Cat’s Claw Forte


Cat’s Claw contains oxindole alkaloids, particularly the pentacyclic oxindole alkaloids (POAs) and other compounds. This product is standardized to contain 4.0 mg per tablet of POAs to ensure optimal strength and quality, and is low in the unwanted tetracyclic oxindole alkaloids. Cat’s Claw Forte may:

  • enhance immune system function
  • promote healthy response to environmental stresses
  • promote the body’s normal resistance function
  • support respiratory system health
  • promote vitality Δ
Content Product #
40 Tablets M1182

Suggested Use: 1 tablet 2 – 3 times daily, or as directed.



Amount Per Serving %DV
† Daily Value (DV) not established.
Calories 2
Calcium 45 mg 4%
Cat’s Claw bark 5:1 extract from Uncaria tomentosa bark 2.1 g
Containing pentacyclic oxindole alkaloids 4.0 mg
421 mg

Other Ingredients

Calcium acid phosphate, cellulose, hypromellose, magnesium stearate, maltodextrin, silica and sodium starch glycollate.

Caution: Contraindicated in pregnancy and lactation.

 For other contraindications and cautions specific to this product, please refer to theContraindications and Cautions for MediHerb Botanicals.

Cat’s Claw Quality

Cat’s Claw (Uncaria tomentosa) is an herb traditionally used by the Asháninka Indians of Peru. The tribe recognized two different types of this plant (one was used therapeutically, the other was never used). This difference has been verified phytochemically and two chemotypes have been identified: the preferred chemotype contains only pentacyclic oxindole alkaloids (POAs) speciophylline, mitraphylline, pteropodine, isomitraphylline and isopteropodine; the other chemotype, which was never used, contains the tetracyclic oxindole alkaloids (TOAs) rhynchophylline and isorhynchophylline in addition to the POAs. The preference for the POA chemotype of Cat’s Claw has been validated by scientific research. MediHerb tests each batch of Cat’s Claw to determine that only the preferred chemotype is used to manufacture our Cat’s Claw products. The upper trace of herb, labeled A, shown below was rejected by our quality assurance testing as it contained the TOAs. The bottom trace of herb, labeled B, contains very low levels of TOA and was accepted.