At a glance Drug class / triple agonist: GLP-1, GIP, and glucagon receptor agonist (investigational) Known direct interaction with B12 / none identified to date Indirect depletion risk / present when retatrutide is co-prescribed with metformin Metformin B12 depletion incidence / up to 30% of long-term metformin users show subnormal B12 levels Recommended baseline test / serum B12 (ideally holotranscobalamin) before starting Retest interval / every 12 months on metformin
Studies such as the SUSTAIN and STEP trials have demonstrated their benefits in both glycemic control and weight reduction, positioning GLP-1 agonists as cornerstones in the treatment of metabolic disorders
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Below 5mg/mL, oxidative degradation accelerates due to increased air-peptide surface contact
Vandetanib and cabozantinib increased progression-free survival (PFS) in a phase III trial named the Zactima Efficacy in Thyroid Cancer Assessment (ZETA) trial [19] and Efficacy of XL184 (cabozantinib) in Advanced Medullary Thyroid Cancer (EXAM) trial [20], respectively (Table 2)
This delivers a meaningful dose of vitamin B12 with each injection
