Causes of ED erectile dysfunction, page 16 of 16

Sources and references (cont'd...)

(11) "Testosterone supplementation therapy for older men: potential benefits and risks." D.A. Gruenewald, A.M. Matsumoto; J Am Geriatr Soc. 2003 Jan;51(1):101-15; discussion 115;
PMID 12534854.

(12) "Effects of testosterone on body composition, bone metabolism and serum lipid profile in middle-aged men: a meta-analysis." by A.M Isidori, et al., Clin Endocrinol (Oxf). 2005 Sep;63(3):280-93;
PMID 16117815.

(13) "Effect of vitamin D supplementation on testosterone levels in men." By S. Pilz, S. Frisch, H. Koertke, J. Kuhn, J. Dreier, B. Obermayer-Pietsch, E. Wehr, and A. Zittermann. Department of Internal Medicine, Division of Endocrinology and Metabolism, Medical University of Graz, Austria. Horm Metab Res. 2011 Mar;43(3):223-5. doi: 10.1055/s-0030-1269854;
PMID 21154195.

(14) "Supplementation with vitamin D does not increase serum testosterone levels in healthy males." By R. Jorde, et al., Department of Clinical Medicine, Tromso Endocrine Research Group, University of Tromso, Tromso, Norway. Horm Metab Res. 2013 Sep;45(9):675-81. doi: 10.1055/s-0033-1345139,
PMID 23686706.

(15) "Clinical utility of vitamin d testing: an evidence-based analysis." Ont Health Technol Assess Ser. 2010;10(2):1-93. Epub 2010 Feb 1., Health Quality Ontario,
PMID 23074397, PMCID PMC3377517.

(16) "Effect of zinc administration on plasma testosterone, dihydrotestosterone, and sperm count." By A. Netter, R. Hartoma, and K. Nahoul. Arch Androl. 1981 Aug;7(1):69-73,
PMID 7271365.

(17) "Zinc status and serum testosterone levels of healthy adults." By A.S. Prasad, C.S. Mantzoros, F.W.Beck, J.W. Hess, G.J. Brewer. Department of Internal Medicine, Wayne State University School of Medicine, Detroit, Michigan, USA. Nutrition, 1996 May;12(5):344-8,
PMID 8875519.

(18) "The effect of protein intake on boar libido, semen characteristics, and plasma hormone concentrations." By G.F. Louis, et al., J Anim Sci. 1994 Aug;72(8):2038-50,
PMID 7982833.

(19) "Low protein intake: the impact on calcium and bone homeostasis in humans." by J.E. Kerstetter, K.O. O'Brien, and K.L. Insogna; J Nutr. 2003 Mar;133(3):855S-861S,
PMID 12612169.

(20) "Vitamin side effects revealed" by Frank W. Cawood, pp.51-52, ISBN 0-915099-04-7

(21) Personal experiences of the author.

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