The randomised crossover study compared two blends with different proportions of grape marc and grape-seed extract. Blood pressure, lipids and postprandial response were measured to distinguish formulation effects.

The extract-rich blend was associated with lower systolic blood pressure but also lower HDL, while the marc-rich blend reduced postprandial triglycerides. The response therefore does not support one simple interpretation.

For formulation teams, matrix specificity is the useful result: component ratio, dose and composition must accompany any conclusion. Multiple endpoints also call for replication and a clearly defined primary outcome.

Why it matters

Raw material, component ratio and phenolic profile are part of the intervention and cannot be compressed into the generic label “grape polyphenols”.

Evidence limit

A short trial with multiple endpoints; effects are not uniform and do not establish an overall cardiometabolic benefit for the category.

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