Vitamin B12 Absorption by Age

Estimate effective vitamin B12 absorption from dietary and supplemental sources based on intrinsic factor availability, age-related atrophic gastritis risk, and dose.

Weight
Height
Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
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How It Works

Estimate effective vitamin B12 absorption from dietary and supplemental sources based on intrinsic factor availability, age-related atrophic gastritis risk, and dose

Each component has a specific meaning:

  • Dietary — The dietary recorded for the scenario being assessed.
  • Supplemental sources based on intrinsic factor availability — The supplemental sources based on intrinsic factor availability recorded for the scenario being assessed.
  • Age-related atrophic gastritis risk — The age-related atrophic gastritis risk recorded for the scenario being assessed.
  • Dose — The dose recorded for the scenario being assessed.

Note: Interpret the b12 absorption by age result against the thresholds and context described above.

How to Use

Enter the dietary, supplemental sources based on intrinsic factor availability, age-related atrophic gastritis risk, dose for the scenario you are assessing. Estimate effective vitamin B12 absorption from dietary and supplemental sources based on intrinsic factor availability, age-related atrophic gastritis risk, and dose. Use the b12 absorption by age result to inform your calculation.

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Frequently Asked Questions