10 Nail Signs That May Reveal Hidden Vitamin & Mineral Deficiencies

Insufficient iron hampers oxygen transport to nails, while low levels of vitamins A, C, and biotin weaken keratin structure, making nails fragile and prone to breakage. These deficiencies, including iron, vitamin A, vitamin C, and biotin (B7), can significantly impact nail health.

Low iron and vitamin B12 levels reduce red blood cell production, leading to anemia and pale, unhealthy-looking nails. This lack of oxygenated blood reaching the nail beds makes them appear white or discolored.

Severe iron deficiency or overload can cause nails to become thin and concave, resembling a spoon shape. This condition, known as koilonychia, is a clear sign that the body is struggling with iron metabolism.

Interrupted nail growth due to malnutrition or illness results in visible ridges across the nail plate. Deficiencies in zinc, magnesium, and protein can all cause these horizontal lines, known as Beau’s lines.

Poor antioxidant protection and immune function, often due to vitamin E deficiency, can lead to thickened, yellowish nails. This discoloration reflects the body's inability to combat oxidative stress effectively.

Lack of essential minerals and healthy fats, such as calcium, magnesium, and omega-3 fatty acids, weakens nail structure, making them dry, crumbly, and prone to breakage.

Often linked to psoriasis, nail pitting can also indicate deficiencies in zinc and vitamin D. These nutrients are essential for healthy keratin production and nail surface integrity.

Poor keratin synthesis and collagen formation, resulting from inadequate protein, biotin, vitamin A, and vitamin C intake, cause slow nail growth and brittle texture.

Reduced oxygenation in the blood from iron or vitamin B12 deficiency can cause nails to appear bluish or purplish, indicating circulatory issues or poor nutrient absorption.

Pigmentation changes, such as dark lines under the nails, can occur when vitamin B12 levels are low. This is often a warning sign of inadequate red blood cell production and poor blood health.