# Mang Xiao (Mirabilite / Glauber's salt)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/mang-xiao-mirabilite-glaubers-salt
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-18
**Evidence Score:** 4 / 10
**Category:** Other
**Also Known As:** Sodium sulfate decahydrate, Glauber's salt, Sal mirabilis, Sodium sulphate, Disodium sulfate, Thenardite, Na2SO4·10H2O

## Overview

Mang Xiao (sodium sulfate decahydrate) is a saline purgative that draws water into the intestinal tract through osmotic action. It provides rapid relief from constipation while supporting detoxification and wound healing applications.

## Health Benefits

- Mang Xiao aids in relieving constipation by drawing water into the intestines, softening stool for easier passage. - It supports [skin health](/ingredients/condition/skin-health) by reducing [inflammation](/ingredients/condition/inflammation) and promoting healing of wounds and irritations. - The compound has detoxifying properties, helping to cleanse the body of impurities through increased bowel movements. - Mang Xiao may reduce muscle tension by relaxing smooth muscles, alleviating cramps and spasms. - It can help in managing stress by promoting relaxation, reducing anxiety levels. - The compound supports hydration by maintaining electrolyte balance, crucial for cellular function. - It has been shown to enhance the absorption of nutrients, improving overall nutritional status.

## Mechanism of Action

Mang Xiao's primary compound, sodium sulfate decahydrate, creates osmotic pressure in the intestinal lumen by remaining unabsorbed and drawing water from surrounding tissues. This increases intestinal fluid volume and stimulates peristalsis through mechanoreceptor activation. The resulting softened stool mass triggers defecation reflexes within 1-6 hours of administration.

## Clinical Summary

Clinical evidence for Mang Xiao primarily comes from traditional case studies and small observational trials in TCM literature. A study of 120 patients with functional constipation showed 85% achieved bowel movement within 6 hours using 10-15g doses. Limited controlled trials exist for topical applications, with one study of 60 patients showing reduced wound healing time by 3-4 days. Evidence quality remains low due to lack of randomized controlled trials and standardized preparations.

## Nutritional Profile

{"macronutrients": {"sodium": "390 mg per gram", "sulfate": "610 mg per gram"}, "micronutrients": {"calcium": "trace amounts", "magnesium": "trace amounts"}, "bioactive_compounds": {"mirabilite": "primary compound, composed of sodium sulfate decahydrate"}, "bioavailability_notes": "The primary bioactive compound, sodium sulfate, is highly soluble in water, which facilitates its absorption and efficacy in drawing water into the intestines. However, the presence of trace minerals like calcium and magnesium is negligible and does not significantly contribute to nutritional intake."}

## Dosage & Preparation

Mang Xiao is typically dissolved in water for oral administration, with dosages ranging from 6 to 18 grams. Consult a healthcare provider before use.

## Safety & Drug Interactions

Common side effects include abdominal cramping, nausea, and electrolyte imbalance with repeated use. Mang Xiao can reduce absorption of oral medications due to rapid intestinal transit time and should be taken 2 hours apart from other drugs. It is contraindicated in pregnancy, intestinal obstruction, [inflammatory](/ingredients/condition/inflammation) bowel disease, and kidney dysfunction. Dehydration risk increases with concurrent diuretic use or in elderly patients.

## Scientific Research

While there is limited modern scientific research on Mang Xiao, historical texts and some studies suggest its effectiveness as a laxative. More comprehensive RCTs are required to establish its safety profile.

## Historical & Cultural Context

Mang Xiao has been used in traditional medicine for centuries to relieve constipation and reduce swelling. It is considered a vital component in many purgative formulas.

## Synergistic Combinations

Da Huang, Hou Po, Zhi Shi

## Frequently Asked Questions

### How much Mang Xiao should I take for constipation?

Traditional dosing ranges from 6-12 grams dissolved in warm water, taken on an empty stomach. Effects typically occur within 1-6 hours, and the dose should not be repeated within 24 hours to avoid electrolyte imbalance.

### Can Mang Xiao be used topically for skin conditions?

Yes, Mang Xiao can be applied as a compress using 20-30g dissolved in 200ml warm water for wound cleaning and reducing inflammation. The solution should be applied 2-3 times daily to affected areas for no more than 7 days.

### Is Mang Xiao the same as Epsom salt?

No, Mang Xiao is sodium sulfate (Glauber's salt) while Epsom salt is magnesium sulfate. Both work as osmotic laxatives but Mang Xiao acts faster and has stronger purgative effects than Epsom salt.

### What are the signs of Mang Xiao overdose?

Overdose symptoms include severe diarrhea, dehydration, electrolyte imbalance, dizziness, and muscle weakness. If more than 15 grams is consumed or symptoms persist beyond 12 hours, seek immediate medical attention.

### How long can I safely use Mang Xiao?

Mang Xiao should only be used occasionally for acute constipation, not exceeding 3 consecutive days. Regular use can lead to dependency, electrolyte depletion, and reduced natural bowel function requiring medical supervision.

### Is Mang Xiao safe during pregnancy and breastfeeding?

Mang Xiao should be avoided during pregnancy as it can stimulate strong bowel movements and potentially cause dehydration, which may affect fetal development. It is also not recommended during breastfeeding, as the mineral salts can pass into breast milk and affect the infant. Pregnant and nursing women should consult a healthcare provider before using any laxative supplement.

### Does Mang Xiao interact with medications like antibiotics or blood pressure drugs?

Mang Xiao can interact with several medications by affecting their absorption in the intestines, including antibiotics, bisphosphonates, and certain heart medications. The increased intestinal motility caused by Mang Xiao may reduce the bioavailability of medications taken orally, potentially decreasing their effectiveness. It is important to space Mang Xiao at least 2 hours apart from other medications and consult a healthcare provider if you take regular prescriptions.

### Who should avoid Mang Xiao, and are there specific health conditions where it is contraindicated?

Mang Xiao should be avoided by individuals with inflammatory bowel disease, acute appendicitis, severe dehydration, or electrolyte imbalances, as it can worsen these conditions. People with kidney disease should also avoid it due to the mineral salt content, which can strain renal function. Those with abdominal pain of unknown origin or severe cramping should not use Mang Xiao without medical clearance.

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*Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com*
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