Randomized, placebo-controlled refers to elements of a study design used in scientific research, especially in clinical trials evaluating the effectiveness of products or interventions. It is considered a gold standard in clinical research for evaluating the efficacy of new products or ingredients because it helps control for various biases and confounding/variable factors.

When a study is randomized, participants are randomly assigned to different groups. This randomness helps to minimize bias and ensures that the subjects aren't purposely assigned to a group that may change the outcome.

In a placebo-controlled study, one group of participants receives the product or ingredient being tested (the active group), while another group receives a placebo—a dummy product that looks like the real product but has no formula ingredients or therapeutic effect (the control group). This allows researchers to compare the effects of the actual product against those of the placebo.

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