Best Ad Network With Contextual/Topic Targeting Capabilities?

I am hoping someone here can help! I would appreciate it very much!

We are currently advertising with Tap Native with great results. Because we are able to target consumers based on condition like pain, anxiety, arthritis, and other conditions.

So, my question is what ad network out there offers the BEST targeting capabilities by contextually targeted content, so we can target people who are reading pain or anxiety related content?

Just so you know, we are advertising CBD and Joint Pain products.