Dr. Sarah Kim

About

Sarah holds a PhD in Nutritional Biochemistry and has published peer-reviewed research on micronutrient absorption and bioavailability — which is exactly why she gets frustrated with supplement labels that list magnesium without specifying the form (oxide vs. glycinate vs. threonate all absorb completely differently). She reviews vitamins, minerals, and nootropics, with a particular focus on whether the specific form used in a product matches the form studied in the research. Her collagen and omega-3 reviews are the most-cited on the site because she goes deep on molecular form, oxidation testing, and manufacturing temperature controls that most reviewers skip. She's not anti-supplement — she takes several herself — but she believes consumers deserve to know what the evidence actually supports, which is often narrower and more conditional than the bottle suggests. Her PhD is from Johns Hopkins Bloomberg School of Public Health.

7 years of experience in supplement science.