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Vespa Gels claims to improve endurance performance by improving fat burning. However the science does not seem to back this up, with no human studies that show improved endurance. The few animal studies that exist generally use vastly higher doses, the equivalent of 100-500 packets of Vespa gel. So why does Vespa seem so popular with top ultra-endurance athletes?

* [http://www.vespapower.com/ Vespa gel ] contains Giant Hornet Saliva (GHS) extracted from the insect larvae and each standard gel packet contains 100mg of amino acidsthe saliva<ref name="VespaGel"/>. This would provide about 57mg of amino acids. Note that while Vespa is a gel like product, it is not an [[Comparison of Energy Gels| energy gel]] and does not provide a meaningful source of fuel. * Another company produces [http://www.vaam-power.com/ Hornet Juice ] which contains 17 amino acids in the ratio found in the Giant Hornet Saliva. This mixture is often referred to as VAAM (Vespa Amino Acid Mixture).

The proposed Mechanism of Action behind GHS and Hornet Juice is that it triggers a switch to burning fat for exercise rather than carbohydrate. This is not how the mixture works in the Giant Hornet, which primarily uses carbohydrate and the for fuel. The Giant Hornet gets over half its calories from amino acids for fuel, not a tiny amount that acts as some type of catalyst.

The science behind VAAM is rather limited, with no studies that show an improvement in human endurance performance, and one study showed a reduction in fat burning. There is only one study that used GHS. Here is a brief summary of the studies that are available.* When untrained, fasted mice were put in a pool and forced to swim to avoid drowning, VAAM improved swimming times over water, glucose or casein (a milk protein)<ref name="VAAMSwimMice"/>. This is the only study that shows improved endurance rather than other blood markers. The VAAM given was equivalent to 500 about 900 packets of Vespa Gel (700mg/Kg or 52.5g for a 150Lb/75Kg human).

* In untrained subjects, 5.7g VAAM slightly reduced the [[Rating of Perceived Exertion|RPE]] during 60 minutes of cycling compared with a non-calorie control. However, the rate of fat burning was actually higher in the placebo case than with VAAM<ref name="Demura-2003"/>. (The study does some ugly analysis to show that because the fat burning started even lower for the placebo, it went up relatively more than the VAAM.) The study used the equivalent of about 100 packets of Vespa. * Taking 10.8g of VAAM with 38g of sugar increased markers of ketogenesis during 45 minutes of exercise in humans compared with 48.8g sugar<ref name="VAAMketone"/>. Note that the study did not show that fat burning was increased, just markers of ketogenesis. This is the equivalent of 108 about 190 packs of Vespa Gel.* Taking VAAM (3g/day) & exercise or placebo & exercise for 12 weeks in previously sedentary elderly women produced a slightly greater improvement in fitness and body fat<ref name="SasaiMatsuo2011"/>. This is the equivalent of 30 about 50 packs of Vespa Gel per day.* An unpublished study (available as an abstract only) showed that 10g/70Kg of VAAM produces a slight reduction in heart rate during 30 minutes of exercise compared with casein protein<ref name="VAAMUnpublishedHR"/>. This is the equivalent of 100 about 175 packs of Vespa Gel.

* In untrained subjects==Publication Bias?==[http://en.wikipedia.org/wiki/Publication_bias Publication bias] is where the studies that support an idea are published and those that are unsupportive are ignored. It is hard to know when publication bias occurs, though there are some techniques such as the [http://en.wikipedia.org/wiki/Funnel_plot funnel plot] that can help when there is plenty of comparable research available. However, looking at the research that has been performed on VAAM reduced , it seems strange that the [[Rating obvious test of a potentially endurance performing supplement has not been performed. That obvious test is to check if endurance is actually improved, such as a treadmill test to exhaustion or a simulated time trial. This type of Perceived Exertion|RPE] but no other measures during 60 minutes test would be easier to perform than some of the existing research, and would give a more definitive answer. That, combined with the egregious bias shown in the cycling compared with a non-calorie controlstudy<ref name="Demura-2003"/>above, suggests to me some level of publication bias.

There are a large number of highly publicized endorsements of Vespa Gel, including a number of top athletes. There are a number of explanations for this.* The anecdotal evidence may be misleading. Some of the anecdotes are based around athletes completing ultramarathons on fewer calories than is normally expected. However, for my 100 mile PR (16 hours) I only consumed about 2,700 calories, which is also far less than is normally expected.* There's an old saying that "absence of evidence is not evidence of absence." It is possible that Vespa Gel does improve endurance performance, but the supporting scientific studies have not yet been performed. While this is possible, this seems unlikely to me given the studies that have been published and the tiny amounts of the saliva that are included in each gelpacket. * The benefit of Vespa may be due to the placebo effect, especially given the high cost which generally improves the effectiveness of a placebo. Some of the reports of improved performance with Vespa are when it's taken with large amounts of protein, which should negate any benefit, strongly suggesting a placebo effect. To understand how widespread the anecdotal evidence could be for a placebo, you can look at [http://en.wikipedia.org/wiki/Homeopathy Homeopathy] which is generally accepted as quackery. * The way Vespa is used may result in indirect performance improvements. Vespa recommends a much lower level of calorie intake when using the Vespa gels than is common in ultra-endurance events. It may be that athletes that use Vespa gels may consume a more effective level of fueling that promotes better performance.

* It's hard to recommend taking Vespa gel given it costs $6.75 per packet ($69 for 12) and has little scientific support. To get the amount that improved performance in untrained mice would require eating 500 900 gels and cost $25,875175. On the other hand, there is little in the Vespa Gel that could cause a problem, so other than the cost it should be low risk. Vespa Gel may be a placebo, but I would argue that a good placebo is worth its weight in gold.* Using [http://www.vaam-power.com/ Hornet Juice] is cheaper at $3 per serving and each serving provides 37 times more VAAM than Vespa Gels. I tried Hornet Juice a number of times on long (24-30 mile) training runs and noticed no difference, but as noted above, Hornet Juice and Vespa Gels are not identical in their ingredients.