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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.
* 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.
* The benefit of Vespa may be due to the placebo effect, especially given the high cost which generally improves the effectiveness of a placebo<ref name="WaberShiv2008"/>.
* 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.
=Recommendations=
=References=
<references>
<ref name="WaberShiv2008">{{cite journal|last1=Waber|first1=R. L.|last2=Shiv|first2=B.|last3=Carmon|first3=Z.|last4=Ariely|first4=D.|title=Commercial Features of Placebo and Therapeutic Efficacy|journal=JAMA: The Journal of the American Medical Association|volume=299|issue=9|year=2008|pages=1016–1017|issn=0098-7484|doi=10.1001/jama.299.9.1016}}</ref>
<ref name="VAAMMiceFat">JAIRO | The Activation of Fatty Acid Metabolism by Vespa Amino Acid Mixture (VAAM)and Related Nutrients during Endurance Exercise in Mice http://jairo.nii.ac.jp/0025/00000958/en </ref>
<ref name="VAAMSwimMice">Effects of <I>Vespa</I> Amino Acid Mixture (VAAM) lsolated from Hornet Larval Saliva and Modified VAAM Nutrients on Endurance Exercise in Swimming Mice https://www.jstage.jst.go.jp/article/jspfsm1949/44/2/44_2_225/_article </ref>