Hi BubbleGeoff,
Nontoxicbeds is the online site for Strobel.
In my conversations with them they were not particularly transparent (see post #4 here) and some of the information on the Strobel site is also not particularly accurate IMO (see some of the comments in post #2 here and post #39 here). A forum search on Strobel (you can just click this) will bring up more information about them as well.
Their latex appears to be 100% natural Dunlop but they wouldn’t be among my first choices for an online purchase for reasons of transparency, the lack of firmness choices available, their “fear mongering” and somewhat inaccurate marketing strategies, and also because they are not particularly good “value” compared to many other latex options that are available.
The best place to start your research is the tutorial post here which has all the basic information, steps, and guidelines that can help you find the mattress that is best for you.
The post that dn was referring to (I didn’t see his post until after I had finished my reply) that can help you decide “how safe is safe enough for me?” is post #2 here and the links to other forum posts it leads to.
Phoenix