Educational Content: This article is for informational purposes only and does not constitute medical advice. Always consult a healthcare provider for diagnosis and treatment.

Definition of Lactase

Medically reviewed by Min Clinic Staff | Updated: January 2026

Lactase: Enzyme that breaks down the milk sugar lactose into glucose and galactose. Persons with a deficiency of lactase (alactasia) in the gut can develop abdominal cramping and diarrhea after ingesting milk products.