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Independent studies have suggested that Tribulus terrestris extract does increase testosterone levels, though leaving them in the normal range, which is not thought to increase muscle development.
http://www.supplementwatch.com/suplib/supplement.asp?DocId=1263&templateId=100
one recent study found that T. terrestris caused no increase in testosterone or LH in young men
V. K. Neychev and V. I. Mitev (2005). "The aphrodisiac herb Tribulus terrestris does not influence the androgen production in young men". Journal of Ethnopharmacology 101 (13): 319323.
The following ingredients/products were studied with successful
results in recent months, and the accompanying data
was presented at the International Society of Sports Medicine
(ISSN) conference in Las Vegas, June 15-17th 2006. For those
unfamiliar, the ISSN is an independent organization dedicated
to advancing sports nutrition research. It is headed by Jose
Antonio, Ph.D., FACSM, CSCS, a widely published industry
author and researcher, with a background in skeletal
muscle plasticity, endocrinology and metabolism. The ISSN is perhaps
the most recognized group of its type at the present time, and has highlighted
the work of many well-respected scientists in the field. It can, likewise, be
considered at the current forefront of sports nutrition research.
SupplementWatch and Source One Global
Partners produced a study on Eurycoma
longifolia, commonly known as Tongkat
Ali or Longjack. Thirty male subjects
were recruited from a 24-hour mountain
biking event, and asked to provide saliva
samples before and after each lap so they
could measure cortisol and testosterone
levels. The subjects completed 4 laps
(14.91 miles/lap) and provided 8 saliva
samples over a 24h period. The subjects
(15 in each group) consumed either
100mg of a standardized Longjack
product or a placebo approximately 30
minutes before the event. The results
were as follows.Cortisol levels were 32.3%
lower in the group taking Lockjack.
Testosterone levels were also 16.4% higher
in those taking Longjack compared to
placebo. These results suggested that
Longjack can help maintain a hormonal
environment that favors anabolism by
lowering cortisol levels and increasing
testosterone levels during intense
endurance exercise.
