PDF of various study abstracts:
rainforestherbs.com/tongkatali_eurycoma.pdf
Note: most of these studies were performed by the same researcher.
Enhancement of Sexual Motivation in Sexually Naive Male Mice by Eurycoma longifolia
ingentaconnect.com/content/t … 2/art00014
Eurycoma longifolia was preliminary investigated for aphrodisiac property on sexually naive male mice using both the modified runway-choice and open field methods. The animals were conditioned to seek, either an estrous female, a measure of right choice for sexual motivation or a male mouse, a measure of wrong choice, within two minutes. However, male mice which failed to response within the stipulated period were considered as having no choice.
Oral administration of 0.5 g/kg daily of different fractions of E. longifolia viz. , chloroform, methanol, water and butanol resulted in an enhancement of the sexual motivation of the animals after three days post-treatment and the effect was more prominent after eight days post-treatment.
Eurycoma longifolia Jack enhances sexual motivation in middle-aged male mice.
ncbi.nlm.nih.gov/pubmed/14964739
Eurycoma longifolia Jack was investigated for sexual motivation activity in adult, middle-aged male mice and in retired breeders, using the modified open field and the modified runway choice methods. Each mouse received 500 mg/kg of one of 4 fractions of E. longifolia Jack, viz. chloroform, methanol, butanol, and water, whereas the mice in the control and yohimbine groups received 3 ml/kg of normal saline and 30 mg/kg of yohimbine daily respectively for 10 d.
The results show a transient increase in the percentage of male mice responding to the right choice after chronic consumption of the fractions with 50 percent of the adult middle-aged male mice treated with E. longifolia Jack and yohimbine scoring the right choice after 8 and 5 days post-treatment respectively. In conclusion, this study has shown that E. longifolia Jack continues to enhance sexual motivation in adult, middle-aged male mice and in retired breeders.
Effects of Eurycoma longifolia Jack on sexual qualities in middle aged male rats
sciencedirect.com/science?_o … b24bd54003
The effects of Eurycoma longifoliaJack were studied on the sexual qualities of middle aged male rats after dosing them with 0.5 g/kg of various fractions of E. longifolia whilst the control group received 3 ml/kg of normal saline daily for 12 weeks.
Results showed than E. longifolia Jack enhanced the sexual qualities of the middle aged male rats by decreasing their hesitation time as compared to controls with various fractions of E. longifoliaJack produced 865–916 (91–96), 860–914 (92–98), 850–904 (93–99), 854–890 (95–99), 844–880 (94–98), 840–875 (94–98), 830–870 (94–98), 825–860 (94–98), 820–850 (96–99), 800–840 (93–98), 750–795 (94–99) and 650–754 sec (82–95%) in contrast to controls which produced 950 (100), 934 (100), 910 (100), 900 (100), 895 (100), 890 (100), 885 (100), 880 (100), 855 (100), 860 (100), 800 (100) and 790 sec (100%) throughout the investigation period.
Besides these, there was a transient increase in the %of the male rats responding to the right choice after chronic administration of 0.5 g/kg E. longifoliaJack, with more than 50% of the male rats scored right choice after 2 weeks post-treatment and the effect was more prominent at the dose of the observation period.
However, there was no sexual enhancement of the middle aged male rats which consumed normal saline since only 45–55% of the male rats responded to right choice throughout the investigation period. Hence, this study shows that E. longifoliaJack enhanced the sexual qualities of the middle aged male rats, further supports the folkuse of E. longifolia Jack as an aphrodisiac.
Eurycoma longifolia Jack enhances libido in sexually experienced male rats.
ncbi.nlm.nih.gov/pubmed/9353636
The effects of Eurycoma longifolia Jack were studied on the libido of sexually experienced male rats after dosing them with 200, 400 and 800 mg/kg body weight twice daily of different fractions of E. longifolia Jack for 10 days.
Results showed that E. longifolia Jack produced a dose-dependent increase in mounting frequency of the treated animals with 400 mg/kg of chloroform, methanol, water and butanol fractions resulting in mounting frequencies of 5.3 +/- 1.2, 4.9 +/- 0.7, 4.8 +/- 0.7 and 5.2 +/- 0.1, and 800 mg/kg further increased them to 5.4 +/- 0.8, 5.4 +/- 0.8, 5.2 +/- 0.6 and 5.3 +/- 0.2 respectively but there were no erections, intromissions, ejaculations or seminal emissions during the 20-min observation period which allowed for the measurement of sexual arousal reflected by mounting frequency uninfluenced by other behavioural components.
This study provides evidence that E. longifolia Jack is a potent stimulator of sexual arousal in sexually vigorous male rats in the absence of feedback from genital sensation.
