Can saliva and tears replace blood tests for vitamin D and glucose?
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By Dr. Sanchari Sinha Dutta, Ph.D. Reviewed by Lauren Hardaker Sep 2 2025 In a small but revealing study, scientists discovered that tears strongly mirror blood glucose and saliva may reflect vitamin D status. This could lead to less invasive ways to monitor chronic health. Study: Tears and Saliva as Biological Matrices for Vitamin D and Glucose Assessment: A Pilot Study. Image credit: Shotmedia/Shutterstock.com A new study published in the journal Physiologia explores the feasibility of saliva
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