Hey Serenitystar80,
Thanks for your reply 
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For other consumers who may be following your post, the link referenced above is one of Phoenix’s articles discussing memory foam’s qualities, one being its off-gassing nature. To summarize Phoenix’s concerns on the topic:
“make sure that you are choosing a high quality memory foam made by a reputable manufacturer that meets 3rd party testing standards and publishes that they have done so. There are many of these who produce high quality memory foam for a very reasonable price and it is not necessary to purchase either overpriced memory foam to get good quality or to purchase questionable qualities of memory foam which have not been subjected to testing.”
In other words, memory foam and polyfoams are safe for use when properly tested and are both popular and widely available. Look for products with the CertiPUR-US certification, a testing standard that tests for harmful substances and VOC’s but is used for polyurethane and memory foam materials.
I’m sorry to hear that you suffered a bad reaction with Dunlop latex use, Serenitystar80; that must have been frightening. What type response did you experience? Before going too far down this path, please know that TMU moderators do not give any medical advice and it would be impossible to predict through a forum whether you would have the same reaction with Talalay latex, only your Dr. could help you there. Here is a brief overview of Talalay latex that you could share with your health care provider: Talalay latex rubber is hypoallergenic and does not off-gas. During the production process, latex cores go through a five-stage fresh water washing process, removing the latex proteins, soaps, and curing agents involved in its manufacturing. Regarding Savvy Rest’s latex sourcing, Vita Talalay’s products are Oekotex 100 Class 1 certified, and Natural Vita Talalay has the Cradle to Cradle Gold and the Eco-Institut certification. Additionally, the latex is usually placed in an encasement of some type before consumer use, whether it be a simple FR sock or as a component inside the mattress cover, separating direct contact with it and the user. It is highly unlikely that a reaction would occur but again, that would depend on the sensitivities of the user.
CertiPUR-US and Greenguard certifications will ensure that the memory foam has been tested for VOC’s. You may find this Phoenix post helpful for better understanding the many certifications used for ensuring product safety; they range from organic testing standards to textiles to foams. Polyfoam and memory foam are both synthetic, man-made materials, the only difference being that polyfoam does not have the added chemicals that make it soften under pressure or heat that memory foam does. Also, memory foam is a much denser material than polyfoam, meaning there is more of it when comparing the two foams of a same size. The polyfoams used in furniture are basically the same as those used in some mattresses, only of different densities for furniture’s different functionality.
No worries on the questions; you are wise to ask them and they are valid concerns, Serenity. Brentwood Home’s memory foam topper carries both CertiPUR-US and GreenGuard Gold certifications, so it should be safe to use. According to their site, their American-made memory foam is a proprietary charcoal-infused BioFoam that “provides a better, eco-friendly alternative” to traditional memory foam. Whether or not it presents any initial off-gassing that would trigger any symptoms for you is a question t I cannot answer. I am familiar with both Brentwood Home and their parent company Avocado Green Brands and know that their company culture supports Natural and Sustainability. They do offer a one year sleep guarantee for their toppers, so if you do have problems there is a remedy. Hopefully, this helps some… 
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Sensei