, Volume 236, Issue 2, pp 613–623 | Cite as

The acute effect of Hypericum perforatum on short-term memory in healthy adults

  • Eldad YechiamEmail author
  • Daniel Ben-Eliezer
  • Nathaniel J. S. Ashby
  • Mili Bar-Shaked
Original Investigation



Over-the-counter drugs containing Hypericum perforatum (H. perforatum) have been argued to improve memory and sustained attention. So far, these claims have not been supported in human studies. However, previous studies used rather high dosages, and little is known about the acute effect of small dosages.


We evaluated whether an acute treatment with Remotiv 500 and Remotiv 250 (500 or 250 mg of H. perforatum quantified to either 1 or 0.5 mg of hypericin) improved memory and sustained attention, as well as mood and state anxiety in healthy adults.


A single dosage, randomized, double-blind, placebo-controlled trial was conducted with 82 student participants (33 women). Each participant received placebo in one session and one of two dosages in the other session. Order of the sessions and dosage conditions were randomized between subjects. Participants completed a battery of tasks assessing short-term memory capacity and sustained attention.


A significant positive effect of Remotiv 250 on digit span (mean Cohen’s d = 0.58; p = .01) was observed. By contrast, Remotiv 500 had a negative effect on digit span (mean d = − 0.48, p = 0.04). A similar effect emerged when factoring across tests of short-term memory. Both dosages improved mood (d = 0.60, p = .03).


The results indicate that acute treatment with small (250 mg) dosages of H. perforatum has a positive effect on the capacity of short-term verbal memory, and stress the importance of maintaining small dosages in nootropic applications.

Trial registration NCT02862236.


Hypericum perforatum Short-term memory Small dosage 



This work was supported by the I-CORE program of the Planning and Budgeting Committee and the Israel Science Foundation (1821/12).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

213_2018_5088_MOESM1_ESM.docx (21 kb)
ESM 1 (DOCX 20 kb)


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Max Wertheimer Minerva Center for Cognitive StudiesTechnion—Israel Institute of TechnologyHaifaIsrael
  2. 2.Harrisburg University of Science and TechnologyHarrisburgUSA
  3. 3.Beer Yaakov-Ness Ziona Mental Health CenterNess ZionaIsrael

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