When comparing therapy to pharma treatments (of mental ill health), why no true control?

You see placebos, or medicines compared against each other. Why aren't there participants who are left without any intervention, especially when the placebo effect is well documented?When comparing therapy to pharma treatments (of mental ill health), why no true control?
You are right in stating the placebo effect is well documented (and especially so for drugs that target mental health disorders).





Control groups used in drug trials for drugs used to treat mental health disorders are paid subjects with no prior history of mental illness or use of drugs like antidepressants (i.e. ';healthy volunteers). Randomized double-blinded placebo crossover trials are quite common for this class of drugs because of this.When comparing therapy to pharma treatments (of mental ill health), why no true control?
i really didnt get ur ? WAT u mean.

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