Dihydroberberine (DHB) is the reduced form of berberine with 5x better oral bioavailability and dramatically better GI tolerance. Standard berberine causes GI distress (cramping, diarrhea) in 30-40% of users because it's poorly absorbed and accumulates in the gut, disrupting intestinal motility. DHB is absorbed more efficiently in the small intestine, then converted BACK to berberine in the body — getting the same AMPK activation and glucose-lowering effects at 1/5 the dose with far fewer GI side effects. GlucoVantage® (NNB Nutrition) is the branded DHB with the most data.
Standard berberine has only 5% oral bioavailability — 95% stays in the gut (causing GI distress) or is metabolized by gut bacteria. DHB is the reduced form (2 additional hydrogen atoms) that crosses the intestinal epithelium more efficiently. Once in systemic circulation, tissue oxidases convert DHB back to berberine, which then activates AMPK, inhibits mitochondrial complex I (reducing ATP/AMP ratio → AMPK activation), and produces all the downstream metabolic effects (glucose lowering, lipid reduction, anti-inflammatory). Think of DHB as a "prodrug delivery system" for berberine that skips the gut-accumulation problem.
ALL berberine interactions apply — DHB becomes berberine in the body. See `berberine.md` for complete interaction table.
Reviewed by the Scan Dose Research Team and Clinical Advisory Board | Last updated:
Not medical advice. Based on published clinical research and systematic reviews.