The Unseen Signs: 12 Subtle Red Flags of a Vitamin Deficiency

5. Dry or Cracking Lips and Mouth Corners

Cracked, peeling lips or sore mouth corners—sometimes called angular cheilitis—are easily blamed on winter winds or dehydration. While weather can play a part, persistent dryness or splits at the sides of your mouth can flag a shortage of riboflavin (B2), vitamin B6, or iron. These nutrients help maintain strong, healthy skin cells. Even a mild dip in your intake can show up on your lips and mouth, making everyday talking and smiling a little uncomfortable. Because these symptoms often seem minor, many people grab a lip balm and move on. But when chapped lips refuse to heal, or mouth corners keep splitting, it’s worth exploring whether your meals include enough leafy greens, eggs, dairy, legumes, or lean meats. If symptoms stick around, gently mention this at your next check-up. Sometimes, restoring balance is as simple as mixing up your diet and supporting your cells from the inside out.

6. Hair Thinning or Brittle Nails

Gradual hair thinning or nails that suddenly split, break, or peel? These changes are often chalked up to styling, aging, or genetics. However, biotin (B7), iron, and zinc are three nutrients essential for hair growth and nail strength. When you don’t get enough—from restrictive diets, health changes, or absorption issues—your hair and nails may quietly signal that something’s off balance. Pay attention if your nails become soft or ridged, or your hair sheds more than usual, especially if you haven’t altered your grooming routine. Explore whether your meals include eggs, fish, nuts, seeds, or beans—all excellent for healthy follicles and nail beds. If changes persist or grow more noticeable, it’s worth a gentle conversation with your provider about checking relevant nutrient levels. Self-care sometimes starts at the tips—both of your hair and your fingers.