Dandruff 
Although dandruff can sometimes be caused by a fungal infection or other skin disease, in most cases it is produced when the scalp doesn’t receive a sufficient supply of blood. Consequently there is a lack of protein in the skin, which becomes dry and flaky.
Dandruff may also be due to a deficiency of vitamin B-6, or to an excess of vata dosha, which also makes the skin dry.
The treatment is simple. To improve circulation to the scalp, massage for a few minutes daily with neem oil (in a sesame oil base). If a fungal infection of the skin is causing the dandruff, the neem oil, which has disinfectant properties, will help heal this also.
A second option is to use some eggwhite mixed with lime juice. Put two eggwhites in a small jar or container with the fresh juice of one lime, mix together, and apply to your hair. Let it stay in your hair for a half hour, then wash the hair with neem soap. The eggwhite will provide the scalp with the lacking protein, and the dandruff will soon disappear.