Possible harmful effects of probiotics include infections, production of harmful substances by the probiotic microorganisms, and transfer of antibiotic resistance genes from probiotic microorganisms to other microorganisms in the digestive tract.

Who should not take probiotics?

Although probiotics are generally safe to use, findings of a review from 2017 suggest that children and adults with severe illnesses or compromised immune systems should avoid using probiotics. Some people with these conditions have experienced bacterial or fungal infections as a result of probiotic use.

Is it harmful to take probiotics every day?

A common question about probiotics is whether it is ok to take probiotic supplements every day. Whilst there may be a few exceptions to this rule, the general answer is yes, it's safe, and usually recommended, to take them daily. It's important to understand that probiotics are a natural supplement and not a medicine.