Surprising
A 24-week trial linked daily jiaogulan tea to a threefold increase in hair elasticity — but left glossiness unchanged.
This is the first controlled trial to suggest jiaogulan can improve hair structure, but the finding is still preliminary — the effect on shine was absent, and the study stands alone without replication.
Researchers gave healthy adults 340 mL of jiaogulan extract daily for 24 weeks and found that hair elasticity and density tripled, and hair diameter quadrupled, compared to placebo. However, the supplement did not improve hair glossiness, and this is one of the first studies on the topic, so the results need confirmation before drawing firm conclusions.
Where this fits in the evidence
This is among the first studies we've indexed on jiaogulan for Increased Hair Elasticity — treat it as an early signal until more research accumulates.
The study
- Randomized Controlled Trial (RCT)
- 2025-02-21
- Nutrients
- PubMed: 40077637
- DOI: 10.3390/nu17050767
- Full study breakdown →
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