Glycerin is naturally formed during the cold-process soap-making method. Glycerin is a natural humectant (softener and moisturizer) which helps draw and retain moisture into the skin and scalp. It is believed to penetrate hair and skin, softening and swelling it, making it water retentive.
Daily Hair Tip
A humectant hair product attracts moisture to the hair while an anti-humectant repels moisture. Use a humectant to combat static electricity and an anti-humectant to deal with humidity.