This bar contains protein from whey and milk, so people who need to avoid dairy proteins, or who have a diagnosed milk protein allergy, should check the ingredient list carefully and likely avoid it. The protein source is a key part of the product, not a minor additive.
It also contains hazelnuts, which are tree nuts. Anyone with a nut allergy should not eat this product unless the label clearly states it is safe for them. The hazelnuts are part of the praline flavour and texture, so they are not just a trace flavouring.
High fibre content is another point to watch. The product is described as having noticeably higher fibre than ordinary candy bars and is meant to feel more substantial. People with digestive sensitivity to high-fibre foods, or with conditions such as irritable bowel syndrome, may find that a whole bar at once is too much. Start with a smaller amount, or choose a time when you do not need to be far from a bathroom.
This is a food product, not intended to diagnose, treat or prevent any disease. If you have a chronic condition, are pregnant or breastfeeding, or take medication, consult a specialist before making significant changes to your diet.