As you study science, and really try to understand what is happening behind the curtain, not just reading the predigested press releases but actually talking to scientists or reading technical papers, you realize that ... it's always more complicated than you think. ... No measurement is simple. ... The way you make the comparison will address different issues.
American neurologist, skepticist
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Placebo effects (plural) are mostly reporting bias, regression to the mean, investment justification, researcher bias, and other sources of self-deception. They are transient, and significant only for subjective symptoms where reporting bias can play a major role. Studies have shown, in fact, that there is no significant "healing" that occurs due to placebo effects — no objective biological improvement.
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The thing about herbs is that there is nothing supernatural or implausible about the fact that any particular herb can have a medicinal effect. But the truth of the matter is that herbs are drugs. There's nothing magical about them. The fact that they are "natural" is irrelevant — it's meaningless. They are drugs. They are drugs that have not been purified, identified, … and quantified. … Probably for most plants … there are hundreds of chemicals in there with varying degrees of potency.