Methol and Camphor
Sombraman said:
Retrospective studies with a camphor-based product (Vicks VapoRub) have not shown any developmental toxicity associated with exposures during pregnancy.
I actually don't care about studies during pregnancy for camphor, there are basic toxicity studies "Some sources suggest that it is possible that epileptic-like seizures may be caused through exposure.". I would avoid something that can trigger epileptic-like seizure, admittedly the dosage that the mother is exposed to is unlikely to be suffficient to be a concern to the mother, I would still err on the side of caution when it came to saying the effect on the fetus - there just aren't the volume of studies. The long term effects of a substance that can trigger epileptic-like seizure has on developing organs can't be decided by a Vicks Vaporub study that I suspect only checked that the baby came out OK. I think most of the epileptic-like seizure studies relate to ingestion, but then if you are concerned about alcohol applied to the skin, why not be concerned about something known to produce epileptic-like seizure applied to the skin? Isn't menthol a form of alcohol? It's been a while since I did any organic chemistry at university, but I seem to remember substances ending in -ol were all alcohols?
Personally, I would be cautious about something that says "not to be used on infants under the age of 6 months", which seems to be the common Vicks Vaporub recommendation, which contains a lot of methol and camphor.
It is all related to the volume consumed. Even though the palms of the hand and soles of the feet have a thicker layer of skin on them than elsewhere, they contain a lot more sweat glands so things are absorbed a lot faster than elsewhere (simple experiment run a garlic clove on the soles of your feet, it will come out in your breathe as if like you ate it, rub it on the side of your leg and the effect is not nearly as dramatic). I think a massage therapist working with substances with their hands has a much higher exposure rate than anecdotal studies for something used on the general public in the usual manner - MTs aren't exposed to the product in the usual manner. A member of the general public will use it while pregnant for a few days while they have a bad chest/back whatever, and they will wash their hands pretty quickly to avoid getting it in their eyes, they're not exposed to it for 9 months, day in day out.
The other thing to consider while pregnant, your sense of smell goes all over the place - one day something is OK, the next it smells terrible. I'd recommend avoiding relying on any one scented product for work while pregnant (natural/synthetic/just for scent/theraputic benefits) because one day you may find it smells ghastly and you can't work with it. Whatever you decide to continue working with it, make sure you get a few options so you can rotate through so you can reduce exposure. I'd say go for something like jojoba as often as possible and just bring in the heavy duty stuff when absolutely required, rather than all the time.
Here's a link to an AMTA article about massage creams and lotions making the MT sick http://www.amtamassage.org/journal/jobmakeyousick.html If it can do that to the MT, what might it be doing to the fetus?