Abstract
Several examples are discussed in this review, where substances without proven effects
were proposed for practical use within the scope of evidence-based medicines. The following is discussed
here: generalizations of the hormesis concept and its use in support of homeopathy; phytoestrogens
and soy products potentially having feminizing effects; glycosaminoglycans for the treatment of
osteoarthritis and possibilities of their replacement by diet modifications; flavonoids recommended for
the treatment of chronic venous insufficiency and varicose veins; acetylcysteine as a mucolytic agent
and its questionable efficiency especially by an oral intake; stem cells and cell therapies. In conclusion,
placebo therapies can be beneficial and ethically justifiable but it is not a sufficient reason to publish
biased information. Importantly, placebo must be devoid of adverse effects, otherwise, it is named
pseudo-placebo. Therapeutic methods with unproven effects should be tested in high-quality research
shielded from the funding bias. Some issues discussed in this review are not entirely clear, and the
arguments provided here can initiate a constructive discussion.
Keywords:
Placebo, hormesis, nutrition, phytoestrogens, soy, osteoarthritis, acetylcysteine.
Graphical Abstract
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