Hard Wood Tonic References

(1) Erectogenic and neurotrophic effects of icariin, a purified extract of horny goat weed. Alan W Shindel, Zhong-Chen Xin, Guiting Lin, Thomas M Fandel - J Sex Med 2010

(2) Human Safety and Pharmacokinetics Study of Orally Administered Icariin. E. Sherwood Brown, Collette Bice, William C. Putman, Richard Leff – Nat. Product Communications 2019

(3) Icariin Improves Age-Related Testicular Dysfunction by Alleviating Sertoli Cell Injury. Chaoqi Liu, Yaoyan Dun, Jie Wu, Changcheng Zhang, Ding Yuan - Front. Pharmacol 2020

(4) Flavonoids: an overview. A. N. Panche, Diwan, S.R. Chandra - J Nutr Sci. 2016

(5) Phytoandrogenic properties of Eurycoma longifolia as natural alternative to testosterone replacement therapy. A George, R Henkel - Andrologia 2014

(6) Standardised water-soluble extract of Eurycoma longifolia, Tongkat ali, as testosterone booster for managing men with late-onset hypogonadism. M I B M Tambi, M K Imran, R R Henkel - Andrologia 2012

(7) Efficacy of Tongkat Ali (Eurycoma longifolia) on erectile function improvement. Surachai Kotirum, Shaiful Bahari Ismail, Nathorn Chaiyakunapruk - Complement Ther Med. 2015

(8) Randomized Clinical Trial on the Use of PHYSTA Freeze-Dried Water Extract of Eurycoma longifolia for the Improvement of Quality of Life and Sexual Well-Being in Men. Shaiful Bahari Ismail, Wan Mohd Zahiruddin Wan Mohammad, Annie George - Evid Based Complement Alternat Med. 2012

(9) The effect of Eurycoma longifolia on sperm quality of male rats. Kit-Lam Chan, Bin-Seng Low, Chin-Hoe Teh, Prashanta K Das - Nat Prod Commun 2009

(10) Physiological aspects of male libido enhanced by standardized Trigonella foenum-graecum extract and mineral formulation. Elizabeth Steels, Amanda Rao, Luis Vitetta - Phytother Res 2011

(11) Effects of a purported aromatase and 5α-reductase inhibitor on hormone profiles in college-age men. Colin Wilborn, Lem Taylor, Chris Poole, Cliffa Foster, Darryn Willoughby, Richard Kreider - Int J Sport Nutr Exerc Metab 2010

(12) Citrulline and nitrogen homeostasis: an overview. C Breuillard, L Cynober, C Moinard - Amino Acids 2015

(13) Influence of L-citrulline and watermelon supplementation on vascular function and exercise performance. Arturo Figueroa, Alexei Wong, Salvador J Jaime, Joaquin U Gonzales - Curr Opin Clin Nutr Metab Care 2017

(14) Citrulline stimulates muscle protein synthesis in the post-absorptive state in healthy people fed a low-protein diet. Marion Jourdan, K Sreekumaran Nair, Rickey E Carter - Clin Nutr 2015

(15) Ameliorative effects of stinging nettle (Urtica dioica) on testosterone-induced prostatic hyperplasia in rats. A Nahata, V K Dixit - Andrologia 2012

(16) Efficacy and safety of a combination of Sabal and Urtica extract in lower urinary tract symptoms. Nikolai Lopatkin, Andrey Sivkov, Sandra Schläfke, Petra Funk - Int Urol Nephrol 2007

(17) Side-effect profile of sildenafil citrate (Viagra) in clinical practice. S G Moreira Jr, R E Brannigan, A Spitz, F J Orejuela, L I Lipshultz, E D Kim - Urology 2000

(18) Four-Year Review of Sildenafil Citrate. Andrew R McCullough - Rev Urol. 2002