Good question – I dont know. But seeing as when you wash your hair, you are also washing your scalp, they should be! Whether soap would be good enough rather than shampoo im not sure, but i expect it would be fine, as its the majority of ingredients in shampoo that nourish the hair protein, rather than scalp.
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emilyh commented on :
My dads nearly bald but he uses shampoo! 😛