Herbal supplements are often available in two major forms, whole herb and standardised.
Whole herbs have a variable level of active components. Potency will vary with growing conditions and time of harvest. Whole herb products are generally the mildest form of a herb, and often have higher amounts recommended for suggested servings.
Standardised herbs have a set percentage of active components that is consistent from batch to batch. Standardised herbs are not only more consistent than whole herbs, but more potent as well because the manufacturer can incorporate a higher percentage of active components during processing than the concentrations found in whole herbs.
Recommended serving sizes are often smaller in terms of weight such as milligrams and in total number of capsules or tablets suggested per day.