Evidence‑Based Nutritional Evaluation and Replacement in Angular Cheilitis

Screening for Micronutrient Deficiencies

Zinc deficiency is common in patients with malabsorption and should be screened for when angular cheilitis is present. 1
A complete blood count is required to detect anemia and macrocytosis as part of the work‑up. 1
Serum ferritin values up to 100 µg/L may still reflect iron deficiency in the setting of inflammation; interpretation must consider inflammatory status. 2
Serum folate should be measured concurrently with vitamin B12 because the two deficiencies frequently coexist. 2

C‑reactive protein must be below specific thresholds (e.g., <20 mg/L for zinc, <10 mg/L for selenium and vitamin A, <5 mg/L for vitamin B6 and vitamin C) to ensure reliable micronutrient measurements; elevated CRP can falsely lower acute‑phase reactants. 2
Serum zinc behaves as a negative acute‑phase reactant and may appear falsely low during inflammatory states; CRP‑adjusted interpretation is essential. 1

Oral iron supplementation (≤100 mg elemental iron daily) is recommended as first‑line therapy for iron deficiency in patients without active inflammation. 1
Intravenous iron is advised for patients with clinically active disease or intolerance to oral iron. 1
Zinc supplementation should be initiated when a deficiency is confirmed; dosing is individualized according to severity and underlying cause. 1

Patients with inflammatory bowel disease—particularly Crohn’s disease involving the small intestine—are at increased risk for vitamin B12 and folate deficiencies and should undergo regular micronutrient screening even during remission. 1

Riboflavin deficiency specifically manifests with angular stomatitis, cheilosis, and lip inflammation, often occurring alongside other B vitamin deficiencies 3

Inflammatory bowel disease, particularly Crohn's disease with small bowel involvement, predisposes to vitamin B12 and folate deficiencies 3, 4
Malabsorption conditions including short bowel syndrome and celiac disease increase risk for multiple vitamin deficiencies including riboflavin 3
The most common nutritional deficiencies in IBD patients include vitamin B12, folate, iron, calcium, magnesium, selenium, and zinc 5, 6

For riboflavin assessment, use the erythrocyte glutathione reductase activity test to evaluate tissue saturation and long-term status 3
Never treat folate deficiency without first checking B12 status, as folate supplementation can improve blood parameters while worsening neurological manifestations of B12 deficiency 7

The daily recommended dose of riboflavin is 1.3 mg for males and 1.1 mg for females, though higher doses may be required for chronic malabsorption 3

Oral iron supplementation should not exceed 100 mg elemental iron daily in inactive disease and should be avoided during active inflammation due to impaired absorption 4
Many micronutrients are acute phase reactants, making interpretation unreliable during active inflammation 4