Cistanche tubulosa extract,
does it really help with Improvement of testosterone and sexual function?
research showsNo trial has tested Cistanche tubulosa extract alone for testosterone or sexual function in humans. The human evidence used a Cistanche-ginkgo combination that cannot isolate Cistanche, while standalone trials for other uses did not assess sexual-function outcomes. No direct standalone evidence exists, resulting in a question-mark grade.
ads claimAdvertisements describe it as a testosterone booster and as support for male vitality, libido, and erectile function, but the identified direct human efficacy evidence does not substantiate that scope.
Useful facts when choosing a product
- Doses and extraction conditions used in animal studies do not directly correspond to human products.
- Results from a Cistanche-ginkgo combination cannot isolate an effect of Cistanche alone.
- Marketed extracts may differ in echinacoside and acteoside content and extraction solvent.
- Short-term human trials exist, but they did not directly measure efficacy for testosterone or sexual function.
Chamgap Semantic Classification Code
Candidate index · review held
S.cistanche-tubulosa-extract.UNK.testosterone-and-sexual-function.improve.placeboSupplements and nutraceuticals > Cistanche tubulosa extract > Unknown > testosterone and sexual function > Improvement claim > Placebo
An automated migration candidate, not an issued permanent code; exact claim scope remains under review. This machine-generated migration candidate helps retrieval but is not a permanent assignment. The original verdict ID and URL remain authoritative.
What the research actually shows
Wang 2016 reported that an ethanolic Cistanche tubulosa extract increased testosterone and sperm measures in male rats. The 190-person Kan 2021 RCT administered Cistanche together with ginkgo and assessed fatigue, quality of life, and a sexual-life questionnaire, so the effect of Cistanche alone cannot be separated. The 26-person Inada 2021 RCT assessed walking ability; testosterone and sexual function were not endpoints.
Why this is classified as ?
Because there is no ingredient-only human efficacy trial, the appropriate rating is ?, meaning no human efficacy literature, rather than D, which would imply only preclinical evidence or human ineffectiveness. Both subclaims receive the same rating.
Counterpoint. Preclinical reproductive findings and the combination-product sexual-life signal may support a hypothesis for future ingredient-only trials, but they do not change the current judgment.
Rejudgment record. Reassessment (cross-check reflected) — No ingredient-only human efficacy trial identified that directly assessed testosterone or sexual function
Cross-check — AI research and Codex final gate
Evidence Table
| Study | Design | Sample | Funding | Endpoint | Result | Weight |
|---|---|---|---|---|---|---|
| Wang T et al. 2016 | Preclinical study in male rats | Non-U.S. government research support from China | Serum testosterone, sperm count and motility, and liver histology | Testosterone and sperm measures increased at selected doses, while mild hepatic edema was observed at the high dose. | Preclinical, indirect | |
| Kan J et al. 2021 | Randomized double-blind placebo-controlled combination-product trial | 190 | Industry-linked, with authors from Nutrilite | Fatigue, quality of life, sexual-life quality questionnaire, and lactate | Questionnaire improvements were reported with a Cistanche-ginkgo combination, but the ingredient-only effect was not isolated. | Combination, indirect |
| Inada Y et al. 2021 | Randomized double-blind placebo-controlled trial | 26 | Japan Society for the Promotion of Science | Gait speed, two-step test, muscle mass, and safety | Selected walking measures improved, but testosterone and sexual function were not measured. | Outside the efficacy claim, supportive for safety |
Receipt — 3 References
All 3 cited sources were verified for existence at the original page (as of 2026-07-11).
Final verification and publication gate: Codex · Evidence date: 2026-07-11 · Corrections: none
Cite this verdict
[Chamgap] Cistanche tubulosa extract x improvement of testosterone and sexual function — Evidence Grade ?. 3 cited sources checked. Source: https://chamgap.com/en/verdicts/mens/cistanche-tubulosa-testosterone-sexual-function/ · CC BY 4.0CC BY 4.0 — free to use with attribution; do not distort grades, numbers, or verdict meaning.
What this document does and does not do
Chamgap is an information source. It reports what research has and has not confirmed; it does not tell readers what to take or buy. That decision belongs to readers and, when needed, medical or legal professionals. This verdict reflects literature available up to the search date and may change as new research appears. Nothing here is medical advice.