Is it necessary to take a break when using Centrum vitamins?

It depends on why you started taking vitamins and whether this condition persists. Multivitamin preparations are usually used by people with vitamin and mineral deficiencies, malnourished or with problems with providing nutrients with everyday food. In the case of dietary supplements, do not use as a replacement for a varied diet and do not exceed the recommended daily dose. Please note that sometimes taking kits may be contraindicated (e.g. due to the iodine content, patients with a sick thyroid should be careful). If you think that you have a health problem, then longer (e.g. over 3 months) use of vitamin and mineral sets should be discussed with your family doctor. Perhaps you do not have deficiencies or it applies only to selected ingredients, which can be checked through laboratory tests. I think the following article should also explain a lot: https://www.gdziepolek.pl/artykuly/czy-trzeba-suplementowac-witaminy-i-mineraly