Direct answer: Blood tests may identify metabolic, kidney, electrolyte, liver, or pancreatic-enzyme changes, but they cannot rule out every GLP-1 complication
Among these latter, non-alcoholic fatty liver disease (NAFLD), characterized by lipid accumulation in hepatocytes, in the absence of alcohol abuse or other steatogenic factors, is one of the most prevalent
You should also look into underlying GI conditions and drug interactions (such as steroids or laxatives) that could impair absorption
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10.3390/biom14050593 167 HanrahanJ.SteevesK
Here is an NPR story I was part of a few months back on this same topic