BOMSS Nutrition & Monitoring Guidelines

BOMSS: GP Guidance: Management of nutrition following bariatric surgery August 2014

Vitamin and Mineral recommendation


Multivitamin and Mineral supplement

2 x Sanatogen A-Z complete or
2 x Superdrug A-Z multivitamins or
2 x Tesco Complete Multivitamins and minerals or
2 x Lloydspharmacy A-Z multivitamins and minerals

(You will need to purchase these supplements.  If you are unable to purchase this supplement your GP will need to prescribe you with Forceval tablet once daily)



45-60mg Daily

210mg Ferrous Fumarate tablet once daily
(prescribed by GP)

100mg daily for menstruating woman

210mg Ferrous Fumarate tablet twice daily
(Prescribed by GP)

Calcium and Vitamin D

Adcal D3 chewable tablets taken twice daily (taken at least 4 hours apart from Iron supplement). You need additional Vitamin D if you are deficient.

Vitamin B12

Intramuscular injections of 1mg vitamin B12 every 3 months for the first year.  After 1 year this will depend on vitamin B12 blood tests.  

In some cases these medications may need to be altered or changed e.g. in pregnancy.

Blood tests required following sleeve gastrectomy or gastric bypass surgery:

Blood Test

How Often you should have them checked

Under 12 months since your  surgery

Over 12 months since your surgery

U + E
Vitamin D



3 and 6 months



12 months and then annually

Vitamin B12
(No need to monitor if on B12 intramuscular injections)


6 months



(Only following bypass surgery)



(Only following bypass surgery)



Additional blood tests may be required depending on other health issues (e.g. cholesterol or diabetes tests).

BOMSS Nutrition & Monitoring Guidelines