Choline, for example, is involved in lipid transport and metabolism (a vital part of energy storage), cell membrane signaling, and nervous system function
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its relevance to retatrutide specifically is not yet established A history of pancreatitis or significant gastrointestinal disease Gallbladder disease , including a history of gallstones or cholecystitis Diabetes mellitus , particularly if managed with insulin or sulphonylureas, due to hypoglycaemia risk Cardiovascular disease , including arrhythmias or recent cardiac events Renal or hepatic impairment , which may affect tolerability and increase the risk of dehydration-related complications Pregnancy or breastfeeding no safety data exist for retatrutide in these groups Use of oral medicines where absorption may be affected by delayed gastric emptying , such as levothyroxine or combined oral contraceptives Seek urgent medical attention if you experience severe or persistent nausea or vomiting, persistent abdominal pain (which may indicate pancreatitis or gallbladder disease), signs of an allergic reaction (rash, swelling, difficulty breathing), chest pain, palpitations, or signs of dehydration

Deficiency is more common than excess vitamin B12, but both are worrisome
Theoretical and route-specific risks FDA's 2024 review specifically flagged that no published human exposure data exists for the subcutaneous, transdermal, or intranasal routes that compounding pharmacies have offered
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