Maca,
does it really help with Vitality and male function (sexual desire, erectile function, late-onset hypogonadism symptoms, sperm parameters)?
research showsMaca has positive signals from small human RCTs for sexual desire, mild erectile function, and late-onset hypogonadism symptoms in men. However, samples are small, many endpoints are subjective, and large studies with independent repeated replication are lacking. Sperm parameters, testosterone increase, and exercise vitality are unclear or unsupported, so the broad male-vitality claim is judged as limited C-level evidence.
ads claimIn the Korean market, black maca is described together with male vitality, stamina, energy care, virility, sexual-desire improvement, help for erectile dysfunction, increased sperm motility/sperm count, and late-onset male health. Many combination products mix it with tongkat ali, L-arginine, zinc, saw palmetto, red ginseng, and others, so they must be distinguished from evidence for maca alone.
Useful facts when choosing a product
- According to Food Safety Korea ingredient information, gelatinized maca powder (No. 2011-7, company: Easter BNF) is labeled as “may help improve sperm motility” and, as added in June 2025, “may help late-onset male health,” with a daily intake of gelatinized maca powder 5.0 g/day. Regulatory recognition was treated separately from this verdict’s evidence grade.
- Advertising and product names commonly use broad phrases such as “male vitality,” “stamina,” “energy care,” “vitality supplementation,” and “male function improvement.”
- Press-release-style new-product articles connect black maca gelatinized maca powder with sperm motility, increased sperm count, late-onset male symptoms, and enhanced exercise ability/physical strength.
- Doses in sexual desire/erectile function studies are often 1.2-3.0 g/day, while the Korean LOH RCT and Food Safety Korea ingredient standard are 5.0 g/day. Products differ greatly in raw material, processing, content, and combination ingredients.
- Claims of increasing male hormone/testosterone were repeatedly not supported in key human trials.
What the research actually shows
For maca alone, a 2010 systematic literature review of sexual function found 4 RCTs and reported limited positive signals, but pointed out sample sizes of 8-57, insufficient reporting of allocation concealment/randomization, and lack of independent replication. A 2023 erectile dysfunction meta-analysis reported an IIEF-line score MD of 1.13 (95% CI 0.64-1.61) across 2 RCTs, n=79, but GRADE was low and one study was negative. A Korean LOH-symptom RCT (2023) reported improved AMS and IIEF with n=80, 5 g/day for 12 weeks, but it is a single study and includes company-affiliated authors. A semen-parameter meta-analysis (2022) found unclear results across 5 RCTs, with sperm concentration WMD 2.22 (95% CI -2.94 to 7.37, p=0.4). Testosterone increase was not supported in both the 2002 sexual-desire RCT and the 2023 LOH RCT. Studies of combinations such as maca plus garlic chives were separated from the maca-alone verdict.
Why this is classified as C (46)
C (46 points). There are randomized placebo-controlled human trials and systematic literature reviews for sexual desire, mild erectile function, and late-onset hypogonadism symptoms, so the evidence is not completely absent. However, key positive signals remain in small studies of n=8-80 and in a meta-analysis of 2 RCTs, independent large replication is lacking, and some studies have industry links such as product provision or company-affiliated authors. Sperm parameters were unclear in a 2022 meta-analysis, and testosterone increase and exercise vitality were not supported in key studies. Under methodology 2-b, it is difficult to raise the grade to B or higher.
Counterpoint. Some domestic gelatinized maca powder products can display sperm motility and late-onset male health functionality as individually recognized ingredients, and a 2023 Korean RCT also reported improvement in AMS and IIEF at 5 g/day. Therefore, this is not an issue that can be declared ineffective. However, this signal has weak independent replication and is insufficient to extend to all black maca, combination products, testosterone increase, or exercise-vitality claims.
Rejudgment record. reassessment (downgraded B -> C) — Small RCT signals for sexual desire exist, but independent replication is weak and sperm/testosterone are unclear -> maximum C under 2-b. Consistent with blind C.
Cross-check — Codex and Claude
Evidence Table
| Study | Design | Sample | Funding | Endpoint | Result | Weight |
|---|---|---|---|---|---|---|
| Study 1 | not specified | not reported | menopause | Official ingredient information confirmed labels for sperm motility, late-onset male health, and 5.0 g/day. | core | |
| Study 2 | not specified | not reported | gut | Example of maca being sold in domestic e-commerce as a combination product for male vitality, stamina, and energy care. | core | |
| Study 3 | not specified | not reported | gut/menopause | Press-release-style article linking sperm motility, sperm count, late-onset symptoms, exercise ability, and physical strength enhancement. | core | |
| Shin BC et al. 2010 | systematic review | possible manufacturer/industry involvement | not specified | Reviewed 4 RCTs and reported limited positive signals, but sample and methodological limitations were large, so the conclusion was limited. | core | |
| Gonzales GF et al. 2002 | not specified | 57 | possible manufacturer/industry involvement | not specified | In a 57-man RCT, self-rated sexual desire improved at 8-12 weeks, but testosterone and estradiol did not change. | supporting |
| Stone M et al. 2009 | not specified | 8 | possible manufacturer/industry involvement | not specified | Crossover trial in 8 trained male cyclists; sexual desire was partly positive, but 40 km time was not significant versus placebo. | supporting |
| Lee HW, Lee MS, Kil KJ 2023 | meta-analysis/RCT | mixed/partly industry-related | not specified | In a meta-analysis of 2 RCTs in mild ED, EF MD was 1.13, but certainty of evidence was low. | supporting | |
| Shin D et al. 2023 | double-blind RCT | 80 | mixed/partly industry-related | NAD | In an 80-man Korean RCT of eugonadal LOH symptoms, AMS and IIEF improved, testosterone did not change, and no serious adverse events occurred. | supporting |
| Lee HW et al. 2022 | meta-analysis | mixed/partly industry-related | not specified | Across 5 RCTs, sperm concentration and motility results were mixed, and the sperm concentration meta-analysis was not significant. | supporting | |
| Memorial Sloan Kettering Cancer Center | not specified | not reported | liver/pregnancy | Summarized that human studies are few and mixed, and advised caution in pregnancy, lactation, hormone-sensitive cancer, and interference with testosterone testing. | supporting |
Receipt — 10 References
Every cited source was opened and checked against the live page on 2026-07-07.
Reviewed and approved: Chamgap Editorial Team · Approval date: 2026-07-07 · Corrections: none
Cite this verdict
[Chamgap] Maca x vitality and male function (sexual desire, erectile function, late-onset hypogonadism symptoms, sperm parameters) — Evidence Grade C·46. 10 cited sources checked. Source: https://health-receipt.pages.dev/en/verdicts/mens/maca-vitality/ · CC BY 4.0CC BY 4.0 — free to use with attribution; do not distort grades, numbers, or verdict meaning.
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