I class it the same as anchovies, slightest hint and I am gagging.
Written on the side of the box :-
Before you use Marmite toothpaste: Do not use Marmite toothpaste if you are allergic to Marmite
or Toothpaste. May contain traces of nuts.
Possible side effects: Gagging, nausea, not understanding why people like Marmite.
If you experience any of these problems stop using Marmite toothpaste
immediately. You do not need to consult your dentist or doctor.
Do not use after expiry date, unless you're feeling brave and
have a stomach of steel.
Keep out of reach of Marmite addicts as they may overindulge.
Do not store above 25c because it'll go a bit weird.
Did make me smile when I read this. Very clever marketing, shame most people would never read it though