There's scientific proof for you. empiric view of one. And that does not seem to work well eitherNot really!
I have been using it(same brand) for several yrs and it is just not as effective as DEET but good enough for me. When the female mossie wants my blood for her to develop eggs, there is no stopping!
When Zika, Dengue or Malaria are endemic, use DEET or Picaridin. Avoid Cactus Juice and other psuedo potions/lotions that sound too good to be true. Even Avon added Picaridin to Skin-so-soft after the "natural" chemical free nonsense they were selling turned out to attract more bugs than it repelled.