That depends on a number of factors specific to your experiences taking GLP-1 medications
To get a FULL LIST OF THE BEST FOOD TO EAT ON GLP-1 (Have a look at our TOP 60 Foods To Eat On GLP-1) For deeper guidance on protein targets, see: How Much Protein on GLP-1 | GLP-1 Protein Calculator | Prevent Muscle Loss on GLP-1 Fiber-Rich Foods That Support Digestion Constipation is one of the most consistent complaints among GLP-1 users

You should contact your GP if: You have been found to have elevated B12 levels on blood tests, particularly if levels exceed 1000 ng/L (approximately 740 pmol/L, though laboratory reference ranges vary) and you are not taking high-dose supplements You develop new symptoms after starting B12 supplementation, including persistent skin rashes, significant gastrointestinal disturbance, or unexplained symptoms You have underlying liver disease, kidney problems, or blood disorders and are considering B12 supplementation You are taking B12 supplements without medical supervision and have not had your levels checked, particularly if taking doses exceeding 2000 micrograms daily You experience symptoms that might indicate underlying disease, such as unexplained weight loss, persistent fatigue, jaundice, or abdominal swelling Call 999 or go to A&E if you develop severe allergic reactions following B12 injections, including difficulty breathing, facial swelling, or widespread rash, as these may indicate anaphylaxis, though this is extremely rare

L-theanine is sometimes promoted for focus and cognitive performance
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This isn't a marginal supplement category or an emerging fringe treatment - it's a class of prescription medications with a robust clinical trial data package that informed medical consensus supports for weight management in qualifying patients