Monograph: Blessed Thistle - Oral

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Date: 2018-10-30

NHPID name

Cnicus benedictus ( Germplasm Resources Information Network Taxonomy )

Proper name(s)

Cnicus benedictus ( USDA 2008 )

Common name(s)

Source material

Herb top ( Williamson 2003 , Bradley 1992 )

Route Of administration


Dosage form(s)

Those suited to the allowable route(s) of administration. This monograph is not intended to include food-like dosage forms such as bars, chewing gums or beverages.

Use(s) or purpose(s)

Statement(s) to the effect of:




1 Day per day

See Appendix 1 for examples of appropriate dosage preparations and frequencies of use, according to cited references. The purpose of Appendix 1 is to provide guidance to industry.

Duration of use

No statement is required

Risk information

Statement(s) to the effect of:

Caution(s) and Warning(s): Contraindication(s): Do not use this product if you are pregnant. Known Adverse Reaction(s): Stop use if hypersensitivity/allergy occurs.

Non-medicinal ingredients

Must be chosen from the current Natural health products ingredients database and must meet the limitations outlined in the database.


References cited

References reviewed

Appendix 1: Examples of appropriate dosage preparations, frequencies of use and directions for use


Dried aerial parts:


1.5 - 2 g dried aerial parts, 3 times per day (Blumenthal et al. 2000; Bradley 1992)

Directions for use:

Pour 150 ml of boiling water on dried aerial parts and infuse (Blumenthal et al. 2000)

Fluid extract:

1.5 - 2 g dried equivalent, 3 times per day (1:1, 25% ethanol, 1.5 - 2 ml) (Blumenthal et al. 2000; Bradley 1992)