Several times during the series, mostly before or during fights, Geralt drinks some sort of black (?) potion he takes out of his bag.

The only noticeable effect it seems to have is turning his eyes black (not all the time though), but I guess it also have some more useful effects.

What exactly is this potion, and what are all the effects, good or bad, it has on him ?

  • I know the Netflix series is based on the books, rather than the games. However, in the games, witchers concoct various potions to aid them in battle against different types of monsters. Taking potions increases the witchers’ toxicity, but provides benefits such as allowing them to see in the dark (cat), boosts to stamina (tawny owl) and adrenaline (maribor forest) and making their blood dangerous to certain monsters (black blood). Regardless of the potion, the witcher often appears with black eyes and dark veins after taking one, due to toxicity.
    – m-smith
    Dec 31, 2019 at 10:14

1 Answer 1


The effects are not explicitly stated in the Netflix series, but to lift a few quotes from the books:

In The Witcher, he consumes two potions:

  1. The mixture which helped the witcher gain full control of his body was chiefly made up of veratrum, stramonium, hawthorn and spurge.

    The other ingredients had no name in any human language. For anyone who was not, like Geralt, inured to it from childhood, it would have been lethal poison.

    In the silence his hearing, sharpened beyond measure, easily picked out a rustle of footsteps through the courtyard overgrown with stinging nettles.

  2. After drinking a mixture of banewart, monk's hood and eyebright the face takes on the colour of chalk, and the pupils fill the entire iris. But the mixture enables one to see in the deepest darkness...

    He did not want the magnate to realise how fast his movements and reactions now were.

These effects are described again in the second short story:

You're sick, Geralt. You react to elixirs badly. You've got a rapid pulse rate, the dilation of your eyes is slow, your reactions are delayed. You can't get the simplest Signs right.

  • The Voice of Reason, The Last Wish

In the second book, we are told:

After the elixirs you wouldn't even have felt an open fracture, until the protruding bones started snagging on hedges.

  • The Sword of Destiny, Chapter 3

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