News & Events · Green Business Matching · 4 Nov 2026

Dr. Ruột: the father who quit banking and spent ten years on resistant starch from mung beans because his son was constipated

Nguyễn Tuấn Dương used to work in banking, earning VND 40–50 million a month. The turn in his life began with his youngest son, who suffered from chronic constipation that no treatment would shift. He tinkered at home, boiling mung-bean water for the boy to drink; the boy got better, and that was the start of nearly ten years of research with his colleagues. His savings all went into it, to the point where his family at one stage suspected a "gambling habit" because the money kept vanishing. The company lost money for years and only began turning a profit around 2021.

GBM NetworkĂn Chay TV

AnchayTV · Official media partner of Green Business Matching Green business stories 33/35 from Green Business Matching Day Vietnam, 4 November 2026. Original on gbm.network ↗

Guests and companies at Green Business Matching Day Vietnam, Lumi Hub, 4 November 2026

Vietnam Gut Health Care Joint Stock Company · Hà Nội – Bắc Ninh · tinhbotkhang.vn

In 2022 he appeared on season five of Shark Tank Vietnam and opened his pitch with a model of human stool, to talk about the thing nobody wants to talk about: gut health. Shark Liên and Shark Hưng committed VND 4 billion for 36 percent. "It's like a boxing match: whoever takes the pain best wins," he said of starting a business. "Don't walk the road someone else has already chosen."

From 0.14 percent to 14 percent

Resistant starch is the fraction of starch that is not digested in the small intestine but passes to the large intestine, where it feeds beneficial bacteria. Dr. Ruột makes RS3 resistant starch from Vietnamese mung beans (bought in Hải Dương and Hòa Bình, with a 3-hectare growing area under development in Mộc Châu) by a physical process of 12 stages, raising the resistant-starch content from 0.14 percent in ordinary mung beans to around 14 percent; the Premium line adds oats and banana, and the Kids line comes in chocolate flavour for children from 12 months. The content has been verified by the National Institute for Food Control; the factory in Bắc Ninh is certified to ISO 22000:2018 and Halal; the company holds three utility-solution patents on its production process, signed a three-way partnership with VKIST and Hannari (Korea) in 2024, and has sold into China, Hong Kong and Macau through Taobao. Its published customer count: more than 100,000 by 2026.

Since 2022, Dr. Ruột has worked alongside the Vietnam Association of Families of Children with Cerebral Palsy, supporting around 100 children with medication-induced constipation. The mission it has set itself: "For a Vietnam free of gut disease."

At Green Business Matching Day

India has more people with diabetes than any other country, and Dr. Ruột is running a ministry-level research project on resistant starch for diabetics. That is why the story of a product made entirely from Vietnamese mung beans has a place at Lumi Hub on the morning of 04.11.2026.

Video · 0:27 · Green business stories: Dr. Ruột · Chuyện doanh nghiệp xanh: Dr. Ruột · Ăn Chay TV

Green Business Matching Day Vietnam is co-organised by INCHAM with Canopus, AnChay.TV and Chay Vietnam, with the support of the Consulate General of India in Ho Chi Minh City, Ministry of External Affairs of India.

Based on material provided by the company; compiled by the organisers of Green Business Matching Day Vietnam as a gift to the businesses that joined the day.

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