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2 https://www.Semenax.com

Source: Dr. Anuradha Kulkami, Vedic Lifesciences:
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https://www.ncbi.nlm.nih.gov/pubmed/8510302

3
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https://www.ncbi.nlm.nih.gov/pubmed/10444124

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https://www.jsm.jsexmed.org/article/S1743-6095(15)32832-0/pdf

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https://www.sciencedirect.com/science/article/pii/S0889852907000229

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http://www.altmedrev.com/archive/publications/9/1/4.pdf

8
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https://ods.od.nih.gov/about/dshea_wording.aspx

9
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https://www.ncbi.nlm.nih.gov/pubmed/19998572

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https://www.ncbi.nlm.nih.gov/pubmed/20493463

11 
Fleshner N, Harvey M, Adomat H, Wood C, Eberding A, Hersey K, Guns E: Evidence for contamination of herbal erectile dysfunction products with phosphodiesterase type 5 inhibitors. J Urol 2005, 174(2):636–641.

https://www.auajournals.org/article/S0022-5347(01)68343-5/ppt

12
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https://www.academia.edu/24814117/

13
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https://www.ncbi.nlm.nih.gov/pubmed/12789389