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Where do they come from?
These lines may point to an iron deficiency 
, which reduces oxygen supply to the nails, or a vitamin B12 deficiency 
, which is essential for the nervous system and healthy cell function.
They may also be related to thyroid issues 
, which slow nail growth and weaken their structure. And let’s not forget the impact of long-term stress 
, which can significantly affect how nails grow.