Rice bran ethanolic extract,
does it really help with Improved sleep duration, sleep efficiency, and sleep onset?
research showsThe trial enrolled 50 adults with sleep disturbance but analyzed 42, with 21 per group. After 1,000 mg/day for two weeks, polysomnographic total sleep time, efficiency, and latency improved, but between-group PSQI was null and the evidence came from one S&D-supplied lot with company coauthors, resulting in C.
ads claimMarketing may expand the finding into immediate sleep, guaranteed deep sleep, or replacement of hypnotic medication. Direct evidence is a two-week adjunctive trial in adults with disturbed sleep that excluded severe insomnia; it does not establish treatment of chronic insomnia or long-term benefit.
Useful facts when choosing a product
- The studied material was a water-ethanol rice bran extract powder standardized to 4.5 mg/g of gamma-oryzanol.
- The trial dose and the Korean functional-ingredient daily intake are 1 g/day of rice bran ethanolic extract.
- Korean products include one-sachet formulations delivering 1 g and products sold by companies including Amway.
- The study powder contained sodium caseinate, so milk allergy and the actual product label should be checked.
What the research actually shows
Um and colleagues in 2019 randomized 50 adults with sleep disturbance but analyzed 42, with 21 per group. After rice bran extract at 1,000 mg/day for two weeks, polysomnographic total sleep time at p=0.019 and sleep efficiency at p=0.010 were positive, while sleep latency at p=0.047 was marginal. Between-group PSQI, Epworth Sleepiness Scale, and fatigue outcomes were null. The ingredient was one S&D-supplied lot standardized to 4.5 mg/g of gamma-oryzanol, company researchers were coauthors, and no independent replication exists.
Why this is classified as C (50)
Polysomnographic total sleep time, efficiency, and latency were positive, but only 42 participants were analyzed, 21 per group, for two weeks; latency at p=0.047 was marginal and between-group PSQI was null. One S&D-supplied lot, company coauthors, and no independent replication support C with 50 points.
Counterpoint. Short-term objective sleep improvement is confirmed for the exact standardized ingredient at 1 g/day.
Rejudgment record. Reassessment (cross-check reflected) — A two-week RCT enrolled 50 and analyzed 42 participants; polysomnographic total sleep time and efficiency were positive and latency was marginal at p=0.047, but PSQI was null and the study used one S&D-supplied lot with company coauthors and no independent replication
Sub-claim grades by effect
This ingredient is marketed for several effects. A single overall grade blends strong and weak claims together, so each effect is graded separately here. The overall grade reflects the strongest disconfirming or core claim.
| Effect (sub-claim) | Grade | Basis |
|---|---|---|
| Increased total sleep time | C | A two-week polysomnography trial enrolled 50 and analyzed 42 participants and found an increase versus placebo, but independent replication is absent. |
| Improved sleep efficiency | C | The same single trial was positive, limited to one standardized ingredient. |
| Reduced sleep latency | C | Polysomnographic sleep latency was marginally significant in one two-week trial. |
Cross-check — Codex and Claude
Evidence Table
| Study | Design | Sample | Funding | Endpoint | Result | Weight |
|---|---|---|---|---|---|---|
| Um MY et al. 2019 | Randomized double-blind placebo-controlled polysomnographic trial | 2 | Ingredient supplied by S&D with company researchers as coauthors | Polysomnographic sleep latency, total sleep time, sleep efficiency, and stages; PSQI, sleepiness, and fatigue | Polysomnographic total sleep time (p=0.019) and efficiency (p=0.010) were positive and latency at p=0.047 was marginal, while between-group PSQI was null. | Key, single product |
Receipt — 1 References
All 1 cited sources were verified for existence at the original page (as of 2026-07-15).
Reviewed and approved: Chamgap Editorial Team · Approval date: 2026-07-15 · Corrections: none
Cite this verdict
[Chamgap] Rice bran ethanolic extract × Improved sleep duration, sleep efficiency, and sleep onset — Evidence Grade C·50. 1 cited sources checked. Source: https://health-receipt.pages.dev/en/verdicts/sleep/rice-bran-ethanolic-extract/ · 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.