Witcher 3 Alchemy Guide: Oils, Potions, Decoctions, Toxicity

There is a version of The Witcher 3 where you kill a leshen by rolling behind it and mashing fast attack for four minutes. There is another where the same leshen dies in forty seconds because you spent ninety seconds beforehand coating a silver sword in relict oil, drinking Thunderbolt, and popping an Ekimmara decoction so every hit refunds health. Same fight, same level, wildly different game.

Alchemy is the system CD Projekt built the combat around and then, bizarrely, never forced anyone to engage with. It also holds the deepest set of numbers in the game, most of them buried two menus deep behind vague tooltips. So here they are in the open: what each category does, what it costs in toxicity, and where your points should go.

Toxicity is a resource not a punishment

Every potion and decoction you drink adds to a Toxicity meter under your health bar that drains back down over time. Cross your overdose threshold and Geralt takes poison damage, his health bar turns sickly green, and his face starts looking like a Nilfgaardian interrogation went badly.

Here is the part people miss: in the Remastered Alchemy tree, several abilities only pay out while you are carrying toxicity, according to the Witcher wiki's Remastered skill tables. Frenzy slows time by 5%, 10% or 15% when an enemy is about to counterattack, but only while toxicity is above 1. Endure Pain adds 10%, 20% or 30% maximum Vitality while toxicity is over the safety threshold. Delayed Recovery only works above 70%, 65% or 55% toxicity depending on its rank, and Volatile Compound adds 0.1% to 0.3% bomb damage per point of toxicity. Toxicity is not a tax on drinking. It is the state your build wants to live in.

Two abilities decide how hot you can run. High Tolerance, which took Heightened Tolerance's slot in the Remastered update, no longer raises an overdose threshold. At 80% toxicity or higher you take 150% damage from enemies, and in exchange your critical hit damage rises by 33%, 67% or 100% of your current toxicity across its three ranks. It is a dare, not a safety net. Acquired Tolerance raises your maximum toxicity by 1, 2 or 3 for every alchemy recipe you have learned. That second one is why hoovering up every recipe scroll from every alchemist merchant matters even when the recipe looks useless: at rank 3, ten learned recipes is thirty extra points of headroom.

The important distinction, and it trips up a lot of theorycrafting: decoctions apply what the game treats as a toxicity offset rather than normal toxicity, and it does not drain on its own. Decoction toxicity is rent you pay for the whole 30 minutes.

Oils are the best damage in the game

If you only adopt one habit from this guide, adopt this one. Oils are free, permanent, and multiplicative.

Craft an oil once and it is yours forever. Oils are never consumed and never need replenishing. A +50% attack bonus for zero ongoing resource cost has no equivalent anywhere else in the game.

The Alchemy tree turns oils from a damage buff into a defensive package too. Protective Coating adds 5%, 10% or 15% protection against attacks from the monster type the applied oil targets. Poisoned Blades gives oiled blades a 5%, 10% or 15% chance to poison the target, and in the Remastered tree it opens a whole poison branch: Toxic Shock, Debilitating Poison and Potent Sting. Hunter Instinct adds 20%, 40% or 60% critical hit damage against the oiled enemy type while your Adrenaline is maxed.

What the tree no longer has is Fixative, the old skill that stretched oil charges and, after the 4.0 update, let a blade carry more than one oil. It was cut in the Remastered skill overhaul, and none of the 20 Remastered Alchemy skills on the wiki's list extends oil charges or adds a second oil.

Pair this with the armour discussion in our Witcher 3 witcher gear guide, which covers the sets you will be wearing into those monster fights.

The potions worth a consumable slot

You have limited quick-slots and limited toxicity. Most of the 20-odd potions in the game are situational. These are the ones that earn permanent residence, listed at Superior tier since that is where you will end up:

• Superior Swallow — 80 Vitality regeneration over 20 seconds, and damage does not interrupt the regen. Five charges, 20 toxicity. In New Game Plus that jumps to 150 regeneration. This is your panic button on Blood and Broken Bones and Death March, where meditation no longer heals you.
• Superior Thunderbolt — +35% attack power for 90 seconds at 25 toxicity, and it grants a flat 100% critical hit chance during storms. Yes, that means waiting for weather is a legitimate strategy.
• Superior Petri's Philter — +25% Sign intensity for 90 seconds, and Signs always apply their special effects. If you are running anything sign-flavoured this is non-negotiable.
• Superior Blizzard — every kill slows time by 40% for 12 seconds, and with three Adrenaline points banked your actions stop draining Stamina during the slow. 20 toxicity, four charges.
• Superior Golden Oriole — 180 seconds during which poisons heal you instead of hurting you. Take it into anything with a venom attack and a whole enemy mechanic inverts.
• Superior White Raffard's Decoction — a full instant heal plus a brief window of damage immunity. Three charges, 25 toxicity. It is a get-out-of-death card, not a sustain tool.
• Superior Tawny Owl — +10% Stamina regeneration in combat and it never expires at night. The sign-caster's fuel tank.

Note the toxicity numbers. At 20 to 25 apiece, three potions cost 60 to 75 toxicity, and with Acquired Tolerance slotted your pool grows every time you learn a new formula. If you run High Tolerance, watch the 80% line: past it you take 150% damage.

Decoctions turn a build into a machine

Decoctions are the endgame. They are brewed like potions but require a relic-class mutagen harvested from a rare monster, they last a full 30 minutes, they only store one charge, and since patch 4.0 each one costs 50 toxicity instead of the old 70. That is a huge quality-of-life change: two decoctions used to eat almost your entire pool, and now they are genuinely stackable.

The ones that reshape how you play:

• Ekimmara decoction — 10% life leech on damage dealt. Crucially the damage does not have to come from your sword, so bleeding and burning ticks feed you too. Set a pack of bandits on fire with Igni and you heal from all of them at once.
• Ekhidna decoction — any action that consumes Stamina heals 10% of your Vitality. Dodging, rolling and casting all become heals. It does not work with Whirl, so do not build around that combo.
• Water hag decoction — +50% damage while at maximum health. Unusually it boosts damage, not attack power, which means it also scales bombs and sign damage. Pair it with a heal-heavy setup and the "at full health" condition is easier to maintain than it sounds.
• Archgriffin decoction — strong attacks consume all your Stamina and shave 5% off the target's Vitality after normal damage. Useless against trash, devastating against enormous health pools. This is a boss-fight tool.
• Katakan decoction — a flat +10% critical hit chance, doubled from 5% by the next-gen update. Boring, universally correct.
• Troll decoction — Vitality regeneration in and out of combat, with the next-gen version granting 20 regeneration per enemy killed during a fight.
• Basilisk decoction — the odd one out. It costs only 40 toxicity, lasts 96 minutes rather than 30, and buffs a randomly chosen Sign's intensity at dusk and dawn.
• Nekker warrior decoction — mounts never panic and mounted combat damage goes up 50%. Niche, but it is the only way to make fighting from Roach anything other than a comedy sketch.

Ekimmara plus Water hag is the classic pairing: you leech back to full, and at full health you hit 50% harder. Ekhidna plus Archgriffin is the other famous one, since Archgriffin dumps your Stamina and Ekhidna pays you Vitality for spending it. If you want the mutation-level version of this conversation, the Witcher 3 build guide covers how these slot into full endgame archetypes.

Bombs are not a beginner trap

Bombs get written off because their base damage is unimpressive. Then you put three points into Pyrotechnics, which adds a flat +150 damage to every bomb — including bombs that normally deal no damage at all — and suddenly a utility item is a nuke. Efficiency adds one, two or three extra bombs per slot, and Cluster Bombs splits each bomb into two, three or four fragments, each dealing 40% of the original bomb's damage.

The utility bombs are the real argument, though:

• Dimeritium Bomb releases dimeritium slivers that block magic and monsters' magical abilities for 15 seconds. Against mages and teleporting enemies this is the entire fight.
• Moon Dust scatters silver splinters that stop monsters transforming or regenerating for 20 seconds. Werewolves and vampires become normal enemies.
• Northern Wind freezes enemies for 8 seconds, and frozen enemies take extra damage from your follow-ups.
• Devil's Puffball sprays a poison cloud, which combos beautifully with Golden Oriole active since the poison cannot hurt you back.
• Samum stuns everything in range and buys you a free opener.

There is also a hard mechanical reason to carry bombs: only three of them destroy monster nests. Dancing Star, Grapeshot and Samum. If you want a region to stop respawning nekkers, you need one of those in your bag.

Meditation alcohol and never running dry

Potions and bombs are not consumables in the way most RPGs mean it. Meditate for at least an hour with any strong alcohol in your inventory and every potion and bomb refills to full. The game picks the cheapest qualifying alcohol you are carrying, with Alcohest as the default, so buying Alcohest in bulk from any herbalist is effectively buying infinite potions. Alcohest is also a required ingredient for every enhanced potion, which makes it the single most valuable stack in your inventory.

Oils, as covered, never need replenishing at all.

The practical loop: fast travel to a herbalist, buy every Alcohest and every unknown formula they carry, meditate, move on. Two minutes of shopping funds an entire region.

The Alchemy tree ranked

The Remastered update rebuilt how this tree unlocks. CD PROJEKT RED's patch notes say skills now sit in a tree, every skill has three ranks, and a new skill unlocks when you have its prerequisite skill "rather than spending a set number of skill points". Old saves have their points reset. Alchemy's entry skills, the ones with no prerequisite, are Refreshment, Efficiency and Frenzy. Where the wiki lists several prerequisites below, any one of them is enough.

The cuts matter for anyone following an older build: Fixative, Killing Spree and Steady Aim are gone, and Heightened Tolerance is now the very different High Tolerance. Our Witcher 3 Remastered skill tree guide has every Alchemy skill with its rank 1 and rank 3 effect.

Take first:

• Refreshment (entry skill) — every potion dose heals 10%, 20% or 30% of maximum Vitality as it goes down. On difficulties where meditation does not heal, this converts your buffs into sustain.
• Pyrotechnics (unlocks from Adaptability, Refreshment or Efficiency) — the bomb payoff skill, +50, +100 or +150 damage on every bomb.
• Protective Coating (unlocks from Pyrotechnics) — free damage reduction on a habit you already have.

Take second:

• Hunter Instinct (unlocks from Refreshment, Efficiency or Frenzy) — 20% to 60% crit damage against the oiled monster type, gated behind maxed Adrenaline.
• Acquired Tolerance (unlocks from Hunter Instinct) — more toxicity headroom the more recipes you have learned.
• Tissue Transmutation (unlocks from Protective Coating, Acquired Tolerance or Toxic Shock) — decoctions add 300, 600 or 900 maximum Vitality while they are active.
• Delayed Recovery (unlocks from Tissue Transmutation) — above 70%, 65% or 55% toxicity depending on its rank, each potion you drink adds 5 seconds to your active potions, up to their maximum duration.

Take if the build wants it:

• High Tolerance (unlocks from Tissue Transmutation) — crit damage scaling with toxicity, paid for with 150% damage taken at 80% toxicity or more. Only for builds that live hot on purpose.
• Side Effects (unlocks from Fast Metabolism) — each potion has a 33%, 67% or 100% chance to trigger another random potion's effect with no extra toxicity, one bonus effect at a time. Chaotic, but free value.

Skip unless you are specialising: Efficiency and Cluster Bombs are excellent for a dedicated bomb build and dead weight otherwise.

Remember that unlocking an ability does nothing until you slot it, and that filling a slot group with three abilities of one colour beside a matching mutagen adds a bonus from that mutagen. That mechanic is explained in the Witcher 3 beginner guide, and green Alchemy abilities obey it exactly like red and blue.

Farming ingredients without losing a weekend

Most alchemy ingredients are herbs you walk past constantly. Celandine, Verbena, Ribleaf, Berbercane fruit and Blowball are everywhere in Velen and Skellige, and every herbalist restocks them. Do not go on dedicated herb runs; harvest whatever highlights while you are riding somewhere.

The real bottleneck is relic mutagens for decoctions, which only drop from rare and named monsters once Mutation is unlocked. No farming route fixes that. Contracts do, because contract targets are precisely the high-tier monsters that carry them.

The other bottleneck is money for formulas. Sell trophies, armour you will never wear, and your pile of junk swords. Never sell monster parts or alcohol. And since you are already sitting in an inn buying Alcohest, the innkeeper almost certainly plays cards — our Witcher 3 Gwent guide explains how to take their crowns.

Quick Action Checklist

• Apply the correct oil before every fight. Basic +10%, enhanced +25%, superior +50%, lasting 20, 40 and 60 hits respectively.
• Don't plan around Fixative. The Remastered tree cut it, and no Alchemy skill now extends oil charges.
• Keep Superior Swallow, Thunderbolt and Petri's Philter in your quick-slots at 20 to 25 toxicity each.
• Run two decoctions once you have the mutagens. Ekimmara plus Water hag is the safest general-purpose pairing at 50 toxicity each.
• Buy every unknown formula you see. Each one is +1, +2 or +3 maximum toxicity with Acquired Tolerance, depending on its rank.
• Carry Alcohest in bulk. Meditating an hour with alcohol refills every potion and bomb.
• Keep Dancing Star, Grapeshot or Samum on you for monster nests. No other bomb destroys them.
• Take Pyrotechnics before you write bombs off, since it adds +150 flat damage to every one of them.
• Carry toxicity on purpose. Frenzy needs it above 1 and Delayed Recovery above 70%, 65% or 55% depending on its rank, but with High Tolerance slotted you take 150% damage at 80% or more.