I was advised by my IVF nurse and doctor to be very carefull about chemicals. Their advise to me was simply: quote: Remember whatever you put onto your body and whatever you breath goes straight into your blood system and to the baby even in small amounts. So they said in their opinion do not dye hair , do not do nails not even nail polish(remember you must use accetone to take it off), no eye drops , no nasal sprays, do not use anything with mineral oils and whatever you do do not use oven cleaners - oven cleaners are really really toxic and have been known to cause m/c. Whether they are right or not makes no difference to me - after alot of research into the matter and alot of discussions with other doctors I beleive in their opinion and would not take the risk - but on the other hand I have had friends that have done all the above even smoked and drank and had normal healthy babies - but for me i will take the safe route and go organic and natural - big life change but won't kill me.