23/08/2024
A randomized, double-blind, placebo-controlled study to evaluate the benefits of a standardized Nigella sativa oil containing 5% thymoquinone in reducing the symptoms of seasonal allergy
PMID: 39121267
Study link: https://pubmed.ncbi.nlm.nih.gov/39121267/
Allergic rhinitis (AR) is a common condition caused by inflammation of the nasal passages in response to an allergen. Between 10% to 30% of the global population is affected by AR. Previous evidence has supported the use of black seed oil for treating AR, but the problem is that the extracts were not standardized. Herbal products can vary in the amounts of active ingredients depending on how they are harvested (flower, plant, root) and processed. This study standardized N. sative oil (NSO) to 5% thymoquinone (TQ) (thought to be the main bioactive compound in NSO) and compared it to a placebo in individuals with seasonal AR.
Patients were given 250 mg of NSO with bioperine or placebo twice daily for 15 days. The NSO group experienced improvements in the severity of AR symptoms on TNSS and TOSS screening surveys (sneezing, itching, runny nose, watery eyes, puffy eyes). Improvements were seen as early as five days. At 15 days, the NSO reported the following level of severity for their symptoms - 48.4% moderate, 33.3% mild, 9.9% very mild, and 6.1% no symptoms compared to 34.4% moderate and 65.8% severe symptoms in the placebo group. The mean duration of symptoms decreased from 77.7 minutes to 37.3 minutes in the NSO group compared to 70.0 minutes to 62.78 minutes in the placebo group. There was a significant difference in how patients reported their global impression of change between the NSO and placebo groups. No clinically important changes in blood parameters were noticed in the safety analysis.