Global Vitamin B Test Market By Product Type (Vitamin B12 Test, Folic Acid (Vitamin B9) Test, and Others), By Application (ELISA, Lateral Flow Assay, and High-performance Liquid Chromatography), By End-user (Hospitals & Clinics, Diagnostic Centers, and Homecare Settings), Region and Companies – Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2025-2034