The problem with that or with making a resource hard to farm is that players will optimize the fun out of gameplay. You'll inevitably get players that walk back to the healing station after every encounter or farm that resource for hours. Neither of which is fun gameplay.

I'm combining the two in my game. You can pick up healing items at various points and, when you use them, they re-appear where you originally found them so you can grab them again if you're willing to do a bit of backtracking.

https://mastodon.gamedev.place/@overclockedabacus/114031094734073547