Thorne Berberine Review

This product gives berberine above the 600 milligram daily amount that worked in studies, so it is at a full dose. Berberine has strong human evidence for lowering blood sugar in people with type 2 diabetes. A pooled analysis of 37 trials in 3,048 people found it lowered fasting blood sugar and long-term blood sugar without raising the risk of low blood sugar ^[1]. A pooled analysis of 46 trials found similar drops, plus better insulin resistance, lower triglycerides and lower bad cholesterol ^[2]. In a trial of 409 adults newly diagnosed with type 2 diabetes, 12 weeks of berberine lowered long-term blood sugar by about 1.0 point versus about 0.6 on placebo, though it caused more stomach upset ^[3]. In 116 people with type 2 diabetes and abnormal blood fats, 1 gram daily for 3 months lowered long-term blood sugar from 7.5% to 6.6%, more than placebo ^[4]. In 300 adults with newly found high blood sugar, 16 weeks lowered fasting and after-meal blood sugar more than placebo ^[5]. Another pooled analysis of 28 trials found benefits, but weaker ones beyond 90 days, above 2 grams a day, or over age 60 ^[6]. Animal and cell studies are never counted.

Most of the panel recommends or uses berberine, and it is the only ingredient they discussed. Blood sugar control is the main reason, with several also citing insulin resistance, cholesterol, cravings, sleep, and gut health. Two of them take 500 mg with meals, one cites 500 mg three times with meals, and another said he felt fine on up to 750 mg or a gram with a large carbohydrate-rich meal. A few also like dihydroberberine, a related form, and one panelist mentioned a more absorbable form. For cautions, one panelist warns that taking it on an empty stomach can cause low blood sugar, headaches, dizziness, and blurred vision, and says to talk to a doctor first. Another urges care when combining it with other glucose-lowering products, one is skeptical of the evidence behind most supplements, one stopped when his diet changed, and one said it once gave him headaches and carb cravings.

Combine with: Berberine pairs well with other glucose-supporting nutrients. Alpha-lipoic acid (or R-ALA) and chromium picolinate may improve insulin sensitivity and glucose uptake, while magnesium glycinate supports insulin signaling and is commonly low in people with blood sugar concerns. Cinnamon extract (Ceylon or a standardized water-soluble form) may offer additional post-meal glucose support. Omega-3 fish oil complements berberine's lipid benefits for cardiometabolic health, and a soluble fiber such as psyllium or PGX can blunt post-meal glucose spikes. Take berberine with meals to improve tolerance and reduce GI upset. Use caution if you take meds (such as a med or insulin), since combining them can cause hypoglycemia, and avoid it during pregnancy or breastfeeding. Berberine can also interact with drugs metabolized by CYP enzymes, such as cyclosporine, so consult a healthcare provider before starting.