How long should you take vitamin B2 for chapped lips?

It is generally recommended that individuals with chapped lips take 5–10 mg of vitamin B2 orally per day for 1–2 weeks, after which noticeable improvement can typically be observed. However, the specific dosage and duration should be determined based on individual circumstances and medical advice.

Chapped lips may have various causes, one of the most common being a deficiency in vitamin B2. Vitamin B2 (riboflavin) is a water-soluble vitamin that plays an important role in maintaining the health of the skin, mucous membranes, and eyes. It participates in numerous metabolic processes in the body, including the metabolism of proteins, fats, and carbohydrates. Additionally, vitamin B2 supports cell growth and tissue repair. A deficiency in this vitamin can disrupt these metabolic functions and impair cellular regeneration, leading to symptoms such as chapped lips. Therefore, it is commonly advised to take 5–10 mg of vitamin B2 daily for 1–2 weeks to achieve visible results.

It should be noted that excessive intake of vitamin B2 may cause adverse effects such as headache, nausea, and vomiting. Therefore, supplementation should follow medical guidance; self-adjusting the dose or extending the treatment period is not recommended. Moreover, maintaining a balanced diet rich in vitamin B2—such as milk, eggs, meat, fish, and legumes—can help prevent deficiency.