- Training Reference Notes

Health and nutrition education and training for Quest stockists and consumers.

Produced by the Nutrition Department, Quest Vitamins Limited,
Birmingham, B7 4AP, Tel: 0121 359 0056, Fax 0121 359 0313, e-mail:
© Quest Vitamins Ltd. 2001 - No reproduction of material without permission from Quest Vitamins Ltd.



Impotence is the inability of the male to perform sexual intercourse

Impotence results from physical causes such as structural abnormalities of the genital organs; decreased activity of the thyroid and pituitary glands; Anaemia or other debilitating diseases; Fatigue; or chronic poisoning (drug addiction or Alcoholism). However, the most frequent cause of impotence is thought to be psychological in origin. Neuroses arising from negative attitudes toward interpersonal relationships established during childhood are sometimes related to habitual impotence.


Ginkgo biloba(3)
Sarsaparilla (4)
Saw Palmetto


Coenzyme Q10
B Complex
Vitamin E (1)
Zinc (2)


1. Rimm EB, et al. Vitamin E consumption and the risk of Coronary Heart Disease in men. New Eng J Med 1993; 328:1450-56.
2. Netter A, et al. Effect of Zinc administration on plasma testosterone, dihydrotestosterone and sperm count. Arch Androl 1981; 7:69-73.
3. Sohn M, Sikora R. Ginkgo biloba extract in the therapy of erectile dysfunction. J Sec Educ Ther 1991;17:53-61.
4. Kiangsu Institute of Modern Medicine. Encyclopedia of Chinese Drugs. Shanghai, People’s Republic of China, 1977.