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Been about 4-5 months without using shampoo and have to say I do feel some positive benefits to my hair and scalp. It's helped with dandruff and thin greasy hair issues I'd always kinda had as a shampoo-champoo.
Read some bro science experiences with it and the jist of it seems to be that your scalp has some little-explored ways to regulate itself and when shampoo washes away the natural amount of grease, it starts producing more and more.