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Journal ArticleReviewAgeing research reviews·Aug 2026

Your Thymus Shrinks From Puberty On. Scientists Want to Grow It Back

Key Insight

This review suggests thymus regeneration remains experimental, so treat any clinic offering it with caution.


The thymus is the small gland that trains your T cells, and it starts shrinking in your teens. That shrinkage is one big reason older immune systems struggle with new infections and vaccines, and it feeds the low-grade inflammation known as inflammaging. This review walks through the approaches being tested to regrow it, including growth hormone and IGF-1 signaling, mTOR inhibitors like rapamycin, sex hormone blocking, and stem cell therapies. All of it is still early, mostly in animals and small trials, with no ready-to-use option.

Conflict of Interest Disclosure: The authors report no conflicts of interest.

Disclaimer: Research summaries are provided for informational purposes only and do not constitute medical advice. Always consult a qualified healthcare professional before making changes to your health routine.