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| Form | Bioavailability | Best For |
|---|---|---|
| WS 1442 (Standardized Extract) | High | Most studied — standardized to 18.75% OPCs; used in nearly all major clinical trials |
| LI 132 (Standardized Extract) | High | Alternative clinical-grade extract — standardized to 2.2% flavonoids, well-studied in heart failure |
| Berry/Leaf Powder Capsules | Low-Moderate | Traditional use — whole plant material, less potent than standardized extracts |
Bioavailability: High. Best for: Most studied — standardized to 18.75% OPCs; used in nearly all major clinical trials.
Bioavailability: High. Best for: Alternative clinical-grade extract — standardized to 2.2% flavonoids, well-studied in heart failure.
Bioavailability: Low-Moderate. Best for: Traditional use — whole plant material, less potent than standardized extracts.