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Favorable response to a low dose of an agent, such as alcohol, that has a detrimental effect at a higher dose.

[Greek hormēsis, eagerness, rapid motion, from hormān, to urge on; see hormone.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


a beneficial effect arising from exposure to a very small amount of a toxic substance
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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Hormesis and synergy: pathways and mechanisms of quercetin in cancer prevention and management.
Este efeito, conhecido como hormesis, ou efeito hormetico (CALABRESE; BALDWIN, 2002), foi introduzido por Southam e Erlich (1943) e vem sendo amplamente discutido e pesquisado com o objetivo de se compreender o mecanismo de acao estimulante e benefico de diversas substancias, inicialmente consideradas toxicas ou inibitorias em doses elevadas (CEDERGREEN; OLESEN, 2010; CARVALHO; ALVES; DUKE, 2013; BELZ; DUKE, 2014).
We propose that longevity promotion under conditions of Se deficiency may be attributed to 1) stress-response hormesis, an advantageous event of resistance to toxic chemicals at low doses; 2) reduced expression of selenoproteins with paradoxical functions to a lesser extent.
Exercise, oxidants, and antioxidants change the shape of the bell-shaped hormesis curve.
Beyond energy production, which mitochondria are most known for, Ray Griffiths takes us through the history and origin (from bacterial, parasitic invaders, to allies that have co-evolved), mitochondrial dynamics (how they sustain efficiency and mobility), their ability to be a hybrid engine when presented with fats or carbohydrates, ketone metabolism, immune regulation, calcium storage and regulation, control center for apoptosis, heme production, kidney detoxification and hormone synthesis, and their need for a touch of hormesis (biphasic dose response to a toxicant) in order to improve form and function.
Exercise is also a form of hormesis. The most important reason why exercising is healthy is because it damages the body.
Several factors are identified as responsible for outbreaks, such as the banning of some broad spectrum insecticides and acaricides, frequent dry spells, use of new varieties with characteristics that may favor the development of mite populations, and the hormesis effect caused by new pesticides (Guedes & Cutler 2014; Guedes et al.
5), it was observed a root increase at 1 and 100 mg x [kg.sup.-1] doses, followed by a negative effect on the highest doses (5,000 and 10,000 mg x [kg.sup.-1]), characterizing hormesis phenomenon [36].
It resembles the effect of hormesis that occur in plants adapted to stressors by exposure to a pollutant during long periods of the life cycle (Calabrese, Baldwin, & Holland, 1999).
These models may, however, not fit the measured data very well and they are often criticized due to their marginalization of hormesis (Calabrese, 2007, 2009).