Ectoplasm (Skyrim)

Where to find
2-4 Can be found inside of the Shrine of Mehrunes Dagon.
 * A sample of ectoplasm can be found in Anise's Cabin.
 * Another can be found in the Abandoned Prison.
 * Four (One on the first floor, three on the second) can be found at the College of Winterhold in The Hall of Countenance.
 * There's another one on a table in Jorgen and Lami's House.
 * Found in the Alchemy room in some houses that you can own.
 * Found on Dragon Cultists in Forelhost.
 * Can be found occasionally by searching the 'ghostly remains' of slain Ghosts (but not Corrupted Shades).
 * Can be bought at Arcadia's Cauldron.

Restore Magicka

 * Briar Heart *
 * Creep Cluster
 * Dwarven Oil
 * Elves Ear
 * Fire Salts
 * Frost Salts
 * Giant Lichen
 * Grass Pod
 * Human Flesh *
 * Moon Sugar
 * Mora Tapinella
 * Pearl
 * Red Mountain Flower *
 * Taproot
 * Vampire Dust
 * White Cap

Fortify Destruction

 * Ash Creep Cluster
 * Beehive Husk
 * Glow Dust
 * Glowing Mushroom
 * Nightshade *
 * Wisp Wrappings

Fortify Magicka

 * Briar Heart *
 * Histcarp
 * Jazbay Grapes
 * Red Mountain Flower *
 * Salmon Roe
 * Tundra Cotton
 * Void Salts *

Damage Health

 * Crimson Nirnroot
 * Deathbell
 * Emperor Parasol Moss
 * Falmer Ear
 * Human Flesh *
 * Human Heart
 * Imp Stool
 * Jarrin Root
 * Nightshade *
 * Nirnroot
 * Poison Bloom
 * Red Mountain Flower *
 * River Betty
 * Skeever Tail
 * Small Antlers
 * Troll Fat
 * Void Salts *

* multiple effects