Labs · Nutrition
B12 deficiency in menopause
B12 absorption declines with age. Serum B12 < 400 warrants MMA testing.
Key points
- Check MMA if borderline
- Methyl-B12 preferred
- Recheck at 3 months
Frequently asked questions
Serum B12 normal but symptomatic?
Order MMA and homocysteine.
Best form?
Methylcobalamin sublingual or injection.
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Medically reviewed by Kindr Health Clinical Team · Last reviewed 2026-06-19. Compounded medications are prepared by FDA-registered 503A pharmacies and are not FDA-approved drug products.