LIBBY LIBRARY · TOPIC
vitamins
2 articles tagged vitamins.
4 min read
Vitamin B12: What It Is and How to Read Your Blood Level
What a vitamin B12 test measures, the reference ranges labs actually use, why the 'gray zone' needs confirmatory tests, and how to track B12 over time — plus why 'optimal' is debated.
vitaminsnutrientslab resultsmarker glossary
4 min read
Vitamin D (25-Hydroxyvitamin D): What It Is and How to Read Your Level
What a vitamin D test measures, the deficiency thresholds the Endocrine Society and IOM actually use, and how to track 25-OH-D over time — plus why 'optimal' is genuinely debated.
vitaminsnutrientslab resultsmarker glossary