Why might urine appear neon after bariatric surgery?Updated 12 hours ago

Noticing bright or neon-colored urine after bariatric surgery can be surprising, but it’s usually completely normal and nothing to worry about.

💊 The most common reason

Neon yellow or bright greenish urine often happens because your body is processing high levels of vitamins, especially B vitamins (like vitamin B2, also known as riboflavin).
Bariatric-specific multivitamins contain higher doses of certain nutrients to meet your post-surgery needs, and your body excretes the excess through urine — causing that vibrant color.

🧬 Other possible factors

• Vitamin A or other fat-soluble vitamins in excess can also contribute to changes in urine color.

• Hydration levels can affect the intensity; the less water you drink, the more concentrated the color may appear.

✅ When it’s normal

If your urine is bright but clear and without odor or discomfort, it’s typically just your body removing extra vitamins — a common and harmless effect of supplementation.

⚠️ When to check with your doctor

If your urine appears dark, cloudy, has a strong odor, or you experience pain, fatigue, or nausea, contact your healthcare provider. These could be signs of dehydration or other underlying issues unrelated to vitamins.

💡 Tip: Staying well-hydrated can help dilute your urine and reduce the intensity of the neon color while still allowing your body to absorb the nutrients it needs.