What those vertical lines on your nails really reveal | November 4, 2025

Vitamin B12 Deficiency: A Valuable Ally

Essential for the proper functioning of the nervous system and cellular vitality, vitamin B12 directly affects the condition of the nails. A deficiency can cause fatigue, concentration problems, and yes… those dreaded streaks. Vegan diets or certain digestive disorders may be involved.

Consider fortified foods or appropriate supplements, but always consult a healthcare professional.

Slow Thyroid Function: Revealing Nails
The thyroid gland influences nail growth, in addition to regulating our energy and body temperature. If it’s sluggish, the nails become dry, brittle, and ridged. Unexplained weight gain, feeling cold, low energy… all these signs, taken together, can raise suspicions.

A simple hormone test (TSH, T3, T4) can provide clear answers.

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