Cold shock therapy promotes hair growth in association with upregulation of cold-inducible RNA-binding protein and vascular endothelial growth factor - PubMed a small step towards understanding larger processes. Unfortunately, scientists have not found a complete understanding of why and how this happens and the full range of elements involved. However, they did tests. However, it’s a jump. Cold acting on the follicle muscle actually helps the hair by stimulating and growing the follicular muscle and causing that growth to affect the stem cells of the follicle.