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Detailed medicine guidance

Pregnancy, breastfeeding and fertility while having hydroxocobalamin

NHS medicines information on hydroxocobalamin and whether you can have it while pregnant or breastfeeding.

About this information

This NHS content is written for people in England. Medicine names, availability, prescribing and services may differ in other countries.

Hydroxocobalamin and pregnancy

Hydroxocobalamin can be used during pregnancy.

It's important that a vitamin B12 deficiency is correctly treated to make sure that you and your baby are healthy.

Hydroxocobalamin and breastfeeding

You can have hydroxocobalamin while you're breastfeeding.

Hydroxocobalamin is a natural part of breast milk. When you have hydroxocobalamin injections as a supplement or treatment, it passes into your breast milk in low amounts and helps your baby to stay healthy.

If your baby also has vitamin B12 deficiency, they will still also need treating themselves.

If you notice your baby is not feeding as well, or you have any concerns about your baby, contact your doctor, pharmacist, health visitor or midwife.

Hydroxocobalamin and fertility

There's no evidence to suggest that taking hydroxocobalamin affects fertility in either men or women.

Meds New IA (H2) - Pregnancy non-urgent care card

Tell your doctor if you're:

  • trying to get pregnant
  • pregnant
  • breastfeeding

View the original NHS website page ↗. Refreshed 19 August 2026.

Licensed under the Open Government Licence v3.0 ↗. MyPHU is independent and is not endorsed by the NHS.

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