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On the other hand, certain studies have demonstrated the overexpression of GLP-1R in brain tumors, embryonic tumors, gut and lung neuroendocrine tumors, including other endocrine tumors like Pheochromocytomas, raising concerns that existing GLP-1RAs can contribute to tumor growth in humans (Shilyansky et al., 2025

Lab work and medical monitoring Regular lab work during tirzepatide treatment helps catch potential issues early

These symptoms are largely related to slowed digestion

Presence without relevance

Natural GLP-1 Supplement: Struggling with cravings

Phentermine is also considered a controlled substance, so if you have a history of substance abuse, you could become addicted to this drug, Lazarus says