What is the minimum time for the products to penetrate before the scalp is rinsed or washed?

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What is the minimum time for the products to penetrate before the scalp is rinsed or washed?

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Two hours is the minimum. Four hours or overnight is better. These products are designed to penetrate the tissue in the hair follicle in order to remove build-up and to stimulate the nervous and circulatory systems. This process takes time.

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