Clinical Effectiveness of a Combination of Black Elder Berries, Violet Herb, and Calendula Flowers in Chronic Obstructive Pulmonary Disease: The Results of a Double-Blinded Placebo-Controlled Study.

Biology (Basel) · 2020 · PMC7235828 · PMID 32331341

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did not reach statistical significanceno p-value reported

A tendency to reduce the plasma level of TNF-α in patients with reactive arthritis was observed, but the results did not reach statistical significance due to a small sample size and short period of follow-up [ 9 ].

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