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GLP-1 receptor agonists (semaglutide, liraglutide) are not contraindicated with levothyroxine but may affect gastric emptying and medication absorption

That specificity is what makes them therapeutically valuable: each peptide carries a particular biological message, telling specific cells or systems in the body to act

Reconstitute slowly using appropriate solvent

It's also necessary for cellular metabolism and the metabolism of amino acids and fatty acids

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Certain groups face elevated risk of B12 deficiency and should discuss testing with their healthcare provider: Individuals following vegan or strict vegetarian diets without adequate supplementation Older adults (particularly those over 60 years), due to reduced gastric acid production People with gastrointestinal conditions including Crohn's disease, coeliac disease, or those who have undergone gastric or ileal surgery Long-term users of medications affecting B12 absorption, such as metformin (MHRA advises monitoring B12 levels), PPIs, or H2-receptor antagonists Individuals with pernicious anaemia or family history of this autoimmune condition People with exposure to nitrous oxide (recreational or occupational), which can cause functional B12 deficiency Diagnostic testing typically involves serum B12 measurement , though this may not always reflect tissue stores accurately