This matters especially in patients on multiple oral drugs or with GI conditions
Not getting enough B12 from foods like leafy greens or having an unhealthy gut can also reduce B12 absorption
These in turn are claimed to stimulate production of GLP-1, the gut hormone associated with satiety that Ozempic-like drugs are mimicking

Semaglutide delays gastric emptying by 20-40%, which can: Prolong the time levothyroxine remains in the stomach Alter the pH environment during absorption Change the interaction between levothyroxine and food or other medications Practical Strategies to Minimize Interaction Based on clinical experience and pharmacokinetic principles, the following strategies help maintain stable levothyroxine levels: Take levothyroxine first thing in the morning on an empty stomach this remains the gold standard regardless of semaglutide use Wait at least 30-60 minutes before eating or taking other medications Consider taking levothyroxine at bedtime some patients find this avoids the gastric emptying overlap entirely (research supports comparable absorption with nighttime dosing) Monitor TSH every 6-8 weeks during the initial months of semaglutide therapy Report symptoms promptly fatigue, cold intolerance, constipation, or brain fog may indicate suboptimal thyroid levels When Dose Adjustments Are Needed Thyroid medication adjustments during semaglutide treatment may be necessary in two scenarios: TSH rising (under-replacement): May indicate impaired levothyroxine absorption

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