The placebo effect requires you to not know you're taking a placebo (patients in these studies are not told what it is about, they're just given pills/injections etc.) I can't think of a way you could feasibly set up a scenario where you were A) testing yourself for "the placebo effect", and B) not aware you are being given a placebo.
Is there a proven way to test if I'm susceptible to the placebo effect?
2 Related: Why use a placebo in some potential COVID-19 vaccine trials? What is the point of a placebo in studies where the subject can determine their group? The answers to the questions above give some very good reasons why a placebo or control group is necessary even when 'common sense' seems to indicate that it is not.
However, in order for the study to stay blind so that long term effects can be observed, they cannot be told they received a placebo. How do the pharmaceutical companies deal with this issue?
If placebo controls can have effects even when the patient is aware that the treatment is a placebo, then why not just always tell clinical trial participants they are using a placebo? Benefits Cost-effective Easier to recruit participants (Thus, potentially larger sample sizes)
If placebo controls work even when the patient is aware that the ...
In pharmacological trials, premature unblinding can be reduced with the use of an active placebo, which conceals treatment allocation by ensuring the presence of side effects in both groups.
vaccination - Did covid vaccine studies use an active placebo (with ...