Benefits
Knee joint comfort and mobility
In 103 adults with mild to moderate knee osteoarthritis, 300 or 600 mg of ParActin a day for 84 days lowered WOMAC pain scores more than placebo at days 28, 56 and 84, and also improved stiffness, physical function, fatigue and quality-of-life scores. It is a single trial, funded by HP Ingredients, which sells ParActin; the lead author was affiliated with the company.
Joint pain in a second ParActin trial
In 60 adults with active rheumatoid arthritis, ParActin tablets three times a day for 14 weeks did not lower joint pain significantly more than placebo, the main outcome. Tender and swollen joint counts and a disability questionnaire improved within the ParActin group. Chilean public grants funded the trial; Herbal Powers supplied the extract. This does not show that a supplement treats arthritis.
Fatigue scores
In the knee trial, scores on a fatigue scale improved more with ParActin than with placebo; this was a secondary outcome in adults with knee osteoarthritis, in a trial funded by HP Ingredients. A pilot in people with multiple sclerosis taking interferon beta used an andrographis extract that the paper does not name as ParActin, so it is not counted here.
Standardized andrographolide content
ParActin is standardized for andrographolides; the tablets in the earlier trial held an extract with 30% total andrographolides, and the European Medicines Agency summary lists 30 mg andrographolide per tablet. No published head-to-head comparison with a generic andrographis extract was found, so standardization alone does not show better results.
Mechanism of action
NF-κB pathway inhibition (lab)
In lab and animal studies, andrographolide blocked activation of NF-κB, a switch for many inflammatory genes, by binding directly to one of its proteins. No cited ParActin trial showed a matching change in inflammatory markers versus placebo.
Immune markers in a patient trial
In the rheumatoid arthritis trial, rheumatoid factor, IgA and complement C4 fell within the ParActin group. These are disease markers measured in patients, not evidence of an effect in healthy people.
Clinical trials
Randomized, double-blind, placebo-controlled trial; 103 adults with grade I to II knee osteoarthritis; ParActin 300 or 600 mg a day or placebo for 84 days (Hancke et al. 2019, Phytother Res)
103 adults with mild to moderate knee osteoarthritis.
Both doses lowered WOMAC pain scores more than placebo at days 28, 56 and 84, and improved WOMAC stiffness, physical function, fatigue and SF-36 quality-of-life scores. The study was funded by HP Ingredients, the supplier; one author was affiliated with HP Ingredients and another with a contract research organization.
Randomized, double-blind, placebo-controlled trial; 60 adults with active rheumatoid arthritis; ParActin tablets (extract with 30% total andrographolides) three times a day for 14 weeks after a 2-week washout; funded by Chilean public grants (CONICYT/FONDEF, INNOVA CHILE CORFO), extract donated by Herbal Powers, authors declared no disclosures (Burgos et al. 2009, Clin Rheumatol)
60 adults with an active autoimmune inflammatory condition.
Pain intensity on a visual analog scale, the main outcome, fell more with ParActin than placebo, but the difference was not statistically significant. Tenderness and swelling counts, a disability questionnaire and SF-36 scores improved within the ParActin group, and an autoantibody, IgA and C4 fell. The authors call for a larger, longer trial.