. Hair Loss
Black seed oil may help in regrowing hair on bald regions of the scalp. Add black seed oil to olive oil in a ratio of 1 : 1 . Now rub this oil vigorously on bald patches. Wash this with water after about 30 minutes.
. Hair Health
For better scalp and hair health, one can apply black seed oil to the scalp in low concentration. Add black seed oil to coconut oil in a ratio of 1 : 2. Now, massage this into the hair. Wash after 30 minutes. This treatment keeps hair safe from hair loss and also makes the hair looks moisturized.
There is some anecdotal evidence that this oil can make hair grow faster.
The seeds of the annual flowering plant, Nigella Sativa, have been prized for their healing properties since time immemorial. While frequently referred to among English-speaking cultures as Roman coriander, black sesame, black cumin, black caraway and onion seed, it is known today primarily as black seed, which is at the very least an accurate description of its physical appearance. The earliest record of its cultivation and use come from ancient Egypt.
Black seed oil, in fact, was found in Egyptian pharoah Tutankhamun’s tomb, dating back to approximately 3,300 years ago.[i] In Arabic cultures, black cumin is known as Habbatul barakah, meaning the “seed of blessing.” It is also believed that the Islamic prophet Mohammed said of it that it is “a remedy for all diseases except death.”
Black seed oil is an analgesic. One can apply it on a tooth causing pain using a cotton ball undiluted. Only use 3 – 5 drops of oil. This relieves the pain. If this doesn’t provide much help, try clove essential oil for a powerful toothache pain relief.
. Headache relief
Apply a very small amount of black seed oil on a handkerchief. Keep this cloth with you and smell it every once in a while. The aroma of black seed oil relieves a headache.
. Did a wasp bite you ?
Black seed oil can take the sting out of a bite. Take some warm water and add 8 – 10 drops of black seed oil. Now dip the affected body part in this water. Keep it for about 5 minutes. There should be reduction in pain and stinginess of the insect bite. Throw away that water.
. Black seed oil for asthma
For this, one needs a vaporizer. Add a few drops of black seed oil to vaporizer. Let its aroma diffuse inside the house. Keep the asthmatic patient in this air. It improves respiration, dilates the bronchi and protects from bronchial spasm. Drink a coffee all this while to get some relief from asthma. Doing this home treatment can ward off an impending asthma attack.
Thymoquinone in black seed oil reduces airway inflammation caused by allergens and inhibition of excess mucus secretion by goblet cells. 
. Reduce an Allergy
This is a prominent effect of black seed oil. It can dull or minimise an allergic reaction. So, if you are allergic to something that happens in spring, start taking black seed oil a few days in advance. This can prevent the allergic symptoms like sneezing, sickness, red eyes, burning sensation and watering from the nose and eyes.
Add a teaspoon of black seed oil to milk, smoothie, shakes or any other beverage. This way, one doesn’t have to bear its taste. The best way to take it would be to drink it in concentrated lemon juice, which effectively masks its taste, but not the aroma. Do this 2 times a day.
. For alleviating a fever
Add 8 – 10 drops of black seed oil in half a quart of water in a spray bottle. Spray this water all over your body. This has an antipyretic  and cooling effect which alleviates the fever.
. Anti-bacterial effects of black seed oil
Nigella sativa oil can combat many strains of bacteria. For airborne bacteria, one should diffuse it in the air using a vaporizer. If the smell is too strong, mask it with more pleasing oils like lavender. For internal bacterial infection, add few drops of black seed oil to a beverage. For skin infections, apply it diluted in a carrier oil, preferable olive, coconut or grapeseed oil.
These are the bacterial strains which it kills.