You know, the base potion of healing should be something basic to have to avoid get stuck and is nothing game breaking, it cost 25gp to craft one even with materials, is not free, and rarely worth to use in combat with your action. Aside, we have in Xanathar the prices for ...
If you want to disincentivize yoyo healing have the first heal of any kind at 0 hp simply stabilize the character (no more death saves, but still at 0). The second heal would be the one that actually regains hp If it takes two heals and two actions (spell, potion, pala...
This seemingly innocent magic item has a 1 in 100 chance of doubling the strength of any potion stirred with it. (And home alone, you can easily roll the required number each time, right?) Just imagine what drinking a double-strength permanent potion of invulnerability can do for you. To...