Any love for vitamin products?

No, I don't mean questionably backed vitamin supplements. I mean a product that solves a soft user problem or nag, rather than a huge pain (painkiller product) for a user.

I hear advice alot around finding and building a painkiller product as it's more likely a user will pay for it.

But what about vitamin products? Does anyone have experience building and marketing them sucessfully? Did you use a subscription payment model or something else? Keen to hear everyone's thoughts.

For context, I'm building Flowful which produces procedurally generated, customizable focus music. It's never going to save any lives, but hopefully help people over time, while solving a bunch of small problems in existing solutions like Youtube videos or Spotify playlists.