Love Potion

Ingredients: Ashwinder eggs. Causes the drinker to fall in love. During his Valentine's Day event, Lockhart suggested that the students ask Professor Snape to knock up a quick Love Potion for them. Professor Snape did not approve. Weasleys' Wizard Wheezes sell their own range of Love Potions, which - as Ron can testify to - really do work.

Mandrake Restorative Draught

Ingredients: Mandrake. This is used to revive people who have been petrified. It was particularly useful when the Basilisk was released from the Chamber of Secrets and petrified a number of students.

Memory Potion

Ingredients: Jobberknoll feathers. The effect of this in not known, but it is likely that the potion is used to give the drinker improved access to their memories.

Mrs Scower’s Magical Mess Remover

Cleaning solution favored by Argus Filch.

Pepperup Potion

This relieves the symptoms of colds and flu, although it doesn’t seem to actually provide a cure. It has the side-effect of causing steam to come out of the drinker’s ears for several hours after imbibing it.

Photograph Developing Fluid

Even though Colin Creevey has a Muggle camera, he was told that he could still produce wizard-style moving photographs by developing them in the correct fluid.

Polyjuice Potion

Ingredients: Fluxweed, Horn of bicorn, Knotgrass, Lacewing flies, Leeches and Skin of boomslang. This potion allows the drinker to assume the appearance of another person. The effect lasts for an hour, but as Bartemius Crouch Jr showed when impersonating Alastor Moody, repeat doses can be taken indefinitely. In addition to the standard ingredients listed, this potion also requires a part of the person you want to assume the appearance of. The fluxweed has to be picked at full moon, and the lacewing flies stewed for 21 days before the potion is made.

Protective Potions (Fake)

Ingredients: Bubotuber Pus and Gravy. Following the return of Voldemort, a vast market appeared for protective potions, most of which were fake and did nothing. Small-time crooks like Mundungus Fletcher sold them to the frightened hordes, who apparently didn't notice that they were often made out of gravy.