Freeze-dried Korean black raspberry powder,
does it really help with Antioxidant activity and reduction of oxidative stress?
research showsSmall human trials of 30 g/day freeze-dried powder for four weeks reported improvements in selected measures such as GPx, CAT, or lipid peroxidation, but findings were inconsistent and entirely biochemical surrogates. Evidence concentrated on a specific powder and its regulatory recognition cannot establish clinical anti-aging efficacy, so the grade is C.
ads claimClaims such as 'removes free radicals,' 'prevents cellular aging,' or 'anticancer antioxidant' expand laboratory-marker changes into longevity or disease prevention. Blood-pressure research on Rubus occidentalis and lipid research on unripe-fruit extract are different species, products, or efficacy axes.
Useful facts when choosing a product
- The individually recognized ingredient in South Korea is a specified freeze-dried powder made from ripe Rubus coreanus fruit and is registered for antioxidant function.
- The key human-trial dose was 30 g/day, which differs in concentration and composition from ordinary juice, concentrate, or extract capsules.
- Rubus occidentalis is a different species, and sugar and polyphenol content can vary among products.
What the research actually shows
The uncontrolled Lee 2011 study in 15 men found higher GPx after 30 g/day for four weeks but no change in lipid peroxidation. The placebo-controlled Park 2015 trial, completed by 39 men, reported improvements in GPx, CAT, and plasma lipid peroxidation but no effect on plasma lipids, LDL oxidation, or DNA damage. In the Suh 2013 smoker trial, the between-group difference in urinary 8-OHdG was not significant and interpretation relied on an exploratory responder analysis.
Why this is classified as C (46)
Controlled human evidence exists, but small samples, four-week surrogate endpoints, conflicting results, and concentration on a specific ingredient result in C with 52 points.
Counterpoint. Some oxidative markers may improve with the standardized 30 g/day powder, but clinical health benefit remains unverified.
Rejudgment record. New verdict — Human trials exist, but four-week oxidative surrogates, conflicting results, and concentration on one individually recognized ingredient limit the grade to C
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 |
|---|---|---|
| Antioxidant activity | C | Some antioxidant-enzyme surrogates such as GPx and CAT improved, but findings were inconsistent. |
| Reduction of oxidative stress | C | Lipid peroxidation, 8-OHdG, and LDL-oxidation findings conflicted, with no clinical outcomes. |
Cross-check — Codex and Claude
Evidence Table
| Study | Design | Sample | Funding | Endpoint | Result | Weight |
|---|---|---|---|---|---|---|
| Lee JE et al. 2011 | Uncontrolled before-and-after human study | 15 | Rural Development Administration | GPx, SOD, total antioxidant capacity, and lipid peroxidation | GPx increased after 30 g/day for four weeks; lipid peroxidation and major metabolic markers did not change. | Supportive |
| Park E et al. 2015 | Randomized, placebo-controlled human trial | 39 | Supported by the Rural Development Administration | GPx, CAT, lipid peroxidation, LDL oxidation, and DNA damage | Some enzymes and plasma lipid peroxidation improved; LDL oxidation and DNA damage were null. | Key |
| Suh HW et al. 2013 | Randomized, placebo-controlled human trial | 38 | Government and agricultural research support | Urinary 8-OHdG and metabolites | The between-group difference in 8-OHdG reduction was not significant; responder analysis was exploratory. | Key |
Receipt — 3 References
All 3 cited sources were verified for existence at the original page (as of 2026-07-17).
Reviewed and approved: Chamgap Editorial Team · Approval date: 2026-07-17 · Corrections: none
Cite this verdict
[Chamgap] Freeze-dried Korean black raspberry powder x antioxidant activity and reduction of oxidative stress — Evidence Grade C·46. 3 cited sources checked. Source: https://chamgap.com/en/verdicts/antioxidant-aging/rubus-coreanus-freeze-dried-antioxidant/ · 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.