Vitamin B12
Methylcobalamin or cyanocobalamin. Dietary Supplement, vitamin.
This page describes what Vitamin B12 is and its known risks. It is not medical advice and not a guide to using it. Many of these substances are prescription-only or illegal to use without a prescription. Speak to a doctor.
- Class
- Dietary Supplement
- Legal status
- Over-the-counter (unrestricted)
- Half-life
- ~6 days (plasma)
- Liver strain
- None at typical doses
- Kidney strain
- None at typical doses
- Converts to estrogen
- None
- Suppresses natural hormones
- Not typically
Medical uses
- B12 deficiency
- Pernicious anaemia (injections)
What it does in the body
Hematologic
- Needed for red blood cell production and nerve function
Forms, half-life and detection
| Form | Half-life | Reported detection window |
|---|---|---|
| Oral (tablet/spray) or injectable | ~6 days (plasma) | N/A (not a banned substance) |
Side effects and health risks
General
- Very well tolerated; excess is excreted
Related compounds
Questions
What is the half-life of Vitamin B12?
About ~6 days (plasma). Half-life is the time for the level in the blood to fall by half.
How long is Vitamin B12 detectable?
Testing windows of N/A (not a banned substance) are reported, depending on the test and the person.
Is Vitamin B12 legal?
Over-the-counter (unrestricted). Laws differ by country and change; check the rules where you live.
What blood tests matter with Vitamin B12?
Ask a doctor which tests suit you.
What are the side effects of Vitamin B12?
General: very well tolerated; excess is excreted.
For information only, not medical advice. MyoStats is a tracking tool used at your own discretion. Speak to a doctor before changing your training, diet, medication or anything you take.