Table 1.

Inclusion/exclusion criteria of the studied papers.

Criterion	Inclusion	Exclusion
Study Design	All relevant in vitro studies and animal studies	Reviews, clinical trials, case reports, editorials, letters, unpublished work, study protocols
Intervention *	Natural products or isolated compounds thereof	Common medication, acupuncture, massage, relaxation, and mind–body exercises
Comparator *	Nonsteroidal anti-inflammatory drugs (NSAIDs), Steroids (corticosteroid medications, such as prednisone), Disease-modifying antirheumatic drugs (DMARDs), Biologic agents	Acupuncture, massage, relaxation, and mind-body exercises alone or along with a natural product intervention
Outcomes *	Reduction in inflammation, pain and/or swelling relief	Any other outcomes that cannot support anti-inflammatory activity and/or pain and swelling relief
Language	English	Non-English full text available
Time Frame	2015 onwards	Earlier than 2015

* Applicable in animal models only.