Potion of healing

A potion of healing is a potion of red glimmering liquid that can restore hit points when it is drunk.

Tal'Dorei
A rare swamp fungus called the queenscap is a reagent used in the brewing of potions of superior healing; as of 812 PD the fungus had been harvested almost to the point of extinction in the K’Tawl Swamp but the mushrooms were still available around the village of Bronbog.

Issylra
Mertin Cyndrial claims that most potions one would see throughout the world in some way, shape, or form originated in Vasselheim, including healing potions.

Wildemount
Madam Musk in Asarius produces potions of healing using tumor moss collected nearby.

Marquet
According to Advik, an herbalist named Amarash lives near the Heartmoor of the Oderan Wilds and knows a secret family recipe for healing potions. These potions have the same healing properties but a different brackish red color to them.

Properties
Drinking a potion of healing restores an amount of hit points that varies with the potion's potency and rarity. It normally takes one action to drink a potion; however, the Critical Role games use a homebrew rule making it possible to drink one as a bonus action, although feeding one to another player still takes an action. The Critical Role: Tal'Dorei Campaign Setting offered this homebrew rule as a suggestion to help speed up combat with larger parties, and introduced "Rapid Quaffing" as an optional feat allowing characters to not only drink potions as a bonus action but also gain advantage on saving throws triggered by ingesting alcohol and dangerous substances.

Uses
CritRoleStats has a record of all potions of healing consumed in each campaign. Here is the tracker for Campaign One, and here is the tracker for Campaign Two.

Trivia

 * Matt filled several small bottles with the corresponding amount of red dice to hand to the players to represent the healing potions they carry. When a player wants to use the potion, they roll the dice by emptying the bottle, then return it to the Dungeon Master.