Oct 30, 2025 · Understand what is the normal range of B12 by age, from infants to older adults. Learn about factors affecting B12 levels, deficiency symptoms, and optimal health.

At this time, we believe normal serum B12 levels should be greater than 550 pg/ml. For brain and nervous system health and prevention of disease in older adults, serum B12 levels should be …

Jul 8, 2025 · A vitamin B12 test can tell how much B12 you have in your body. Serious symptoms can come with having too much or too little and may be a sign of another condition.

200 to 900 picograms per millilitre (pg/mL) – This is the general healthy range. Below 200 pg/mL – Indicates a possible deficiency, which may need treatment. Above 900 pg/mL – Usually not harmful, …

Mar 31, 2024 · Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or may test different samples. Talk to your provider about what your specific …

Aug 14, 2025 · Find out what normal B12 levels are by age, signs of deficiency like fatigue and nerve pain and tips for women over 50 to boost their B12 absorption.

Jan 9, 2024 · A vitamin B12 level test checks the amount of vitamin B12 in the body. Normal levels usually range from 200 to 900 picograms per milliliter, but the way of measuring will depend on the …

Dec 2, 2025 · Normal vitamin B12 levels range from 160 to 950 pg/mL. Values within this range indicate sufficient vitamin B12 to support bodily functions. Keep in mind that some labs use different …

Apr 13, 2025 · Definition of serum B12 reference ranges and interpretation guidance for adults, children, pregnancy, and borderline values, with notes on pernicious anaemia and antibodies.

Jul 30, 2024 · Normal levels of B12 for adults should be more than 250 pg/mL from a B12 biomarker test. Learn the normal levels by age and how much you need to take daily in order to meet your …