Is hair serum a heat protectant? April 25, 2022 17:53 Updated Hair serum contains ingredients that can help defend your hair from direct heat while bringing essential nourishment to each strand of hair. Learn How To Use A Hair Serum Related articles Will this hair serum weigh my hair down? What does hair serum do? Can I apply hair serum directly on my scalp? Is hair serum good for color treated hair? How should I use a hair serum? Comments 0 comments Article is closed for comments.