At beginning of the game i noticed the unknown and different effects of the items.
How much do they heal? Which one will heals what? And which one will heal me best in emergency situations without poisoning me?
I started taking notes for myself of every item I found ingame and decided to share them hoping it'll help some of you.

If you found an item that's not on the list, or want to say something about an existing one:
Please share so I can add it to the list :)

Strawberry Potato = +15MP, -1HP
Dried fish = +20MP
Home made potatos = +30MP
Godly potato = +30MP
Potato stick = +30MP
Pawn cracker = +30MP
Tasty crisps = +60MP
Fried Snack = +60MP
Hot potato = +60MP, + Poison
Garlic potato = +60MP, +Smelly
Greasy potato = +60MP, +Curse
Curry cracker = +75MP
Almond fish = +150MP
Premium potato = +999MP

Milk = +1HP
Unpast milk = +1HP
Vitamin milk = +1HP, +15MP
Low fat milk = +1HP, -15MP?
Sour milk = +1HP, +Poison
Moldy milk = +1HP, +Poison
Hot milk = +1HP, +Sleep
Countryside milk = +2HP, +Blind
Organic milk = +2HP

These items seem to change the MP they give - Not sure if it's random or depending on level.
Usually it's 5-20MP

Soft candy = +10MP, -Cursed
Xylitole chewing gum = +10MP, -Smelly
Balloon chewing gum = +10MP, -Silence
Hyper mint chewing gum = +10MP, -Smelly
Whistle candy = +10MP, -Silence
Sleepy candy = +10MP, +Sleep
Melting candy = +10MP, +Speed
Energy candy = +10MP, -Bind/immobilized
Depoison candy = +5MP, -Poison
Wise truffle = Level up.
Cool Candy = +10MP, -Burn
BLANK item (Truffle) = +10MP, -1HP
Sugar gum = +10MP
Black chewing gum = -Curse, - Blind, -Smelly
Lemonade = +10MP
Forgetty gum = +MP, but you forget all identified items.
Wine gum = +10MP
Cheap choco = +30-60MP
Milk chocolate = +75MP, -Negative Status
Exploding chewing gum = -20MP
Salmiak gum = -25MP
Cacao 100 = -35MP

Strange perfume = Random Effect (example: Pan falls on your head -10MP)
Roadway = Maps the area around you
Professor perfume = Identify the effect of an item.
Angry perfume = Enpowers you for a while.
Effective perfume = Lowers the MP costs.
G'night perfume = +Sleep
Witch's perfume = Teleports you back to Witch's Village.
Spell perfume = Levels up a spell.
Farewell perfume = Teleports you to a random location.
Darkness perfume = +Blind
Aroma perfume = Heals negative status.
Adult perfume = Level up.
Perfume of doom = Summons a dark werewolf which one hit kills you.
Happy perfume = A random, lucky effect.
Unhappy perfume = A random, bad effect.
Speedy perfume = +Speed, +Poison
Tired perfume = -70MP, -2HP
Aura perfume = +Protect
Guiding perfume = Attracts monsters.

Gaia crosse = Increases earth power.
Healing crosse = Doubles the effect of healing spells.
Crosse of envy = Increases the chance of an enemy getting a status change.
Crosse of discipline = Increases XP gained.
Storm crosse = Increases storm power.
Mudstream crosse = Increases frost power.
Crosse of greed = Doubles the amount of White Magicite you gain.
Wind crosse = Decreases costs for storm spells.
Blaze crosse = Decreases costs for heat spells.
Crosse of pride = Spells that target you cost half MP but ranged spells cost double.
Crosse of sloth = Cost for summonig or setting magic is decreased.
Benevolence crosse = Healing spell effects are tripled, but milk stops working.
Crosse of no mercy = All healing spells turn into neutral attack spells.
Crosse of gluttony = Increases your max. MP by 20%
Fire blood crosse = Increases heating power.
Beginner crosse = ?, 'Everyone starts with one of these.'
Iron crosse = ?, 'You can hit with it but it is not for real matches'
Mother crosse = Decreases costs for earth spells.
Anger crosse = High melee power?, 'A battle crosse to smite the enemy with female anger. Using this in a match will get you a red card.'

Warning badge = Cost and power of the 4th spellslot is halved.
Victor Badge = If your MP fall from 40+ to 0 you keep 1MP.
Soul Badge = Increases max HP by 1.
Badge of calmness = MP restores itself twice as fast and doesn't decrease at 0 HP.
Badge of holding = Increases max number of items you can carry.
Magical circle badge = Casting time for slot 2 decreased.
Badge of knowledge = All items can be identified.
Throw Badge = Instead if dropping items, it throws them in front of you.
Amplify badge = Spells level up by casting it.
Badge of Memory = You keep badges and crosses when you die.
Kaleidoscope badge = +Speed when hit with a negative status

White magicite = Your currency/money.
Anonymous magicite = Spell will depend on the name you give it.
Crimson magicite = Heat spell.
Azure magicite = Frost spell.
Topaz magicite = Earth spell.
Emerald magicite = Storm spell.
Light magicite = Not sure, only got one with '#Angora soul' for Ms. Wanderer.
Back to basic magicite = Base spells speciality is deleted.
Power magicite = Increases spells power by 1.
Level magicite = Increases spells level by 1.
Stacking magicite = Elemental alignments stack together.
Individualistic magicite = Spell's area of effect is limited to the caster.
Economy magicite = Spell's MP cost goes slightly down.
Rename magicite = New spell's name will be the addon's name.

Ms Wanderer
-G'night perfume (Buy or find it)
-Bone (Have some Dried fish in the inventory and talk to Ms Reactor)
-Speed spell (Simply name a magicite 'Speed' and give it to her)
-#Angora soul spell (Freeze an angora [ballon like monster] and kill it)
-Perfume of doom (Buy or find it) (Got the quest after finishing the game, don't know if you will get it sooner)

Ms Reactor
-Bomb spell (Simply name a magicite 'Bomb' and give it to her, might work with others but didn't with the others i tried)
-High power heat spell, which will unlock her dungeon. I handed her a 50 Power heat spell (Mine spells are pretty decent for this) - Thanks Blackhole for this.