During transition period: hair is sooooooooooooo oily, and itch so muchhhhhhhhhhhh.. continue with washing hair with plain water and massage with tip of fingers for a month (no chemical onto ur head) or you'll need to start all over again.

You will need to pass that transition period of 2-3 weeks depending on ur own hair oil sebum. Need to adjust hair environment from using chemical to learn how to produce own oil instead in smaller quantity. (When we use shampoo, it'll remove oil from scalp and this leads to our scalp producing so MUCH oil to balance the environment on our scalp.. that is why we have dandruff and also itch like crazy after 2-3 days not using shampoo.)

After 1 month for mine.. it's not oily, it's not itchy .. as i wash my hair with only plain water and massage with tip of fingers (not finger nails ah daily. Now after 9 months ( i alternate wash my hair only with plain water and massage with fingers).

Compare with using shampoo last years.. after 2-3 days if i din wash with shampoo, my hair will itchy like crazy.
Hair loss so much and got dandruff and also oily - i tried b4 pantene, sunsilk, johnson, herbal, professional branded shampoo, organic shampoo.

Now i only use water.. no longer hair loss, it grow more, no more itch, and amazingly no split ends with long hair at this length - last few years i had to cut it short coz loss hair and split ends.

And i notice if i eat a lot of MSG food, my hair shed more even if i wash using plain water.

Therefore apart from not using any chemical on ur scalp, we should avoid as much outside food as possible becos of MSG.