Immediately after weight-loss treatment, sustaining sufficient vitamin B12 levels is vital because the surgical procedure alters your gastrointestinal tract, impairing pure B12 absorption. B12 supports nerve functionality, blood cell generation, and DNA synthesis; deficiencies can cause neurological problems and anemia. Continuous supplementation with large-dose B12 and standard check... http://www.amazon.com/Bariatric-Multivitamin-Antioxidants-Sublingual-Methylcobalamin/dp/B0FW6GZ78Q