Sources checked on October 10, 2026. This guide replaces standalone reviews that lacked documented product-specific analysis. We have not purchased or laboratory-tested these products. Examples below are label comparisons, not endorsements, a ranking, or proof that a brand works better. We do not assign review scores or link to unverified marketplace listings.
Thorne Berberine — 60 capsules. The Thorne product page lists a two-capsule serving with 450 mg berberine HCl and 550 mg berberine phytosome. The phytosome amount is the weight of a complex, not a stated equivalent amount of pure berberine HCl. It would be misleading to describe this as 1,000 mg of interchangeable HCl or assume its effects match HCl trials milligram for milligram.
The page's title says “30 Servings,” but its extracted ingredient section also displays “Servings Per Container: 60.” With 60 capsules and a two-capsule serving, the arithmetic gives 30 servings. This discrepancy is a reason to check the physical label before buying, not to silently choose the larger number. Thorne describes third-party quality testing on the page; we have not verified a current lot report or independent certification for this berberine product. Do not transfer a sports certification from a different Thorne product.
NOW Foods Berberine Glucose Support — 90 softgels. The NOW product page lists 400 mg berberine HCl and 700 mg MCT oil per softgel, including 238 mg capric acid. It gives suggested use as one softgel three times daily with food. This is not the 500 mg capsule described in some older reviews, nor is it evidence for a formula containing silymarin or alpha-lipoic acid.
NOW states “Made and quality tested in the USA with globally sourced ingredients” and says the product is produced in a GMP facility. Those are attributed manufacturer disclosures, not our factory audit or independent lot verification. The listed bovine gelatin and beeswax also matter to buyers seeking a vegan product.
Comparison limits. These labels document different formulations and serving sizes. They do not establish clinical superiority, a lower adverse-event rate, or equivalent absorption. We do not infer which parent company operates a factory. For brands without a substantiated matching label and product destination, we do not provide a recommendation or substitute an unrelated brand.
Record the seller, product variant, currency, date, capsule count, serving size, and whether the price requires a subscription. Use the one-time purchase price for the baseline; show promotions separately. Taxes and shipping are excluded from the example and should be added to your own comparison.
On October 10, 2026, Thorne's page displayed US $44 for 60 capsules, before tax and shipping, with a separate $39.60 subscription offer. At two capsules per labeled serving, $44 ÷ 30 = $1.47 per serving. At two capsules daily, the illustrative 30-day cost is $44; at four daily it is $88. These are arithmetic scenarios within the page's suggested-use range, not dosing advice or a live price quote.
For any bottle: 30-day cost = bottle price × (daily capsule count × 30) ÷ capsules per bottle. For a single HCl formulation, cost per 500 mg can be calculated from the total labeled HCl content. Do not add phytosome-complex weight to HCl weight for that calculation. We do not quote a NOW monthly price because the fetched page displays multiple sizes and sale choices without a sufficiently clear selected-variant price for a fair comparison.
NCCIH's berberine summary says weight-loss evidence is inconclusive, with inconsistent results and substantial risk of bias in many studies. Trials often involve people with diabetes or other health problems and use differing formulations. That evidence does not validate every bottle or show that berberine replaces metformin, semaglutide, or other prescribed treatment.
NCCIH reports gastrointestinal side effects and medicine interactions, including cyclosporine. Berberine may be unsafe during pregnancy and breastfeeding and is unsafe for infants. Discuss use with a clinician, especially if taking medicines; do not change prescribed treatment based on a supplement comparison.
Ask for a dated certificate of analysis tied to the bottle's lot, identifying the laboratory, methods, potency results, and contaminant limits. A GMP statement describes a manufacturing standard, not clinical efficacy. A corporate testing policy is not necessarily the report for the finished product in your hand. Missing documentation means “not verified,” not “passed.”
Return to the Berberine Learn hub.