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

_Evidence Level: Moderate · Hua F et al., Ageing research reviews, DOI 10.1016/j.arr.2026.103300_

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

- **Evidence Level**: Moderate
- **Why this grade**: Narrative review of thymic regeneration strategies drawing on human and animal studies, yet it pools no data and much of the underlying evidence is early or preclinical.
- **Facts**: Design: Review · Funding: The authors report no conflicts of interest.
- **Publication Types**: Journal Article, Review
- **Journal**: Ageing research reviews
- **Sample Size**: N/A (review)
- **Authors**: Hua F, Zhang Y, Zhao G
- **Graded and published**: 2026-08-13
- **Last edited**: 2026-09-17
- **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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_Canonical: https://longevity-germany.com/en/research/your-thymus-shrinks-from-puberty-on-scientists-want-to-grow-it-back · Part of Longevity Cities · Updated 2026-09-17_