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An extensive literature search yielded 26 controlled trials published from 1961-1992, of which 6 studied echinacea for treatment and 6 for prophylaxis of URTIs.[17-28] The primary authors of 11 of these studies concluded that echinacea was superior to control treatment. Based on a systematic assessment of methodologic quality to estimate evidence supporting these conclusions, however, echinacea's efficacy for treating or preventing URTIs or the common cold was unclear in all but 1 of the 12 studies.
A second review was conducted of 13 randomized, double-blind, placebo-controlled trials of echinacea for prevention or treatment of URTIs.[29] Eight of the nine treatment trials reported benefit against URTI symptoms. The four trials of URTI prevention resulted in statistically insignificant evidence for prophylactic efficacy. Despite the trials' methodologic deficiencies, the reviewers concluded that current evidence suggests a role for echinacea in the treatment, but not prophylaxis, of acute URTIs.
Как говорил один из героев "Свадьбы в Малиновке":"Опять власть меняется".Как мы видим, нельзя как на 100% сказать, что помогает, как и нельзя на 100% сказать, что не помогает.НЕЛЬЗЯ И В МЕДИЦИНЕ БЫТЬ НА 100% ПРАВЫМ,так как крайне правые не всегда правы.Не надо впадать в крайности и делать однозначные заявления, что эхиноцея(как и вит С,как и бибиопрепараты и т.п.) на 100% бесполезны для использования в медицине