A study done by Bellavite P. et al. found that Gelsemium had a positive action on anxiety in lab mice. This remedy was given in a 5C potency and compared to an anti anxiety drug called diazepam as well as a placebo. Researchers concluded that Gelsemium had a positive influence on the mice with regards to emotional responses to novel environments. There was a significant decrease in fear related behaviour exhibited in this mice. When additional tests were performed with a higher potency, 30C, they found that it had even a greater effect.

Source: Bellavite P. et al. Homeopathic Doses of Gelsemium sempervirins Improve the Behavior of Mice in Response to Novel Environments. Evidence-Based Complimentary and Alternative Medicine, e-Cam online advanced publication, 2009 Sep 14. ecam.oxfordjournals.org/cgi/content/full/nep139v1