Semaglutide Side Effects and Safety
Reported Semaglutide side effects, contraindications, and safety signals.
Safety & Contraindications
Semaglutide is a research compound and is not FDA-approved for general use. It should be avoided by anyone with personal/family history of medullary thyroid carcinoma, MEN 2, pancreatitis, and pregnancy. Most reported effects are mild and dose-dependent, so start at the low end of the dosing range and titrate up slowly rather than chasing a maximal dose. Injection-site redness, itching, or a temporary lump are the most common local reactions; rotate sites and use clean technique to keep them minimal.
What to Monitor
Track body weight, waist circumference, HbA1c, fasting glucose, fasting insulin, and triglycerides while you're running Semaglutide so you can catch any drift early and adjust before it becomes a problem. Add these to your REGEN biomarker dashboard and re-check on your normal cadence.
Contraindications
- personal/family history of medullary thyroid carcinoma
- MEN 2
- pancreatitis
- pregnancy
References
- Once-Weekly Semaglutide in Adults with Overweight or Obesity · Wilding JPH, et al. · 2021
- FDA Approval Announcement for Wegovy (2021). · 2021
- Semaglutide and Cardiovascular Outcomes in Obesity without Diabetes. · Lincoff AM, Brown-Frandsen K, Colhoun HM et al. · 2023
- Semaglutide, a glucagon like peptide-1 receptor agonist with ... - NIH · Mahapatra MK, Karuppasamy M, Sahoo BM · 2022
- Semaglutide Mechanism of Action Review. PMC. · Ghusn W, De la Rosa A, Sacoto D, Cifuentes L, Campos A, Feris F, Hurtado MD, Acosta A · 2022
- Oral Semaglutide and Cardiovascular Outcomes in High-Risk Type 2 Diabetes. · McGuire DK, Marx N, Mulvagh SL et al. · 2025