Experts Warn of Liver Damage and Risks from Popular Supplement.

Niacin, a popular supplement, can cause dangerous side effects such as flushed skin, digestive issues, liver damage, and high blood sugar if taken in large doses. While it offers benefits such as lower cholesterol, nutritionist Lisa Richards warns that caution should be exercised when taking niacin supplements. Regular monitoring of liver function and blood glucose levels is important when using high-dose niacin supplements. It's always important to speak to your doctor before adding niacin to your regimen and to follow the guidelines to ensure you're taking safe doses.