The study looked at 109 men between the ages of 30-55. Many of the men complained of a less than satisfactory sex life. But close to 70% of them tested out normal on the typical questionnaires used to define erectile dysfunction. In other words, in this group of relatively young men, the erectile/libido problems were not severe for most of them. That's important for interpreting the results. Because any improvement in a group of men whose problems were not all that bad may indicate that men with a greater level of the problem might respond even better.
The researchers gave half of the men 300 mg/day of an aqueous extract of the root of the herb eurycoma longifolia, also known as tongkat ali. Tongkat ali has had a reputation in Malaysia for being an effective aphrodisiac. They gave the other men a placebo. The experiment went on for 12 weeks. Here's what they found.
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You can buy tongkat ali online. I recommend taking one to two capsules of a product called Natural Testosterone Booster — Indonesia Tongkat Ali Extract. It is a 1:100 extract strength and contains 400 mg per capsule – a little bit more than was used in this study. If it is like most herbs, a higher dose may be necessary for some men to get the full effect. You can buy it at Amazon.com.