Information and Education Can Be Relayed

You don't have to market to sell something. While that seems odd, and even contradictory, consider that consumers no longer want to be talked at or sold to, rather they want to be the chooser, and if you can educate them, they just might choose you.

Think back to the last few purchases you made. You probably purchased because you needed (or thought you needed) the item in question. We purchase, usually, to fill needs. If your podcast can educate listeners as to thier needs for your product, without ever mentioning the product, then you've created a need where there once was not one. If your company sponsor's the podcast, they'll be reminded on open and close of your product, it's really not beneficial to actively market during the podcast.

Ask about having intros and outros created to market your product, and keep the actual podcast dedicated to general education. People trust those who help them. You have a wealth of knowledge on your subject matter, market that knowledge.