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Onion is rich in sulfur. This mineral is one of the main building blocks of hair. It improves blood circulation and provides the hair follicles with sufficient nourishment. Onion also has anti-bacterial properties, so it helps with scalp infections that might contribute to hair loss.
Furthermore, it contains the enzyme catalase, which is an anti-oxidant that can prevent premature graying for some people (I also wrote an article about the top natural supplements for treating premature gray hair).
Honey is a humectant and helps trap moisture in the hair and nourishes the hair. It also has antibacterial properties which help in keeping scalp infections away.
Lemon juice helps fight scalp infections. Rose water has a cooling and soothing effect on the scalp and reduces scalp irritation. Rosemary essential oil helps in hair growth. Instead of rosemary oil you can also use lavender oil or peppermint oil. Lemon juice, rosewater and essential oils also help in camouflaging the smell of onion juice.