There is not enough scientific evidence to establish a recommended dose of black seed oil. The right dose for you may depend on your age, health, and other factors.
Various doses of black seed oil have been studied in research. For example, in studies investigating the effects of black seed oil on patients with breast pain, a gel containing 30% black seed oil was applied to the breasts every day for two menstrual cycles.
In studies investigating whether or not black seed oil can improve sperm function, a dose of 2.5 mL of black seed oil was used twice daily for two months. To get advice regarding the best dose for you, speak to your healthcare provider if you plan to use black seed oil.