Now before you start getting defensive and tell us all the wonderful stories your mum told you just relax. This is about facts, we don’t know your mum and am sure she is wonderful. BUT
Hair once outside your scalp is dead, the living part of hair is beneath your skin, it grows here under several layers of tissue and the base. Within the follicle stem cells divide rapidly, as new cells are formed the old ones are pushed up and form the hair shaft, the part that you eventually see. As hairs become part of the shaft, they undergo a process called keratinization, in which they become filled with keratin. So, technically, instead of being made up of pure keratin, hair is made up of dead cells that are filled with and surrounded by keratin.
So putting anything on your scalp to encourage growth is almost pointless because the work is done internally so it all comes back to your DNA and Diet. Sure a massage on your scalp may increase the blood flow to your root marginally but not enough to make a difference.
So if your onion pulp or egg won’t penetrate the skin, how is it meant to feed the root of the hair, the only part that is living? How is oil going to do anything?
Maintaining healthy hair outside the skin, it’s important to understand the following. Hair is dead and we have to keep it in the best condition as long as we can. Regular trims to remove damage from chemicals or environment, regular cleansing and not coating the hair strand unnecessarily, like oils or silicone.
Excess oil on the scalp will create a PH issue for the tissue we call scalp therefore could encourage hair fall. Oil on the hair strand doesn’t do anything other than coat the strand and can in fact dehydrate the hair by increasing the temperature of the strand.
Healthy hair is about diet, lifestyle and your DNA. Eat a balanced diet, avoid stress ( as much as humanly possible ) don’t over style your hair and get regular trims every 6-8 weeks.