It is actually made non-toxic with the notion of people licking it in mind. It's not like it is just regular glue or a toxic adhesive. But I get what you mean.

It is actually made non-toxic with the notion of people licking it in mind. It's not like it is just regular glue or a toxic adhesive. But I get what you mean. I don't lick them either. I don't get why people are even bothering with the point about DNA on the envelope though. Anyone who has ever mailed out lots of handwritten letters has used a moisture pen. You can go buy them for a few dollars at any office supply store. I use one to seal close to a hundred envelopes for the stamps every Monday at work.