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XPI Testosyn Review

Testosyn is XPI’s test-booster which contains the usual blend of alleged test-boosting ingredients including DAA, Fenugreek, and Tribulus…

XPI Testosyn

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D-ASPARTIC ACID

D-Aspartic Acid has become extremely popular as a Test-booster in recent years, with research suggesting it is indeed effective, at least in the short term.

A 2012 study from “Advances in Sexual Medicine”, the subjects of which were infertile men (initially low Testosterone) found that 2.66g of D-Aspartic Acid was able to significantly increase Testosterone levels when measured after 90 days of supplementation. These results were in-line with those of an earlier study from 2009 in which D-Aspartic Acid supplementation raised Testosterone by 42% after 12 days in healthy men (initially normal Testosterone).

However, a 2013 study published in “Nutrition Research” found that athletes who supplemented with D-Aspartic Acid for 28 days showed no difference in testosterone levels.

The researchers in the failed study noted abnormally high levels of D-Aspartate Oxidase, the enzyme which degrades D-Aspartic Acid, indicating that prolonged supplementation in individuals with healthy Testosterone levels may cause “negative feedback”.

Testosyn contains 1560mg of D-Aspartic Acid per serving meaning two servings is required for a clinical dose.

FENUGREEK SEED EXTRACT (50% SAPONINS)

While Fenugreek (as Testofen) has demonstrated the ability to increase Testosterone in one study, it has failed to do so elsewhere under similar conditions. We discuss Fenugreek and its effects on Testosterone in depth in this article.

At this time, the reason for the discrepancy is unknown. So, as a Test-booster, the reliability of Fenugreek should be questioned. Like Tribulus, Fenugreek is an effective libido enhancer and may provide the illusion of increased Testosterone regardless of whether an actual increase occurs.

Testosyn contains 300mg of Fenugreek extract standardized for 50% Saponins. As with DAA, two servings of Testosyn provides a clinical dose of Fenugreek.

TRIBULUS TERRESTRIS

Tribulus has a well-documented history of use as an aphrodisiac and libido enhancer. Over the years, it has also gained a reputation as a Testosterone-booster, although research indicates this reputation is unwarranted.

A 2005 study, published in the “Journal of Ethnopharamcology” found that 200mg daily (60% saponin content) had no effect on Testosterone in healthy men.

These results were replicated in a 2007 study in which 450mg of Tribulus extract daily failed to influence Testosterone levels in male athletes.

Even a 2012 study, this time testing the effects of 6g of Tribulus extract on infertile men, found a less than significant trend towards increased Testosterone.

Testosyn contains 300mg of Tribulus, standardized for 40% Saponins, which is certainly enough to boost libido but will not have any effect on Testosterone.

HORNY GOAT WEED

Horny Goat Weed is generally used as an aphrodisiac and libido enhancer, but does possess mechanisms by which it may boost Testosterone. These effects are primarily attributed to the active compound, Icariin.

A 2006 study, published in the “Asian Journal of Andrology”, found that Icariin (80mg/kg) was able to increase Testosterone roughly three times as much as the control group in chemically castrated mice.

Testosyn contains 100mg of Horny Goat Weed, yielding 10% Icariin. Unfortunately, the dose used in the above-mentioned rat study used a far higher concentration.

MACA

Maca (Lepidium Meyenii) is a relative of Broccoli, indigenous to Peru, which has historically been used as an aphrodisiac. While frequently included in products aimed at increasing Testosterone, research has confirmed that the aphrodisiac effects of Maca are not caused by an elevation in Testosterone, nor does it have any significant impact on any hormones.

A 2002 study, published in “Andrologia”, found that Maca supplementation increased sexual desires, but that this effect was independent of Testosterone, which stayed the same. These findings were replicated in a 2003 study, published in the “Journal of Endrocrinology”, in which supplementation with 1.5 and 3 grams of Maca extract for 12 weeks had no influence on Testosterone levels in healthy men.

In several human studies, Maca has demonstrated a clear aphrodisiac effect when at least 1.5 grams is consumed. A 2009 study using 2400mg of Maca showed “a small but significant effect of Maca supplementation on subjective perception of general and sexual well-being in adult patients with mild ED.” A separate 2009 pilot study, this time investigating a potential effect on physical performance, found that Maca supplementation effectively improved physical performance (cycling) in trained male cyclists, while simultaneously increasing sexual desires.

Unfortunately, the 100mg dose of Maca found in Testosyn is far less than what has been shown to enhance libido and sexual well-being.

EURYCOMA LONGIFOLIA

Eurycoma Longifolia, also known as Tongkat Ali has been shown, in various studies, to increase Testosterone in male rats, but the only human studies that exist have tested the effects of Eurycoma Longifolia in infertile men, not healthy men.

A 2010 study published in the “Asian Journal of Andrology” found that supplementation with 200mg of an extract of Eurycoma Longifolia significantly improved various indications of male fertility (in humans), though the mechanism of action was unknown.

A 2012 study published in “Andrologia: Volume 44” (the same researchers from the above mentioned human study) found that men suffering from Hypogonadism (diminishing functionality of the gonads) who were treated with a 200 mg daily dose of Eurycoma longifolia extract reached normal Testosterone levels after a 30 day period. To be fair, at the start of the study about 35% of the men were showing normal Testosterone levels, and at the end about 90% showed normal levels. Still, 35% to 90% is clearly statistically significant.

With 100mg per serving, Testosyn provides half of what could be considered a clinical dose.

BORON

In the early days of bodybuilding, Boron was actually quite popular as a pro-anabolic nutrient, but that popularity faded as more and more “pro-anabolic nutrients” arrived on the scene, not to mention the discouraging findings of a 1993 study which found that daily supplementation with 2.5 mg of boron over a 7 week period failed to increase testosterone levels in men.

Recently, however, Boron is making a come-back with the same claims attached to it. A 2011 study, published in the “Journal of Trace Minerals in Medicine and Biology”, found that boron supplementation (11.6 mg daily) over a one week period was found to increase Testosterone to a statistically significant degree (28%).

The most obvious reason for the discrepancy between these two studies is that the positive (2011) study used about 4-5 times more Boron than the failed (1993) study.

Testosyn provides 5mg of Boron per serving, meaning roughly two servings would yield a similar dose to the one used in the 2011 study mentioned above.

BIOPERINE

Piper nigrum, also known as Black Pepper, contains Piperine. Several studies have found that black pepper extract, when combined with other supplements, has increased the absorption of those supplements (as measured by plasma levels). Piperine’s ability to increase absorption of other compounds is due to the inhibition of certain enzymes which breakdown most compounds, as well as the slowing of intestinal transit (increasing the amount of time these compounds are exposed to the possibility of uptake).

Bioperine has no influence on Testosterone. It just serves as a means of enhancing the absorption of the other ingredients in Testosyn.

THE BOTTOM LINE

Testosyn definitely has the right ingredients to boost/optimize Testosterone levels. The most likely individuals to benefit are those with initially low Testosterone levels, as most of the ingredients have only been shown to boost Testosterone under those circumstances. Ideally, users should look to take two servings daily to ensure clinical doses of key ingredients such as DAA and Fenugreek. At a little under $1 per serving, two servings may actually be a feasible option.

Still not sure which test-booster is right for you? Check out our Best Testosterone Boosters List!

References

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