can be considered safe for humans, including children and pets. There are no records of any side effects to Noni juice. We have heard that a few people have experienced some minor discomfort, (such as bloating or mild digestive trouble), when they first started to drink Noni juice.
Less than 1% people are allergic to Noni. They may experience a rash, itching, mild diarrhea, or slight belching or trouble with breathing. Most of these symptoms are part of the cleansing process of Noni. Skip a dose or two and take lots of water. Most allergic symptoms disappear within 24 hours of discontinuing Noni. If these symptoms persist, stop drinking Noni. Notify your health professional and follow his or her advice.
In some regions of the world Noni Noni Juice and other Indian Mulberry, Morinda Citrifolia are used as a laxative. Predictably, some patients using higher concentrations of noni juice may experience some diarrhea. Although the risk of long-term adverse reactions is not currently known, it should be very low, because of the long history of mulberry species as a food in wide geographic regions. Patients with diabetes would be wise to find out the amount of sugars used to sweeten the particular product they wish to use.
There have been two reported cases in the medical literature regarding liver damage due to excessive noni juice consumption. As with any herb, it is best to use low amounts. I prefer using small amounts of different herbs as opposed to a large amount of a single herb. I also think that some herbs are healthy to ingest in small amounts, yet they have a potential to be harmful if used in excessive dosages. There is a possibility that noni itself was not the problem in these cases, but something else in the juice.