Formulas

Sold by Xu Dog only from the 2nd cycle (New Game+), seen at Crouching Tiger Temple > Cellar.

Sold by Xu Dog (Crouching Tiger Temple > Cellar, later Zodiac Village) from the start of Chapter 2.

Defeat the frog chief Lang-Li-Guhh-Baw in the flooded ravine below Sandgate Village > Village Entrance (drop down to the left of the shrine). This is Xu Dog's first request and also unlocks medicine making.

Golden box at the end of the downhill path from the Bitter Lake > Precept Corridor shrine (meditation cushion on the left just before it); also holds 3 pills.

New Thunderclap Temple > Temple Entrance: go straight through the wooden temple building, up the stairs, take the left stairs down, enter the next building and climb to its top floor; small golden box at the end of the wooden bridge next to Ma Tianba (the horse); also holds 3 pills.

Sold by Xu Dog from the start of Chapter 3 (after Yellow Wind Sage).

Given by Xu Dog during Chen Loong's questline: after defeating Chen Loong at Bitter Lake > North Shore, talk to Xu Dog in Crouching Tiger Temple > Cellar (he also hands over the Special-Made Bone-Strengthening Pellet).

Webbed Hollow > The Verdure Bridge: cross the vine planks and keep left to the side room reached after the lantern ('Great joy') cutscene; first chest on the left (also holds Enhanced Ginseng Pellets).

Webbed Hollow > The Verdure Bridge: cross the vine planks, go right and drop twice, climb the steps on the left to the platform with a Luojia vine and a Scorpion Prince, continue up the stairs ahead-right and open the box in the small house on the right (past the spider cocoons and the village up the stairs).

Purple Cloud Mountain (Chapter 4 secret area) > Cloudnest Peak: from the shrine go right through the alley gate; small golden container in the small house ahead-right (also holds 3 pills).

Sold by Xu Dog from the start of Chapter 4 (after Yellowbrow).

Bishui Cave (Chapter 5 secret area), near the Purge Pit shrine: in a chest before the shrine according to some guides, on the ledge behind the shrine (jump, then a heavy attack in mid-air) according to others.

Sold by Xu Dog from the start of Chapter 5 (after Hundred-Eyed Daoist Master).

Automatic reward for defeating Supreme Celestial Inspector (Wang Lingguan) at Foothills > Verdant Path, start of Chapter 6.

First clear of the Gauntlet of Legends challenge "Four Loongs of Four Waters" (Red, Black, Cyan and Yellow Loong); also gives 4 pills. Challenge mode unlocks after the first game clear.