This detoxification reaction is carried out by the glyoxalase system
Yap LE, Hunt JE, Turner RS (2024) Aging as a target for the prevention and treatment of Alzheimers disease
SRF modulates seizure occurrence, activity induced gene transcription and hippocampal circuit reorganization in the mouse pilocarpine epilepsy model

Most Common Side Effects (12mg Dose) When Side Effects Improve Most side effects follow a predictable pattern: Peak: First 12 weeks at a new dose or when starting the medication Improvement: Week 34 as your body adapts (receptor desensitization, GI tract adjustment) Stabilization: By week 6+, most users report minimal or no side effects at the same dose Recurrence: Symptoms may temporarily return when you increase to the next dose (usually milder than initial onset) Managing Side Effects Nausea Eat smaller, more frequent meals instead of large portions Avoid fatty, greasy, or spicy foods (they slow gastric emptying further) Stay upright for 3060 minutes after eating Ginger tea, peppermint, or over-the-counter anti-nausea medications (consult your provider) Diarrhea Stay hydrated (electrolyte drinks if severe) Reduce fiber temporarily if diarrhea is acute Probiotics may help stabilize gut microbiome Anti-diarrheal medications (loperamide) if needed, under medical guidance Constipation Increase water intake (aim for 2+ liters daily) Add fiber gradually (fruits, vegetables, psyllium husk) Light exercise stimulates bowel motility Stool softeners or osmotic laxatives (MiraLAX) if needed When to Stop and Seek Medical Attention Contact a healthcare provider immediately if you experience: Severe, persistent abdominal pain (could indicate pancreatitis) Signs of dehydration from vomiting/diarrhea (dizziness, dark urine, rapid heartbeat) Allergic reaction (hives, difficulty breathing, swelling of face/throat) Vision changes or severe headaches Symptoms of gallbladder problems (pain in upper right abdomen, yellowing of skin/eyes) For side effect management strategies and what to watch for long-term, see our guide: Retatrutide Side Effects: Complete Guide & Management Strategies

Therefore, one possible mechanism for the GI intolerance associated with metformin may relate to altered transport of serotonin or to a direct serotonergic-like effect of metformin