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1 Tongkat ali extract, especially 1:200 extract, has a long history of being forged and laced with chemicals and substances like kratom.

2 Darrell W. Brann, and Virendra B. Mahesh, Excitatory Amino Acids: Evidence for a Role in the Control of Reproduction and Anterior Pituitary Hormone Secretion

3 B. Alvarez, R. Radi, Peroxynitrite reactivity with amino acids and proteins, Amino Acids December 2003, Volume 25, Issue 3, pp 295-311

4 Effectiveness of oral L-arginine in first-line treatment of erectile dysfunction in a controlled crossover study., Europe PubMed Central, Clinical Trial, Journal Article, Randomized Controlled Trial, Urologia Internationalis [1999, 63(4):220-223].

5 D. Gianfrilli, R. Lauretta, C. Di Dato, C. Graziadio, C. Pozza, J. De Larichaudy, E. Giannetta1, A. M. Isidori and A. Lenzi, Propionyl-L-carnitine, L-arginine and niacin in sexual medicine: a nutraceutical approach to erectile dysfunction, Wiley Online Library, Andrologia, Volume 44, Issue Supplement s1, pages 600-604, May 2012.

6 Alvin M. Matsumoto , and William J. Bremner, Modulation of Pulsatile Gonadotropin Secretion by Testosterone in Man