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What do humectants in hair products do?

  1. Strip colour from hair

  2. Promote moisture retention

  3. Remove oil from scalp

  4. Act as a bleach

The correct answer is: Promote moisture retention

Humectants in hair products are ingredients that help attract and retain moisture in the hair. Option A is incorrect because humectants do not strip colour from hair, but rather they help to retain the colour and prevent it from fading. Option C is incorrect because humectants do not remove oil from the scalp, but instead they help to balance and maintain the hair's natural oils. Option D is incorrect because humectants do not act as a bleach, but rather they work to moisturize and hydrate the hair. Overall, humectants play a crucial role in keeping the hair hydrated and healthy.