L-theanine is a calming amino acid found primarily in tea: See Shinsuke Hidese, et al., “Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Controlled Trial,” Nutrients 11, no. 10 (October 2019): 2362. doi: 10.3390/nu11102362.
Ashwagandha, a small evergreen shrub: See Morgan A. Pratte, et al. “An Alternative Treatment for Anxiety: A Systematic Review of Human Trial Results Reported for the Ayurvedic Herb Ashwagandha (Withania somnifera).” Journal of Alternative and Complementary Medicine (New York) 20, no. 12 (2014): 901–8. doi:10.1089/acm.2014.0177.
Bacopa monnieri is a staple plant used in Ayurvedic medicine: See Sebastian Aguiar and Thomas Borowski, “Neuropharmacological Review of the Nootropic Herb Bacopa monnieri,” Rejuvenation Res 16, no. 4 (August 2013): 313–26.
Rhodiola rosea is another adaptogenic herb that fortifies the body to better handle stress: See Sana Ishaque, Larissa Shamseer, Cecilia Bukutu, and Sunita Vohra, “Rhodiola rosea for Physical and Mental Fatigue: A Systematic Review,” BMC Complement Altern Med 12 (2012): 70.
lignans can be helpful in balancing remaining hormones if a dog has been desexed within the first year of life: For a review of lignans and their biological effects, see Oregon State University’s Linus Pauling Institute’s Micronutrient Information Center and access its entry on the subject; https://lpi.oregonstate.edu/mic/dietary-factors/phytochemicals/lignans.