“…Furthermore, intramuscular supplementation in an oily depot form may lead to VitD levels being better sustained over time. In fact, some studies of BPD patients have shown low VitD levels [7,8,17] and high PTH levels [7,8,[17][18][19] approximately 1-4 years following surgery despite VitD oral supplementation, whereas one study found that the VitD deficiency and PTH elevation post-BPD was resolved in the majority of patients using oral supplements [20]. Also, Marceau et al [7] found that, in a study of 33 BPD patients, one-third of study participants self-reported non-compliance with oral VitD and calcium supplements.…”