As one of the industry's fastest-growing and experienced suppliers of dietary supplements manufacturer, we're always proud of our employees!

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Dr. Willow Liu


Dr. Liu is a well-trained natural product chemist with 35 years of experience in research, teaching, and clinical practice of natural products. She has Successively worked in the labs of several world-famous natural product experts in China (Prof. Xinsheng Yao), Germany (Prof. Rudolf Bauer), and the USA (Prof. Koji NakanishProf. Norman FarnsworthProf. John Pezzuto). She taught Phytochemist, Pharmacology, Nutrition, Pharmacology of Chinese medicine, and Nutrition of Chinese Medicine in China and the USA. As a licensed acupuncturist, she combines the knowledge of modern and traditional medicine in her practice. Because of her extensive experience and knowledge about research on herbal medicine, she was invited by Wiley, the well known academic publisher to write and edit the English book Traditional Herbal Medicine Research Methods - Identification, Analysis, Bioassay, Pharmacological and Clinical Studies. She is also the founder and chairman of the non-profit organization American Association of Chinese Herbs.

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Dr. Liu's Education, Research & teaching Background:
Post-doctoral Research Scientist at Columbia University (New York)

Ph.D. of Natural Product Chemistry (China)

M.S. of Medicine (China)

B.S. of Chinese Material Medica (China)

Research Fellow of Alexander von Humboldt Foundation (Germany)

Professor in Liaoning College of TCM (China)

Visiting Research Assistant Professor in College of Pharmacy, University of Illinois at Chicago (Chicago, USA)

Professor (Part-time) in South Baylo University, College of Acupuncture and Oriental Medicine in Southern California University of Health Science, and Alhambra Medical University


Dr. Liu with the former German president Roman Herzog in 1996

Brian Guo

Chief Scientist & Lab Manager

Brian Guo, Ph. D., is a natural product chemist with interest and experience in the chemical and biological analysis of botanicals. He received his doctorate in Pharmacognosy from the University of Illinois at Chicago under the mentorship of Dr. Chun Tao Che, the Harry H. S. Fong Professor of Pharmacognosy. His research focused on the isolation and elucidation of novel bioactive phytochemicals from traditional medicinal plants. He was also trained in analytical chemistry techniques for natural product structure elucidation and metabolomics. Previously, he received

his B.S. and M.S. in Biomedical Engineering from Northwestern University, followed by working in Renal Product Development at Baxter Healthcare in Round Lake, Illinois.

Hyunsik Choi

Senior Chemist

Mr. Choi attained his B.S. in Oriental Pharmacy and M.S. in Natural Product Chemistry from Kyung Hee University, a top ranked university of South Korea in the natural product research field. As a nationally certified herbal pharmacist in South Korea, he has 14 years of botanical drug discovery experience in the pharmaceutical industry. He is a well-trained scientist for the chemical profiling and fingerprinting of raw herbal materials or active pharmaceutical ingredient (API) for batch-to-batch consistency. Plus, he has developed and validated analytical methods for herbal extracts combined with extraction optimization research by response surface method. As Project Head, Mr. Choi directed crafting methods to verify the activity of botanical drugs, singling out any active compounds that were responsible for positive results, and overall non-clinical and clinical study (Phase 2a). The Korean Ministry of Health and Welfare provided significant financial support for Mr. Choi’s IBD research project.

Yidi Gao

Operation Director

Ms. Gao received her Bachelor’s degree in Bioengineering in Northwest University in China and Master’s degree in Analytical Chemistry in California State University Los Angeles. As a senior Research & Development Chemist, she has over 5 years’ experience in dietary supplements formulation and projects development. She is also familiar with FDA and cGMP regulations and cooperated with QA to get NSF Certificate for our company. As a team leader, Ms. Gao directed many different kinds of nutritional products. Such as ChromaDex Tru Niagen® Capsule, PipingRock Herbal Capsules, MODERE Optimize Hydrogen-Producing Tablets, Organifi Red Juice Powder and MusclePharm Combat Powder etc. Over 7 years studying and working experiences in the USA makes her a good cross-cultural communicator, she helps many companies work in exporting products to China. 

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Kaylee Jin 

QA manager

Ms. Kaylee Jin received her bachelor’s degree in Food science and Technology in China and earned the post-baccalaureate and master’s degrees in Human Nutrition at California State University, Northridge. A well-trained quality assurance manager with strong managerial experience in both food and dietary supplement processing companies and with comprehensive knowledge of quality compliance, regulatory affairs, and product safety. While working as a quality leader in a frozen food processing company, she managed and improved the company’s quality system to ensure full compliance with GMP quality regulations and navigated various audits and USDA inspections. Joined EXPERT PHARMACEUTICAL as a Quality Assurance manager in year 2019 in developing all aspects of Quality system and product safety plan as well as enforcing strict GMP implementation throughout production, and hence, successfully pass the NSF audit with an outstanding grade.