Hair extension: Garlic oil nourishes the hair from its roots, and thus leads to an increase in its length, and makes it much stronger because of the vitamins contained in garlic oil. Fighting dandruff: Garlic oil is very effective in eliminating dandruff. As a result of containing sulfur, it also cleanses the scalp, and treats fungal infections and itching. Because it is an effective antifungal, bacterial and microbial, and with continued use, garlic oil moisturizes the scalp to make it healthier. Preventing hair loss: Garlic oil helps nourish hair follicles and strengthen them from their roots, thus helping to intensify hair and prevent hair loss.