Sunday, Sep 30, 2007 at 22:09
Peter, the supplement you refer to is Vitamin B1 (Thiamine Chloride). Lots of people swear by it. My wife, who is attacked by mosquitoes and sandflies every time she steps outside has tried it at length, with no result.
I did an extensive web based search for scientific evidence of it's effect on insects. I found that despite a number of tests, none have shown any benefit in taking B1. Despite this, many people swear by it, so it is worth a try if you are into that sort of thing.
On a recent trip to the Gulf (fishing), Kathryn tried everything. Apart from Bushmans 80% (which we are reluctant to use for long periods), Dettol, metho and Baby oil in roughly equal proportions is as effective as any, but far from perfect. It has the side effect of leaving you slick and oily all day - not real comfortable, and it needs to be continually applied during the day. We actually suspect it works because the sand flies (or mosquitoes) get stuck in the oil and spend their time trying to escape, rather than biting.
I extended my web based search to find testing of reppelents, trying to find scientific tests, not anecdotes. In controlled tests, the only really effective personal repellents are DEET and Picaridin based products. DEET is the best known and most widely accepted as a successful product.
In a
test sponsored by the Australian Army, DEET 80% (Bushman's) was the only tested product to repel all types (4 mosquito families were used I think) for over 6 hours. Some other products repelled some of the mosquito types for extended periods, but not all. It needs to be noted though that the strongest readily available product tested (other than 80% DEET Bushmans) was 12% DEET in Aeroguard Tropical.
In general, I found that research showed that concentrations of DEET below about 6% are not very effective. Above 6%, the higher the concentration of DEET, the longer the protection. That is you need to apply regularly, depending on the insect level and DEET concentration in the product you use.
Other research from Canada and the USA suggests that higher levels of DEET are more effective, but that above 30 to 40%, there is little improvement in repellent success for higher DEET concentrations. In Canada it is illegal to have more than 30% DEET in any product due to health concerns. This is the only country I can find with such regulation. The US FDA says they can find no health risk from DEET>
So, a product with 30 to 40% DEET seems (based on my reading) to be ideal. But there is no such product available in Australia. Once you drop below Bushmans 80%, the next I am aware of is Bushman's 20%. then you come down to a lot of 'Tropical Strength' products around the 12% level.
I recently picked up some info (not substantiated) that Bushmans is working on a product that will have 40% DEET. Based on my research it could be a winner if it becomes readily available.
In the meantime Bushmans 20% or any of the 12% odd products are as good as you will get. Just be prepared to apply every couple of hours depending on the variety of mosquito and how much you are getting bitten.
All this is based on reading available information - not on any personal expertise in the field. Also, Ive written this from memory based on my research- but I'm confident that this post represents my findings.
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Follow Up By: Willem - Monday, Oct 01, 2007 at 09:04
Monday, Oct 01, 2007 at 09:04
Hi Norm
I am not affected by insect bites that much and neither is my wife Judith. We do however carry Bushmans with DEET 80% and find that it works quite
well to repel the mosquitoes and sandflies. Lazy Bushflies however, always find spot that you haven't covered with the Bushmans though...lol
Cheers
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Follow Up By: The Explorer - Monday, Oct 01, 2007 at 10:09
Monday, Oct 01, 2007 at 10:09
Yes, Bushmans is very good. I am not sure if they have changed the formula but a few years ago you had to be a bit careful how you used it (roll on bottle) as it would melt plastic. Destroyed a few pairs of safety glasses with it! I have the spray can variety now - seems less potent at melting plastic -
well the Prado hasnt melted yet:)
Cheers
Greg
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