In various implementations, berberine metabolites, such as dihydroberberine and/or tetrahydroberberine, may be administered to manage blood glucose levels, increase ketone levels (e.g., blood concentration of ketones), and/or for therapeutic purposes in humans. The administration of a pharmaceutically effective amount of berberine metabolites, such as dihydroberberine, may reduce fasting blood glucose levels, improve glucose tolerance, and/or improve blood ketone response. In some implementations, berberine metabolites may be administered with one or more other compounds.