top of page

Best Lab is a contract testing laboratory providing service for analysis of ingredients and finished products of dietary supplements, nutraceuticals and foods, as well as research and development of new products in collaboration with scientists in the universities and institutes.    


The experienced scientists and advanced instruments with high technology enable our lab to provide reliable service for the nutraceutical and dietary supplement industries. We can help you ensure the safety and quality of your raw material ingredients and finished products by testing the microbial, heavy metals and pesticides, qualitative and/or quantitative analysis of the materials, performing stability tests of the products. We can also help you identify the authentic and adulterated materials, develop analytical methods for your special needs,  provide chemical isolation and identification of components in herbs for your R&D projects. 

Willow Liu, Ph.D.


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 Nakanish, Prof. Norman Farnsworth, Prof. 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.

Dr. Willow

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

Profile Pic.jfif

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.


Brian Guo, Ph. D

Chief Scientist

Lab Manager


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.

bottom of page