Black seed oil has been explored for topical comfort as well as oral use. A clinical trial followed menstrual-pain outcomes over three cycles.
Study design
Randomised, double-blind clinical trial; 124 young adults; topical oil protocol; three menstrual cycles.
Reported findings
A 2020 trial assigned 124 female students aged 18–22 to a topical black seed oil protocol or an olive-oil comparison. After three menstrual cycles, the authors reported a modest reduction in pain severity favouring black seed oil.
Interpreting the result
This was a topical protocol in a narrow age group, and the reported difference was modest. It does not establish an equivalent effect from oral use or address every cause of menstrual pain.
Why this study is useful
Topical oil research is a distinct part of the black seed oil story. Here the outcome was menstrual discomfort, measured across several cycles. Looking at a repeated pattern gives the study a different focus from experiments that assess a single application. The route matters: this was external application, not an oral supplement trial.
Source
Samadipour E, Rakhshani MH, Kooshki A, Amin B. Local Usage of Nigella sativa Oil as an Innovative Method to Attenuate Primary Dysmenorrhea: A Randomized Double-blind Clinical Trial. (2020).
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