Roos-Araujo, D., Stuart, S., Lea, R
Theyre especially beneficial for individuals with low vitamin D levels, poor GI absorption, or those on therapies that impact nutrient status
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
The most informative approach usually begins with established risk markers such as a Lipid Panel Test, Cardio IQ Apolipoprotein B Test, Lipoprotein(a) Test, hs-CRP Test, Hemoglobin A1c Test, and kidney-function testing
