Despite the claims made online and by product marketers, it's not possible to reverse white hair if the cause is genetic. Once your hair follicles lose melanin, they can't produce it on their own. As melanin production slows, your hair turns gray, and then white when melanin production has completely stopped.
Mix 2-3 tsp of onion juice, 1 tsp of lemon juice and 1 tsp of olive oil. Massage into the scalp and hair and wash off after half an hour. An effective solution for greying hair, onion also promotes hair growth. It increases the enzyme, Catalase, thus darkening the hair.
Though, ageing is the primary reason of grey hair but premature greying of hair in early 20's or 30's is now common. Genetic factors, stress, lack of nutrition, chemicals, smoking or any underlying disease like anemia can also lead to premature greying of hair.
Hair lightening
According to these articles, the citric acid in lemon juice is a natural bleach, or oxidizing agent. It whitens hair by chemically reducing your hair's color pigment, or melanin. When exposed to the sun, the citric acid accelerates the bleaching process.
Genetics
Your makeup plays a big role in when (or if) you develop white hair. If you notice white hair at an early age, it's likely that your parents or grandparents also had graying or white hair at an early age. You can't change genetics.
Kraleti doesn't recommend plucking or pulling the hairs out. “If there is a gray hair you must get rid of, very carefully cut it off. Plucking can traumatize the hair follicle, and repeated trauma to any follicle can cause infection, scar formation or possibly lead to bald patches.”
Ghee is a Permanent Solution for Grey Hair
Ghee plays an important part in various medicines in Ayurveda. It seals moisture within the scalp and promotes good hair health. It is also a very effective medicine for grey hair.
Coconut Oil
Also, the oil has nourishing properties which is good for your hair. To use this oil for keeping whitening of hair at bay, you directly need to apply 2 tablespoons of virgin coconut oil to your scalp and hair. Massage for a few minutes and then leave for around an hour. Then rinse off with a mild shampoo.
Amla is known to slow down the process of greying and also helps in preventing hair loss. For the perfect Amla hair treatment, mix some powder with coconut oil or olive oil and apply it at night. Make sure you focus more on the roots. Let your hair soak in all the nutrients and wash it off in the morning.
Coconut Oil
Coconut oil and lemon juice mixed together can help darken the hair. The combination of these two causes a chemical reaction which darkens the hair naturally over a period of time. So make the most of it and get going.
Drink six ounces of fresh amla juice every day or massage your hair with amla oil one time each week. Amla is also known as Indian gooseberry. Black sesame seeds (Sesamum indicum). Two to three times a week, eat a tablespoon of black sesame seeds to slow down and possibly reverse the graying process.
Naturally occurring hydrogen peroxide can also build up in the hair, bleaching the color. Typically, white people start going gray in their mid-30s, Asians in their late 30s, and African-Americans in their mid-40s. Half of all people have a significant amount of gray hair by the time they turn 50.
As we get older, the pigment cells in our hair follicles gradually die. When there are fewer pigment cells in a hair follicle, that strand of hair will no longer contain as much melanin and will become a more transparent color — like gray, silver, or white — as it grows.
Amla oil is a natural oil used for hair health. It is made by drying a fruit called Indian gooseberry (Phyllanthus emblica ) and soaking it in a base oil. The oil is then filtered and purified. Amla oil is said to stimulate hair growth, as well as prevent hair loss and early graying.
Chemical hair dyes and hair products, even shampoos, can contribute to premature hair graying. Many of these products contain harmful ingredients that decrease melanin. Hydrogen peroxide, which is in many hair dyes, is one such harmful chemical.
Vitamin or mineral deficiency — Any deficiencies of vitamin B-6, B-12, biotin, vitamin D, or vitamin E can contribute to prematurely going gray. Similarly, deficiencies in minerals like calcium, copper, iron, protein and zinc can also contribute to graying hair earlier than usual.
When added to the hair and scalp, onion juice can provide extra sulfur to support strong and thick hair, thus preventing hair loss and promoting hair growth. The sulfur from onions may also help promote collagen production. Collagen in turn helps the production of healthy skin cells and hair growth.