Source: Player's Handbook

Potion, Common

This potion is a magic item. As a Bonus Action, you can drink it or administer it to another creature within 5 feet of yourself. The creature that drinks the magical red fluid in this vial regains 2d4 + 2 Hit Points.

Source: Dungeon Master's Guide

Potion, Rarity Varies

You regain Hit Points when you drink this potion. The number of Hit Points depends on the potion’s rarity, as shown in the table below.

Whatever its potency, the potion’s red liquid glimmers when agitated.

Potion HP Regained Rarity
Potion of Healing 2d4 + 2 Common
Potion of Healing (greater) 4d4 + 4 Uncommon
Potion of Healing (superior) 8d4 + 8 Rare
Potion of Healing (supreme) 10d4 + 20 Very Rare