Black cumin seed oil has a noticeable taste rather than a neutral oil profile. The product information describes it as spicy and slightly bitter, so it works best when you want that character in the food rather than when you need a mild background oil. Many people prefer using this type of oil in small amounts mixed into ready foods, dressings, dips, spreads, or other cold dishes where the flavour can be balanced with the rest of the meal.
It is not ideal for frying or high-heat cooking. The reason given in the product information is that black cumin seed oil contains heat-sensitive aroma compounds, so it is best added to cold dishes or stirred into food after cooking. This also helps preserve the qualities associated with its cold-pressed form, including delicate components such as phytosterols and fat-soluble vitamins mentioned in the product description.
If you are new to the flavour, start with a small amount in food and increase only if you enjoy the taste and tolerate it well. For internal use, follow the directions on the product packaging; herbal oils may not suit everyone.