What is the extraction ratio of standard kidney bean extract?

An extraction ratio of X:1 means that X kilograms of raw plant material are processed and concentrated into 1 kilogram of finished extract. For example, a 10:1 Kidney Bean Extract is produced from 10 kg of dried white kidney bean seed, concentrated down to 1 kg of powder. The higher the first number, the more raw material has been concentrated into each kilogram of extract, which generally means a more concentrated product with a smaller recommended dosage.

In the plant extract industry, Kidney Bean Extract is most commonly supplied in the following ratios:

The 10:1 and 20:1 grades are the most common choices for weight management and carb-blocking supplements. Lower ratios such as 4:1 or 8:1 stay closer to the natural composition of the bean and are often selected when a manufacturer wants a milder ingredient or a more economical cost per kilogram.

This is the most common point of confusion among buyers. The extraction ratio describes how much raw material went into the extract, but it does not directly tell you how much of the active compound is present. For Kidney Bean Extract, the active compound is phaseolamin, an alpha-amylase inhibitor that blocks the breakdown of dietary starch. Its content is measured separately, usually as a percentage (1%, 2%, 5%, or 8%) or as enzyme activity in amylase units per gram (AU/g, typically in the range of 1,000 to 15,000 AU/g).

Two extracts with the same 10:1 ratio can still differ in phaseolamin content if they are made from different raw materials or processed differently. That is why you should always check the certificate of analysis for both the extraction ratio and the active compound specification, and confirm the test method (HPLC is the industry standard for this product).

When you compare quotes from different suppliers, the extraction ratio is one of the key parameters that determines price and dosage. A 20:1 extract will cost more per kilogram than a 4:1 extract, but you typically need less of it per serving. Comparing products on the same ratio and the same active compound specification is the only reliable way to evaluate price and quality. A trustworthy supplier will provide a certificate of analysis covering the ratio, phaseolamin content, alpha-amylase inhibitor activity, and test method, and will manufacture under GMP conditions to ensure batch-to-batch consistency.

Greenskybio (Hangzhou Green Sky Biotechnology) is a plant extract manufacturer with more than 20 years of industry experience. The company operates GAP-certified organic planting bases and advanced extraction facilities, and it supplies Kidney Bean Extract with clearly documented specifications. As a plant extract supplier, it also supports buyers with certificates of origin, commodity inspection, and compliance documentation, which simplifies the import process for overseas customers.

There is no single "standard" extraction ratio for Kidney Bean Extract. Ratios of 4:1, 8:1, 10:1, and 20:1 are all standard options, and the right one depends on your application, dosage, and budget. What matters most is understanding the difference between extraction ratio and active compound content, and working with a supplier who can document both clearly.