I have used WD 40 since the early 1960s, in large quantities .I was an 
electrical maintenance and trouble shooter in the Marine trade,with side 
experience in automotive electrics,using same.As we all know ,there is nothing 
quite like salt water to play havoc with electrical components.We found WD40 
valuable in combatting same.There were many times when we nearly bathed in 
it,and I still have it in my workshop,wouldn't be without it.So far I can't say 
I have had any noticeable side effects .I wouldn't recommend drinking it tho.
Harold