Immune Support GMP - Good Manufacturing Practice Product Support Healthy Lipid Levels Dietary Supplement Berberine is a naturally occurring plant alkaloid found in various plants, including barberry, goldenseal, and Oregon grape. Many herbalists credit this unique alkaloid for the beneficial effects of many traditional tonics made from these plants. Supports healthy cholesterol level. Supports healthy glucose metabolism. Supports cardiac & gastrointestinal function. Supports healthy immune system.