Items

 

Healing Items

 Potion  Restores 100 HP
 Hi-Potion  Restores 500 HP
 X-Potion  Restores to max Hp
 Ether   Restores 100 MP
 Turbo Ether  Restores to max MP
 Elixir  Restores all HP and MP of one character
 Megalixir  Restores all HP and MP of current party
 Phoenix Down  Revives character from death, restoring 1/10 of max HP
 Tent  Restores to max HP and MP of current party (at save point or on world map)
 Antidote  Cures 'Poison'
 Soft  Cures 'Petrify'
 Maiden's Kiss  Cures 'Toad'
 Cornucopia  Cures 'Mini'
 Echo Screen  Cures 'Sleep'
 Hyper  Causes 'Fury'; Cures 'Sadness'
 Tranquilizer  Causes 'Sadness'; Cures 'Fury'
 Eye Drop  Cures 'Dark'
 Remedy  Cure all status ailments

Offence Items (Used in battle screen)

 Smoke Bomb  Escape from battle if used on allies/enemies
 Speed Drink  Casts 'Haste'
 Hero Drink  Casts 'Mighty Drink'
 Vaccine  Prevents status ailments
 Grenade  Minor special damage
 Shrapnel  Medium fire damage
 Right Arm  Heavy special damage
 Hourglass  Casts 'Stop'
 Kiss of Death  Same effect as 'All Over'
 Spider Web  Casts 'Slow'
 Dream Powder  Casts 'Sleepel'
 Mute Mask  Casts 'Silence'
 War Gong  Casts 'Berserk'
 Loco Weed  Casts 'Confuse'
 Fire Fang  Casts 'Fire 2'
Fire Veil  Casts 'Fire3'
 Antarctic Wind  Casts 'Ice 2'
Ice Crystal  Casts 'Ice 3'
Bolt Plume  Casts 'Bolt 2'
Swift Bolt  Casts 'Bolt 3'
Earth Drum  Casts 'Quake 2'
Earth Mallet  Casts 'Quake 3'
Deadly Waste  Casts 'Bio 2'
M- Tentacles Casts 'Bio 3'
Stardust  Casts 'Comet 2'
Vampire Fang Gain HP stolen from target
Ghost Hand Gain MP stolen from target
Vagyrisk Claw Causes 'Petrify'
Light Curtain Cast 'Barrier'
Lunar Curtain Cast 'M-Barrier'
Mirror Casts 'Reflect'
Holy Torch  Casts 'Dispel'
Bird Wing Inflicts 'Wind' damage
Dragon Scales Casts 'Aqua Breath'
Impaler  Casts 'Toad'
Shrivel  Casts 'Minimum'
Molotov Inflicts 'Fire' damage
S-mine Medium special damage
Sinch Cannon Heavy special damage
Graviball Casts 'Demi'
 T/S Bomb Casts 'Demi 2'
Ink Causes 'Dark'
Dazers Causes 'Paralysis'
Dragon Fang Inflicts 'Lightning' damage
Cauldron  Casts 'Smelly Breath'

Chocobo Items

 Sylkis Greens Speed Plus, Stamina and Appearance Up
Reagan Greens Stamina Up
Mimett Greens No Effect
Cureil Greens Stamina Up
Pahsana Greens Appearance Up
 Krakka Greens Appearance Up
Tantal Greens Stamina and Appearance Up
Gyshal Greens Stamina Up
Zeio Nut Used to breed chocobos
Carob Nut Used to breed chocobos
Porov Nut Used to breed chocobos
Pram Nut Used to breed chocobos
Lasan Nut Used to breed chocobos
Saraha Nut Used to breed chocobos
Luchile Nut  Used to breed chocobos
 Pipio Nut Used to breed chocobos

Sources

 Power Source Increases 'Power' by one point
Guard Source  Increases 'Guard' by one point
 Magic Source Increases 'Magic' by one point
 Mind Source  Increases 'Mind' by one point
 Speed Source  Increases 'Speed' by one point
 Luck Source  Increases 'Luck' by one point

Lv. 4 Limit Breaks

 OmniSlash  Lv. 4 Limit Break (Cloud)
Catastrophe Lv. 4 Limit Break (Barret)
Final Heaven Lv. 4 Limit Break (Tifa)
Great Gospel Lv. 4 Limit Break (Aeris)
Cosmo Memory Lv. 4 Limit Break (RedXIII)
All Creation Lv. 4 Limit Break (Yuffie)
Choas Lv. 4 Limit Break (Vincent)
Highwind Lv. 4 Limit Break (Cid)

Other Items

 Battery Used in Midgar (Disk One)
Tissue No Purpose
1/35 Soldier Part of a set of twelve
Super Sweeper No Purpose
Masamune Blade No Purpose
Save Crystal Make a Save Point anywhere in the Northern Crater
Fight Diary No Purpose
Autograph No Purpose
Gambler No Purpose
Earth Harp Trade for the Master Materias
Desert Rose Trade for the Gold Chocobo
Guide Book Trade for the Underwater Materia