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NCT Number: NCT07641088

Zishen Yutai Pill for Patients With Recurrent Implantation Failure

The goal of this clinical trial is to evaluate the efficacy of Zishen Yutai Pill (ZYP) on pregnancy outcomes following embryo transfer and its safety in patients with recurrent implantation failure. The main question it aims to answer is whether ZYP can improve live birth rate in participant's frozen embryo transfer (FET) cycles.

Researchers will compare ZYP to a placebo (a look-alike substance with similar characteristics to ZYP) to see if it works to improve pregnancy outcomes.

Participants will:

1. Start to receive ZYP or placebo (5g per time, 3 times daily) within the first 5 days of their initial menstrual cycle, and will undergo FET in the following cycle. The medication will be taken without interruption till the day of pregnancy test (2 weeks after embryo transfer). Patients with positive results in β-HCG test will continue to take the drug until clinical pregnancy confirmation by ultrasound three weeks later. For those with a negative β-HCG result, the intervention will be stopped. 2. Baseline visit will be conducted on days 2-4 of the participant's first menstrual cycle. Subsequent clinic visits will follow the standard protocol for FET cycle, as outlined below:

Visit 1 (days 2-4 of the second menstrual cycle); Visit 2 (day of ovulation or day of endometrial transformation); Visit 3 (day of embryo transfer); Visit 4 (2 weeks after embryo transfer); Visit 5 (5 weeks after embryo transfer). Follow-up is scheduled at 10 weeks after embryo transfer (Visit 6) and after delivery (Visit 7), and these can be conducted remotely.

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Key information

Conditions

Recurrent Implantation Failure

Age range

20 year–43 year

Sex eligibility

Female

Study type

Interventional

Phase

Not applicable

Primary location

The First Affiliated Hospital of University of Science and Technology of China, Hefei, Anhui, China

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Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Meet the diagnostic criteria for recurrent implantation failure;
  • Aged between 20-40 years old (inclusive) when oocytes were retrieved, and <43 at enrollment;
  • Have at least 1 good-quality embryo for transfer;
  • Intend to undergo frozen-thawed embryo transfer;
  • Voluntary participation and signed informed consent.

Exclusion criteria

  • Concomitant unresolved intrauterine lesions (e.g., intrauterine adhesions grade III-IV, endometrial polyps ≥1 cm, acute endometritis), endometriosis (ASRM stage ≥III), or adenomyosis (uterine volume ≥8 weeks of gestation) that affect embryo implantation;
  • Intend to undergo FET after preimplantation genetic testing (PGT), including aneuploidy screening (PGT-A), monogenic disease testing (PGT-M), chromosomal structural rearrangement testing (PGT-SR);
  • Thin endometrium (<7 mm) before enrollment;
  • Concomitant severe genital malformations or genital neoplasms;
  • Contraindications to estrogen and progestogen (e.g., history of breast cancer);
  • Presence of medical contraindications to assisted reproductive technology, including that either partner has a severe psychiatric disorder, acute genitourinary tract infection, sexually transmitted disease, serious deleterious habit (e.g., drug abuse), or teratogenic exposure to radiation, toxic agent or medication that still under effect; or genetic diseases specified in the Law of the People's Republic of China on Maternal and Infant Health Care for which childbearing and PGT are contraindicated; or severe somatic diseases incompatible with pregnancy; or chromosomal abnormalities;
  • Aspartate aminotransferase (AST) or alanine aminotransferase (ALT) >1.5 × the upper limit of normal (ULN), or serum creatinine (Scr) > ULN;
  • Presence of poorly controlled severe systemic diseases, including cardiovascular, digestive, endocrine, and autoimmune diseases (e.g., antiphospholipid syndrome, Sjögren's syndrome, systemic lupus erythematosus, rheumatoid arthritis);
  • Use of traditional Chinese medicines with similar functions and indications to ZYP within 1 month before screening that may affect treatment efficacy. Chinese patent medicines such as Tiaojing Cuyun Pills, Kuntai Capsules, Peikun Pills, Qilin Pills, Jinfeng Pills, Gushen Antai Pills, and Chinese herbal decoctions containing Cuscutae Semen, Dipsaci Radix, Taxilli Herba, and Asini Corii Colla with kidney-tonifying and spleen-strengthening effects;
  • Allergy to any component of the study drugs;
  • Participated in another interventional trials within 1 month prior to enrollment;
  • Deemed unsuitable for this study by the investigator.

Treatment and study plan

Zishen Yutai Pill

Drug

Eligible participants start to receive ZYP within the first 5 days of their initial menstrual cycle, and will undergo frozen-thawed embryo transfer (FET) in the following cycle. The medication will be taken without interruption till the day of pregnancy test (two weeks after embryo transfer). Patients with positive results in β-HCG test will continue to take the drug until clinical pregnancy confirmation by ultrasound three weeks later. For those with negative β-HCG results, the intervention will be stopped.

Placebo

Drug

Eligible participants start to receive placebo within the first 5 days of their initial menstrual cycle, and will undergo frozen-thawed embryo transfer (FET) in the following cycle. The medication will be taken without interruption till the day of pregnancy test (two weeks after embryo transfer). Patients with positive results in β-HCG test will continue to take the drug until clinical pregnancy confirmation by ultrasound three weeks later. For those with negative β-HCG results, the intervention will be stopped.

Primary outcomes

  1. Live birth rate

    Time frame: About 40 weeks after embryo transfer, up to a maximum duration of 52 weeks after enrollment.

    Live birth is defined as delivery of any viable infants after 28 weeks of gestation.

Secondary outcomes

  1. Endometrial thickness (ovulation day/endometrial transformation day)

    Time frame: On the day of ovulation (natural cycle) or on the day of endometrial transformation (HRT cycle), about 6 weeks after enrollment.

    Natural cycle and hormone replacement therapy (HRT) cycle are two endometrial preparation methods before frozen embryo transfer.

  2. Endometrial pattern (ovulation day/endometrial transformation day)

    Time frame: On the day of ovulation (natural cycle) or on the day of endometrial transformation (HRT cycle), about 6 weeks after enrollment.

    Natural cycle and hormone replacement therapy (HRT) cycle are two endometrial preparation methods before frozen embryo transfer.

  3. Endometrial thickness (embryo transfer day)

    Time frame: On the day of embryo transfer, about 6-7 weeks after enrollment.

  4. Endometrial pattern (embryo transfer day)

    Time frame: On the day of embryo transfer, about 6-7 weeks after enrollment.

  5. β-HCG positive rate

    Time frame: At 2 weeks after embryo transfer, about 8 weeks after enrollment.

    Serum β-HCG level ≥ 20 IU/L at 2 weeks after embryo transfer is defined as positive.

  6. Implantation rate

    Time frame: At 5 weeks after embryo transfer, about 11 weeks after enrollment.

    Implantation rate is defined as the number of gestational sacs per the number of embryos transferred.

  7. Clinical pregnancy rate

    Time frame: At 5 weeks after embryo transfer, about 11 weeks after enrollment.

    Clinical pregnancy is defined as the presence of intrauterine gestation sac under transvaginal ultrasonography.

  8. Ongoing pregnancy rate

    Time frame: About 40 weeks after embryo transfer, up to a maximum duration of 52 weeks after enrollment.

    Ongoing pregnancy is defined as pregnancy with live fetus beyond 10 weeks after embryo transfer (approximately 12 weeks of gestation).

  9. Biochemical pregnancy loss rate

    Time frame: At 5 weeks after embryo transfer, about 11 weeks after enrollment.

    Biochemical pregnancy loss is defined as a positive serum β-HCG test with no evidence of a gestational sac on subsequent ultrasound.

  10. Clinical pregnancy loss rate

    Time frame: About 40 weeks after embryo transfer, up to a maximum duration of 52 weeks after enrollment.

    Clinical pregnancy loss is defined as the failure of a confirmed clinical pregnancy to progress to live birth.

  11. Gestational age at delivery

    Time frame: About 40 weeks after embryo transfer, up to a maximum duration of 52 weeks after enrollment.

  12. Birthweight

    Time frame: About 40 weeks after embryo transfer, up to a maximum duration of 52 weeks after enrollment.

  13. Rate of adverse events

    Time frame: About 40 weeks after embryo transfer, up to a maximum duration of 52 weeks after enrollment.

Study contacts

Contact information is provided by the study sponsor or research team.

Rong Li

CONTACT

[email protected]

+86 13701085402

Xiaoyu Long

CONTACT

[email protected]

+86-010-82264816

Sponsors and collaborators

Lead sponsor

Peking University Third Hospital

Other

Registry information

Official study title

Zishen Yutai Pill for Patients With Recurrent Implantation Failure: a Randomized, Double-blind, Parallel-group, Placebo-controlled Trial

Important dates

Study start
2026
Primary completion
2029
Study completion
2029
First posted
Jun 11, 2026
Registry last updated
Jun 11, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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