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**Reference Bulharský tribulus a Protodioscin:
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2. Wenyi Zhu, Yijie Du, Hong Meng, Yinmao Dong and Li Li – A review of traditional pharmacological uses, phytochemistry, and pharmacological activities of Tribulus terrestris
3. Milanov, S., E. Maleeva, M. Tashkov. – Tribestan effect on the concentration of some hormones in the serum of healthy subjects (1981)
4. Gauthaman, K. and Ganesan, A. – The hormonal effects of Tribulus terrestris and its role in the management of male erectile dysfunction – an evaluation using primates, rabbit and rat Phytomedicine (2008) 15: 44.
5. Justino Mameri Filho, Mauro Abi Haidar, José Maria Soares Júnior, Edmund Chada Baracat – Effects of the association of estrogen and androgen in postmenopausal women
6. Mengquan Lia Yue Guanb Jiaqi Liua Fengguo Zhaia Xiuping Zhanga Lixin Guana – Cellular and Molecular Mechanisms in Vascular Smooth Muscle Cells by which Total Saponin Extracted from Tribulus Terrestris Protects Against Artherosclerosis.
7. Zhai, Fg., Li, HZ., Zhou, FB., Lin, F., Guan, LX. – Effects of saponins of Tribulus terrestris on PPARγ and NF-κB signaling pathways expression in rat brain following cerebral ischemic injury Med Recapitulate (2015) 21: 4539.
8. Roaiah, M., El Khayat, Y., GamalEl Din, S. and Abd El Salam, M. – Pilot Study on the Effect of Botanical Medicine (Tribulus terrestris) on Serum Testosterone Level and Erectile Function in Aging Males With Partial Androgen Deficiency (PADAM). J Sex Marital Ther. (2016) 42: 297
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24. Matina Nikolova, Georgi Penchev, Svetlana Grigorova, Dimo Penkov, Hristo Hristev, Iveta Koeva – Effect of different concentrations of tribulus terrestris dry extract on histological structure of gonads and kidneys in japanese quail