This is how vitamin B12 deficiency manifests itself in the body

Where can you find it, specifically?

Vitamin B12 is found mainly in foods of animal origin:  beef liver, oysters, herring, eggs, cheeses such as Emmental or Camembert , etc. If you are vegetarian or vegan, it may be more difficult to absorb enough. In this case,  food supplements are a solution recommended by health professionals .

At the slightest warning, it is best to consult a health professional to take stock and stay in good shape all year round.