I’ve just been put on 400 mg of B2, daily, for headaches and was trying to get more information.
New treatment for migraines includes 400 milligrams of riboflavin per day. Ask your doctor before beginning as this is a very large dose of riboflavin. You also want to make sure your doctor eliminates other possible causes for your headaches.
According to the most recent RDA (Recommended Dietary Allowance), no cases of riboflavin toxicity have been reported. The stomach/intestines capacity to absorb riboflavin is rather limited.