French phrase
Je suis intolérant à ~.
Meaning
I don't tolerate ___ well.
When to use it
The body reacts badly to a particular substance. This is useful when discussing food, drink, or medication in a cautious tone.
Example dialogue
Vous prenez un café ?
Would you like a coffee?
Je suis intolérant à la caféine.
I don't tolerate caffeine well.