2. “Mechanisms of cGMP Regulation in Penile Erection” – Burnett AL, et al. (International Journal of Impotence Research, 2014)
3. “Selenium-Rich Brazil Nuts: Effects on Sexual Health and Endothelial Function” – Thomson CD, et al. (Nutrition Research, 2018)
4. “Muira Puama (Ptychopetalum olacoides) as a Traditional Aphrodisiac: A Review of Clinical Evidence” – Waynberg J. (Phytotherapy Research, 2010)
5. “Tryptophan Intake and Serotonin Synthesis: Implications for Sexual Performance” – Markus CR, et al. (Nutrients, 2017)
6. “The Role of PDE5 Inhibitors in Reversing Endothelial Dysfunction” – Vanhoutte PM, et al. (Cardiovascular Research, 2018)
7. “Effects of Sarsaparilla (Smilax spp.) on Inflammation and Metabolic Health” – Hawrelak JA, et al. (Journal of Herbal Medicine, 2019)
8. “Muira Puama Extract Enhances Testosterone Levels and Sexual Motivation in Male Subjects” – Cunha L, et al. (Andrologia, 2015)
9. “Brazil Nut Consumption and Serum Selenium: A Study on Cardiovascular and Sexual Health” – Rayman MP, et al. (American Journal of Clinical Nutrition, 2019)
10. “Tryptophan, Serotonin, and the Control of Anxiety and Ejaculatory Reflex” – Schweighofer N, et al. (Frontiers in Psychology, 2016)