A common and affordable supplement for patients taking Voglistar GM 1 is Vitamin B₁₂, as Metformin (a component of Voglistar GM) can reduce its absorption and may cause a deficiency with long-term use. Other supplements, such as vitamin D or calcium, may also be considered, but the choice should be personalized based on your nutritional needs, medical conditions, and other medications. Always consult your doctor before starting any new supplement to avoid potential drug interactions, particularly low blood sugar (hypoglycemia).