Big effect
L-Carnitine linked to a marked rise in chemical pregnancy rates among women with PCOS — but the evidence rests on just 46 patients across 8 small trials.
This is an early, intriguing signal that L-carnitine may help with fertility in PCOS, but the tiny sample size and lack of blinding mean the finding is far from settled — and chemical pregnancy is an early milestone, not a guarantee of a live birth.
A meta-analysis of 8 randomized trials found that women with PCOS who took L-carnitine had significantly higher rates of chemical pregnancy (early detection via hormone test) and clinical pregnancy (confirmed by ultrasound), along with improvements in ovulation, progesterone, and endometrial thickness. However, the total number of participants across all studies was only 46, and the trials were not blinded, so these results should be viewed as preliminary rather than conclusive.
Where this fits in the evidence
This is among the first studies we've indexed on L-Carnitine for Increased Chemical Pregnancy Rate — treat it as an early signal until more research accumulates.
The study
- Meta-Analysis
- n = 46
- 2025-07-15
- Obstetrics & gynecology science
- PubMed: 40436023
- DOI: 10.5468/ogs.24272
- Full study breakdown →
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