#b3 #niacin megadose (ca 1-2 mg) is indeed a powerful supplement that can provide many health benefits. However, it's important to note that taking too much niacin can lead to serious side effects such as flushing, headache, and gastrointestinal distress. It's recommended to consult with your doctor before starting any new supplement regimen, especially if you have a pre-existing medical condition or are taking other medications.