Another of the big trends nowadays, not only when talking about chewing gum, but also in the food industry and even further, is the “natural” claim.
In ISM’20 I found CHEWSY (www.chewsygum.com). Thus gum in produced in China by a UK-based company. It claims that contains only xylitol as sweetener (no sugar, no aspartame) and that it is made using natural gum base (“plastic-free gum base” as they define it). I have some personal issues though, accepting the claim of “biodegradable”. The fact of being natural does not bring automatically the biodegradability. But it would be great if the product really degrades after some short period of time. Please allow me to be a bit skeptical on this matter because the products that have been launched in the market with this claim, have not really succeeded, for one reason or the other.
In any case, good proposal that deserves to be followed, which I will do with interest.
Chewing Gum Consultant 
I don’t believe a natural gum base is safer than artificial gum base because the impurities in natural gum base is uncontrollable. And, if its cost is higher, it means it is not sustainable than artificial one.