Mulberry Leaf Extract standardized for 1-Deoxynojimycin (DNJ) has emerged as one of the most in-demand botanical ingredients for blood sugar management formulations. Here is what procurement managers and formulators need to know.

What Is DNJ?

1-Deoxynojimycin (DNJ) is an iminosugar compound found in mulberry leaves (Morus alba). It works as a competitive inhibitor of alpha-glucosidase, the enzyme in the intestinal brush border that breaks down complex carbohydrates into glucose. By slowing carbohydrate digestion, DNJ helps moderate postprandial (after-meal) blood glucose spikes.

This mechanism is distinct from, and complementary to, the action of Acarbose and Miglitol — pharmaceutical alpha-glucosidase inhibitors — but at much lower potency, making it suitable as a daily dietary supplement ingredient.

Key Specifications

When sourcing Mulberry Leaf Extract standardized for DNJ, the following specifications are most commonly requested:

• DNJ 1%: Entry-level specification, common in general wellness products
• DNJ 5%: Standard specification for blood sugar support supplements
• DNJ 10%: Premium specification for clinical-dose formulations
• DNJ + Flavonoids combination: Many suppliers offer 5% DNJ combined with 10-20% flavonoids for a broader metabolic support profile

Always verify the DNJ assay method — HPLC is the standard. UV methods can overestimate DNJ content and have caused compliance issues for buyers in the past.

Application Notes

Mulberry Leaf Extract DNJ is typically formulated into:

• Capsules / tablets: 200-500 mg per daily dose, typically taken with carbohydrate-containing meals
• Functional beverages: Hot tea formulations are traditional; modern formats include RTD drinks and powdered sticks
• Combination formulas: Often combined with Berberine, Chromium, or Gymnema sylvestre for synergistic blood sugar support

Quality Considerations for Procurement

Key quality parameters to verify when sourcing Mulberry Leaf DNJ extract:

• Source verification: Morus alba (white mulberry) — some products misidentify species
• Extraction solvent: Water extraction is standard; verify no residual solvents if using ethanol-extracted products
• Pesticide residue: Important for products marketed as "natural" or "organic"
• Heavy metals: Standard testing per batch
• DNJ stability: DNJ content can degrade in storage — verify shelf life data and storage conditions