Here's a list of many of the magical items you can eat (a.k.a. "pills") in the game.  Where moer than one spell is listed it will cast all of them at the same time!  There are more to find so keep exploring!

Thanks to Latharia and Oyg for providing this info.

Learn more about the magical items in the game 

Pill Location* Level* Pill
Level**
Spell
Level**
Spells Flags**
 antacid pill  descent to hell  58/54 56 55   pass door, refresh  
 anti venom  ark 36/49   33 52   cure poison, cure serious, cure serious nodrop
 barracuda's egg      1 45   Water breath  
 blackish herbs      13  blindness  
 blue lizard tongue      3 30   armor, shield  
 bloody heart  citadel of overlords 69/50       mortal restore  
 bluish herbs     12 15   bless  
 Bonbon - coconut  Megamaze 2 108/73       mortal restore  
 Bonbon - lemon  Megamaze 2 107/75       mana regen, refresh, heal  
Bonbon - strawberry  Megamaze 2 108/76       bless  
Bonbon - toffee  Megamaze 2 108/75       detect evil, detect invis, detect hidden  
box of birth control  Dwarven Kingdom 15/20       change sex  
breath of fresh air  port shop 3/199       Water breath  
coconut  oasis 74/90       mortal restore  
crystalized Swamp Gas      40 50   Visiosphere, Tallessphere, curse  
dragonsbane pellet Thrull shop 9/16       giant strength, armor, adrenaline control  
dreamdust powder Thrull shop  3/40       cure blindness, cure critical, heal  
dried chervil New Atlantis 2/10       cure blindness, cure poison, remove curse  
dung, some  keep 41/1       poison, dispel evil, mass invis  
dust of disappearance Milarbor shop 9/21   9  21  armor, cause critical, teleport magic
enchanted prayer beads  white lotus 39/45   39 44  continual light, bless [1] magic 
eye of the lurker cursed wood  39/49   39 49   detect hidden evil 
eyeball  demonia shop 7/50   4 49   cure blindness evil, anti-good 
gizzard      34 36   heal, heal  
gnomish treat gnome village  3/27       fly, barkskin, haste  
god’s blessing port  3/32       armor, chill touch, heal  
grayish herbs     13  giant strength, poison  
green lizard tongue     5 31   curse  
green pill [2]  westreen shop 1/1   1  teleport  
hazelnut Mydgaard forest ???       refresh, cure critical  
heart of the lurker  cursed wood 39/50  39 50   giant strength evil 
herb of malady relief      26 1  remove curse dark 
Ho Shou Wu Akaikiku (nippon) shop 1/8   1  boost  
holy food wafer  port 3/21       bless  
holy wafer  freeport shop 7/49  1 49   bless magic 
intestine keep  96/1       create food, giant strength, stone skin  
Inviso pill     3 49 invis  evil, anti-good
jolt pill [2]  demonia shop 3/50   5 50   refresh, refresh, refresh evil, anti-good 
kiwi Olympus 5/24   5 24   cure poison  
lizard tongue – blue  freeport 1/31       armor, shield  
lizard tongue – green   freeport 6/31       curse  
lizard tongue – red   freeport 12/32       poison  
magic dust  Elemental canyon  1/19 1 20   detect invis  
magic grain  castle land (kerlak) 69/81   67 82   heal, mana regen, heal glow, hum, invis, magic, nodrop
Magic Mushroom (hum)  cursed wood 6/28   10 22   teleport, teleport, teleport hum, evil, magic 
Magic Mushroom (green)  cursed wood 10/8   11 20   cure light, cure light, cure light  
mandrake root  coven 72/74       create spring, detect magic  
mugwort leaf New Atlantis 1/34       refresh, refresh, refresh  
mushroom      6  change sex  
orange      46 44   refresh magic
orangish herbs      7  cure light  
Pai Shu  Akaikiku (nippon) shop 8/51   8 50   cure poison  
pair of ivory dice      7 29   teleport, teleport, teleport  
panacea pill [2]  port shop 7/11   4 12   cure poison, cure blindness, cure serious  
pear  Olympus 30/23   31 26   cure poison  
petrified pomegranate powder [3]  Milarbor shop 5/50   7 50   change sex, dispel magic, stone skin magic
pill of glowing health      7 20   heal, remove curse, Remove paralysis glow, nodrop 
pill of incredible vision      3 29   real vision, infravision magic, nodrop 
pill of salvation      67 31   cure blindness, sanctuary invis 
pinch of black myrrh  Thrull shop 10/38       bless, armor  
pinkish herbs      14  cure poison, poison  
poison oak leaf  Thrull shop 9/100       heal, poison, change sex  
purplish herbs      4 14   change sex  
red lizard tongue      14 30   poison  
reddish herbs      13  detect magic  
rice cake [4]  white lotus 60/44   58  heal magic
salvation [5]  traveller’s inn 67/70       cure blindness, sanctuary  
Shih Hu  Akaikiku (nippon) shop 1/51  51   cure blindness  
small black rock      29 40   armor, protection, detect evil  
sprig of mistletoe Milarbor shop  1/19   8 19   poison, know alignment, blindness magic
stealth port  11/16       invis  
sulphur      71 40   cure critical  
Super eyes pill      6 49   real vision evil, anti-good 
Ta Tsao  Akaikiku (nippon) shop 8/50   8 51   cure critical, cure critical, cure critical  
tasty poison oak leaf Milarbor shop  3/99   4 98   heal, poison, change sex magic
toad style      37 31   armor, stone skin, sanctuary  
toasted fennel seeds  New Atlantis 3/9      detect hidden, detect magic  
watercress leaves  New Atlantis 7/23       giant strength  
wax covered pill [2]  demonia shop 3/41   1 39  boost evil, anti-good
whole sea bass new Atlantis  2/12       cure light, refresh  
wonder pill [2] port  5/21  7 19  change sex, teleport, faerie fog  


* info provided by Latharia       ** info prpvided by Oyg

[1] Larathia doesn’t list bless amongst the effects

[2] Larathia misses “pill” of the end of the name

 [3] Larathia misses “powder” of the end of the name

[4] Oyg had duplicate records for this item, with levels 58, 44 and 44, 46

[5] may be duplicate of 'pill of salivation'