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

*Thymus Regeneration in Countering Immunosenescence: Mechanisms, Strategies and Future Perspectives.*

- **Evidence Level**: Moderate
- **Publication Types**: Journal Article, Review
- **Journal**: Ageing research reviews
- **Sample Size**: N/A (review)
- **Authors**: Hua F, Zhang Y, Zhao G
- **Published**: 2026-08-13
- **Topics**: immune aging, thymus, inflammaging
- **DOI**: https://doi.org/10.1016/j.arr.2026.103300
- **Original Source**: https://pubmed.ncbi.nlm.nih.gov/42595186/

## Summary

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.

## Practical Takeaway

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

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