Mercers Ingredient Effect Overhaul
🟡 Updated this year⚠️ Install Order · 3 steps
Install in this order, then this mod last — most mods fail to load without their framework and dependencies in place.
Preview

🔍 Analysis
- 👍 0.6% endorsement rate
- 🏆 #5 of 10 Magic - Alchemy mods in this game by downloads
📋 About This Mod
Mercer's Ingredient Effect Overhaul:
54BlXx-B-p4
Shivering Isles
COBL : https://www.nexusmods.com/oblivion/mods/21104 (You only really need the textures, meshes and the cobl main.esm )
Alternate site for COBL : http://www.theassimilationlab.com/forums/files/file/951-cobl/
Description:
This mod re-balances the ingredient effects of all ingredients from Oblivion, Shivering Isles and COBL.
The main purpose of this mod is to re-balance the ingredient effects so that the game-play for us alchemists is improved.
It does this by having there be a direct relationship between the rarity of an ingredient and the strength/usefulness of the effects inherent to that ingredient, massively improving the ability to make more complex potions and poisons and and by reducing a few exploits.
The story behind the mod:
The mod began many years ago after I had stumbled upon the mod Pestilent Afflictions. Pestilent Afflictions (which I highly recommend) makes diseases worse in a very interesting way and I saw the need for improving the diseases feature of Oblivion. However, I quickly realised that the mod was practically irrelevant since all I had to do to avoid even the worst of diseases was to take a bite out of the fairly common mandrake root since it has Cure Disease as its 1st effect.
To amend this folly I removed the Cure Disease effect from mandrake root and from a few other ingredients. It helped a lot and I was happy for a while getting riddled with diseases which now required a bit of more to cure.
After a while I returned to the CS to edit a few more things that I felt was an exploit or for other reasons needed changing.
For instance, I always felt it was too easy to create poisons by using Sacred Lotus Seeds which is abundant in several places.
It was also too easy to create Restore Health potions since Fly Amanita Cap has this effect and the Imperial City is full of them.
Precisely because it was too easy to very quickly create a lot of potions and poisons, it began feeling like a chore to do it and I decided to change this by making alchemy much more intriguing:
I began reducing the strength of the ingredients that I felt was too abundant and also began testing effects that were normally only used in spells, yet never seen in ingredients.
After much testing of all the magical effects and many revisions I have ended up with this mod. I never thought to release this mod to the public when I first began with my small fixes many years ago, as from the very beginning it was built completely on my own preferences. But over the years it has grown from just a few fixes into a comprehensive over
Mercers Ingredient Effect Overhaul rebalances ingredient effects across Oblivion, Shivering Isles, and COBL, with optional patches for major overhaul mods. It's a niche utility for modded Oblivion players seeking consistency, backed by 182 endorsements and frequent updates.
✨ Key Features
📊 Pros & Cons
✅ Pros
- Active development—last updated June 2026, so it's fresh.
- Solid community trust with 182 endorsements and over 31k downloads.
- Built-in compatibility patches for major overhaul mods save you the headache.
⚠️ Cons
- Requires the original game plus COBL, which is an extra dependency for some.
- Niche appeal: if you don't run overhaul mods, the patches are useless.
For Oblivion modders running overhaul setups like OOO or Maskar's who want ingredient effects to make sense. Skip if you play vanilla or don't care about alchemy consistency.
💡 Beginner Tips
- Use a mod manager like Wrye Bash to handle the optional patches—manual install gets messy.
- Load the patches after the main mod and after the overhaul mods they patch.
- Check the mod page for any load order notes—Oblivion is picky about that.
📊 Mod Details
- Game
- Oblivion Mods
- Author
- Mercer Meka
- Version
- 2.4
- Downloads
- 31,826
- Endorsements
- 182
- Category
- Magic - Alchemy
- Created
- 10/11/2009
- Updated
- 6/14/2026
🔧 How to Install Oblivion Mods
Download from Nexus.
📖 Full step-by-step install guide for Oblivion →
Visit the official mod page for specific installation instructions for this mod.
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