Here is a list of item combinations for Monster Hunter. The rest will be added when Mute or I can find them.

Items
No.01 Herb + Blue Mushroom = Potion (95%)
No.02 Potion + Honey = Mega Potion (90%)
No.03 Blue Mushroom + Godbug = Nutrients (90%)
No.04 Nutrients + Honey = Mega Nutrients (75%)
No.05 Antidote Herb + Blue Mushroom = Antidote (95%)
No.06 Cactus Flower + Bitterbug = Herbal Medicine (90%)
No.07 Mega Nutrients + Dragon Toadstool = Max Potion (65%)
No.08 Immunizer + Kelbi Horn = Ancient Potion (55%)
No.09 Honey + Bitterbug = Catalyst (75%)
No.10 Catalyst + Dragon Toadstool = Immunizer (75%)
No.11 Catalyst + Rare Steak = Power Juice (75%)
No.12 Well-Done Steak + Power Extract = Mega Juice (65%)
No.13 Catalyst + Power Seed = Demondrug (65%)
No.14 Demondrug + Pale Extract = Mega Demondrug (unconfirmed)
No.15 Catalyst + Armor Seed = Armorskin (65%)
No.16 Armorskin + Pale Extract = Mega Armorskin (unconfirmed)
No.17 Raw Meat + Toadstool = Poisoned Meat (90%)
No.18 Raw Meat + Stunshroom = Tainted Meat (90%)
No.19 Raw Meat + Sleep Herb = Drugged Meat (90%)
No.20 Sap Plant + Stone = Bomb Material (95%)
No.21 Bomb Material + Ivy = Smoke Bomb (75%)
No.22 Bomb Material + Flashbug = Flash Bomb (75%)
No.23 Bomb Material + Dung = Dung Bomb (75%)
No.24 Sap Plant + Paintberry = Paintball (95%)
No.25 Fire Herb + Nitroshroom = Gunpowder (95%)
No.26 Small Barrel + Fire Herb = Sm Barrel-Bomb (90%)
No.27 Gunpowder + Large Barrel = Lg Barrel-Bomb (75%)
No.28 Gunpowder + Screamer = Sonic Bomb (75%)
No.29 Spiderweb + Ivy = Net (90%)
No.30 Net + Trap Tool = Pitfall Trap (65%)
No.31 Worm + Yambug = Tuna Bait (95%)
No.32 Cricket + Bughopper = Arrowana Bait (95%)
No.33 Firefly + Snakebee Larva = Goldenfish Bait (90%)
No.34 Earth Crystal + Bitterbug = Antiseptic Stone (75%)
No.35 Godbug + Wyvern Fang = Lifecrystals (90%)
No.36 Lifecrystals + Wyvern Claw = Lifepowder (65%)
No.37 Lifepowder + Flute = Health Flute (65%)
No.38 Flute + Antiseptic Stone = Antidote Flute (65%)
No.39 Mega Demondrug + Med Monster Bone = Demon Flute (unconfirmed)
No.40 Mega Armorskin + Med Monster Bone = Armor Flute (unconfirmed)
No.41 Huskberry + Needleberry = Normal S Lv2 (95%)
No.42 Huskberry + Rumblefish = Normal S Lv3 (95%)
No.43 Huskberry + Velociprey Fang = Pierce S Lv1 (90%)
No.44 Huskberry + Pin Tuna = Pierce S Lv2 (75%)
No.45 Sm Bone Husk + Pin Tuna = Pierce S Lv3 (75%)
No.46 Huskberry + Scatternut = Pellet S Lv1 (90%)
No.47 Huskberry + Wyvern Fang = Pellet S Lv2 (unconfirmed)
No.48 Sm Bone Husk + Wyvern Fang = Pellet S Lv3 (unconfirmed)
No.49 Huskberry + Burst Arrowana = Crag S Lv1 (90%)
No.50 Sm Bone Husk + Burst Arrowana = Crag S Lv2 (90%)
No.51 Lg Bone Husk + Bomb Arrowana = Crag S Lv3 (unconfirmed)
No.52 Huskberry + Bombberry = Clust S Lv1 (90%)
No.53 Sm Bone Husk + Wyvern Claw = Clust S Lv2 (unconfirmed)
No.54 Lg Bone Husk + Scatterfish = Clust S Lv3 (unconfirmed)
No.55 Huskberry + Disk Stone = Disk S (75%)
No.56 Herb + Huskberry= Recov S Lv1 (90%)
No.57 Potion + Huskberry = Recov S Lv2 (unconfirmed)
No.58 Toadstool + Huskberry= Poison S Lv1 (90%)
No.59 Sm Bone Husk + Ioprey Fang = Poison S Lv2 (unconfirmed)
No.60 Stunshroom + Huskberry = Stun S Lv1 (90%)
No.61 Sm Bone Husk + Genprey Fang = Stun S Lv2 (unconfirmed)
No.62 Sleep Herb + Huskberry = Sleep S Lv1 (90%)
No.63 Sm Bone Husk + Sleepyfish = Sleep S Lv2 (75%)
No.64 Paintberry + Huskberry = Paint S (90%)
No.65 Antidote Herb + Huskberry = Antidote S (90%)
No.66 Huskberry + Power Seed = Demon S (75%)
No.67 Huskberry + Armor Seed = Armor S (unconfirmed)
No.68 Lg Bone Husk + Dragonseed = Dragon S (unconfirmed)
No.69 Dung + Huskberry = Dung S (75%)


Combination % increase items
Book of Combos 1: +5% to rate of success (1000z)
Book of Combos 2: +10% to rate of success (2000z)
Book of Combos 3: +20% to rate of success (5000z)
Book of Combos 4: +30% to rate of success (10000z)
Book of Combos 5: +45% to rate of success (15000z)

**You have to have all of the previous books equipped at the same time to get the +% benefit (ie Book 1 and Book 2 in your on-hand inventory will give you the +10% while just having Book 2 would do nothing).**

Wondering when or where to purchase the items you need?
<----- Click here for a listing of all the online Special Deliveries in the Marketplace ----->

If you are looking for the Weapon Upgrades posts, click here.

*Edit* Thanks Mute...gives me more time to do some homework this morning

I didn't care for the twin daggers that much. I couldn't make hurricane, so maybe my opinion will change but they seem waaaay underpowered (I know they need to be upgraded), but the assassin SS was so nice.

Huskberry and blue mushroom = potion? I thought only herb + blue mushroom did that.

Anyway ... Potion + honey = megapotion

=P

10/4 - Appended list/formatting to Zio's post above.

Cool. Maybe we should Pin 2 separate topics:
One for weapons and One for item combinations.

I'll second that. Great idea.

No.19 Raw Meat + Sleep Herb = Drugged Meat (90%)
No.22 Flashbug + Bomb Material = Flash Bomb (75%)
No.24 Sap Plant + Paintberry = Paintball (95%)
No.56 Herb + Huskberry= Recov S Lv1 (90%)
No.58 Toadstool + Huskberry= Poison S Lv1 (90%)
No.60 Stunshroom + Huskberry= Stun S Lv1 (90%)
No.64 Paintberry + Huskberry= Paint S (90%)

Made a big update to my list of combinations. I cheated by using pensil's site yet again. >_>

EDIT: I bought all 5 Books of Combos and from what I've tested here is how they work:
Book of Combos 1: +5% to rate of success
Book of Combos 2: +10% to rate of success
Book of Combos 3: +20% to rate of success
Book of Combos 4: +30% to rate of success
Book of Combos 5: +45% to rate of success

You have to have all of the previous books equipped at the same time to get the +% benefit (ie Book 1 and Book 2 in your on-hand inventory will give you the +10% and just having Book 2 would do nothing). I got the information for Book 5 from pensil.

10/4 - Added this information to the top post.

No.42 Huskberry + Rumblefish = Normal S Lv3 (95%)
No.44 Huskberry + Pin Tuna = Pierce S Lv2 (75%)
No.45 Sm Bone Husk + Pin Tuna = Pierce S Lv3 (75%)
No.49 Huskberry + Burst Arrowana = Crag S Lv1 (90%)
No.50 Sm Bone Husk + Burst Arrowana = Crag S Lv2 (90%)
No.55 Huskberry + Disk Stone = Disk S (75%)
No.63 Sm Bone Husk + Sleepyfish = Sleep S Lv2 (75%)
No.65 Antidote Herb + Huskberry = Antidote S (90%)
No.66 Huskberry + Power Seed= Demon S (75%)

Added these in up top.
-Mute

Needed Demon Drug to make my Cutlass today, so this list was a big help. Now I just need to know how to make Mega Demon Drug for the Cutlass+

^_~

Damn, I guess that's a rare harvest item huh? Too bad, I like these cutlass, but as is they are unusable due to poor sharpness. Fought Kut ku and sharpened them 5 times. lol

*coughs*

No.33 Firefly + Snakebee Larva = Goldenfish Bait (90%)

No.s 43 and 52 added.

Added in the remaining combinations based on information gathered from various sources. I listed the %'s in a red font as unconfirmed, so that when anyone figures out the true success %'s to the items, post em here and we can work towards finalizing the list.