Quick answer: Berberine has the strongest human evidence for blood sugar at about 1,000 to 1,500 mg a day; chromium and cinnamon show mixed results. Glyco Reset's amounts are not disclosed.
Berberine
Several meta-analyses of trials in type 2 diabetes report lower fasting glucose and A1C with berberine, usually 500 mg two or three times a day. It commonly causes stomach upset and interacts with many medicines. PubMed search: berberine meta-analyses.
Chromium
The NIH Office of Dietary Supplements says trials of chromium for blood sugar have given mixed results, with some showing small benefits and others none. NIH chromium fact sheet.
Cinnamon
NCCIH describes cinnamon studies as inconsistent. Cassia cinnamon, the most common type, contains coumarin, which can harm the liver at high intakes. NCCIH on cinnamon.
What it means for the drops
The ingredient choice is sensible. Whether the drops deliver meaningful amounts is unknown; see the missing doses and the full ingredient guide.
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General information, not medical advice. Glyco Reset is a dietary supplement and is not intended to diagnose, treat, cure or prevent any disease.