How much berberine should you take per day?

The common berberine dose is 500mg taken two to three times per day (1,000-1,500mg total), with meals. The split dosing matters: berberine has a short half-life, and taking it with food both blunts the post-meal glucose rise and reduces the GI upset it's known for. Importantly, there's no dose consensus among the five experts, and only three discuss it at all.

Peter Attia is the most clinically detailed. He treats berberine as a 'weak AMPK activator' and, tellingly, uses it mainly to lower LDL cholesterol (via PCSK9), not blood sugar — for glucose he prefers pharmaceutical metformin. He uses it empirically, adjusts by patient response, and recommends the Thorne brand for pharmaceutical-grade quality. Andrew Huberman describes berberine as a potent glucose-disposal agent but warns about hypoglycemia and says he personally avoids it (along with metformin and rapamycin) for longevity. Mark Hyman is the most positive, framing it as an AMPK-activating anti-aging tool and a gut antimicrobial. Patrick and Johnson don't cover it.

The practical protocol: start at 500mg once daily with your largest meal to assess tolerance, then build toward 500mg two to three times daily with meals. Because berberine lowers blood glucose, anyone on diabetes medication should use it only under medical supervision. And know that the popular 'nature's metformin' framing oversells it — see our full berberine vs metformin breakdown for why.