On November 5, the Ho Chi Minh City Department of Food Safety recommended that people should not use weight loss products called "yan Collagen" of unknown origin.
Previously, the Food Safety Department (Ministry of Health) said that the authorities are checking and verifying the production, trading and advertising activities of weight loss products such as belly fat-reduced apple candy, N-Collagen Lemon Plus, N Collagen Dong antiseptic and bird's nest Plus+... These products are widely promoted online, with packaging stating Hoang Chau Pharma Company Limited.

In May 2025, the Food Safety Department (Ministry of Health) requested the Ho Chi Minh City Department of Food Safety and the Hanoi Food Safety and Hygiene Department to inspect, verify production activities and take samples to test a number of products advertised by individuals nicknamed "Ngan Collagen".
Through post-inspection work, the Department discovered that N - Collagen Import-Export Company Limited in Ho Chi Minh City, because "Ngan Collagen" promoted products such as belly fat-reduced apple candy, N-Collagen Chanh Plus... showed signs of violating regulations on advertising and advertising food products. The results of the review on the public service system showed that the Department had not yet issued a Certificate of Receipt of Product Declaration Registration and a Certificate of advertising content for the above products.

These products are labelled as supplementary foods, with distribution and production addresses in Ho Chi Minh City and Hanoi. In which, Hoang Chau Pharm and Bequen Company are responsible for product quality; the manufacturing units are Vesco Pharmaceutical Company Limited and Visco Pharmaceutical Company Limited (both in Hanoi).

In early June, after a period of silence, Ngan Collagen spoke up to confirm that her company's products were "all licensed and legally inspected", and at the same time published many documents to prove it. However, this is not the first time Ngan Collagen's enterprise has been involved in violations. In 2021, the company was fined 35 million VND by the Ho Chi Minh City Department of Health Inspectorate for false advertising of beauty products.
Although the authorities have warned many times, as of November 6, Lao Dong recorded, on commercial floors, or social networking sites, many products of N-Collagen Bich Ngan are still being advertised for sale. There is even a booth selling all the products of Ngan Collagen, selling products such as the N-Collagen bird's nest combo set, the all- course white combo, the Serum for cheek paint, collagen ginseng cream...
Ngan Collagen, real name Tran Thi Bich Ngan, from Ca Mau, lives and does business in Can Tho. On social networks, she built the image of a luxurious "female" who achieved success thanks to her business in cosmetics and beauty foods.
With a TikTok channel of more than 620,000 followers, Ngan Collagen regularly posts promotional videos for products such as skin care creams, acne treatment, melasma treatment, bird's nest collagen, weight loss products, etc. The videos are arranged to be eye-catching, hitting the psychology of women who want to improve their beauty quickly. On platforms such as Facebook and TikTok, she has repeatedly affirmed that her products help "rejuvenate the skin, make it white from within, support hormones and comprehensive beauty".