Can HGH cause insulin resistance, and does adding insulin fix the problem?
A lower glucose reading does not prove normal insulin sensitivity.
Increasing GH-axis activity can worsen glucose tolerance in susceptible people. Tesamorelin’s label, for example, calls for glucose assessment and warns about glucose intolerance or diabetes. This does not mean every GH-related treatment produces the same change, but it is a reason to evaluate metabolic outcomes rather than only chasing IGF-1.[1]
Exogenous insulin can lower blood glucose without removing the process that made more insulin necessary. It is therefore not proof that insulin sensitivity has been restored. Insulin is a powerful glucose-lowering medicine, and serious hypoglycemia can occur when its action does not match physiological needs.[2]
The appropriate question is why glucose regulation changed and whether the GH exposure remains justified. Adding more drugs to preserve an exposure has its own consequences. Monitoring and clinical assessment are more informative than a bodybuilding ratio or the assumption that a normal fasting glucose makes an insulin-containing regimen safe.[1][2]
Sources & further reading
- DailyMed: tesamorelin, IGF-1 and glucose precautions
- Humalog prescribing information: hypoglycemia and insulin action
Updated September 24, 2026 · Evidence summaries for understanding research.
Q&A episodes behind this question
This question draws on the following public Q&A topics. The answer above is independently researched and does not quote or represent either creator’s advice.
- Vigorous Steve: Prevent Insulin Resistance On High-Dose GH, Mirabegron Vs. Clen Vs. Ephedrine, Follistatin HypeEpisode title and published description
- Big Paul: Masteron Lowers Side-Effects From Deca? Using GLPs For Bulking? Training, Diet & PEDs For Older GuysEpisode title and published description