Double blind studies much better than a single blind study, mainly to avoid mental bias. Thinking that drug will make someone better alters the mind to feel like it has actually worked. This is true for both the patient and the clinician. If the clinician is not blind to which drug does what, they may foster bias questions and approaches to the patient hinting to what the drug is supposed to do. If the clinician is not aware of the drugs, like in a double blind study then he/she will follow only one method for all drugs and patients and won’t be able to foster biased conversations and questions. This way the patient truly won’t know what to expect and can’t be mentally biased themselves. This allows for the true effect of the drug to be seen.