What is the main function of heat protectant products?

Heat protectant products are specifically designed to shield hair from heat damage caused by styling tools such as flat irons, curling wands, and blow dryers. These products typically contain ingredients that form a barrier around the hair strands, helping to minimize the direct impact of high temperatures. By creating this protective barrier, heat protectants can reduce the likelihood of moisture loss, breakage, and overall damage, allowing hair to maintain its health, shine, and integrity even when exposed to heat.

While adding shine, preventing moisture loss, and promoting hair growth are beneficial properties that some hair products may offer, they do not represent the main function of heat protectants. The primary purpose remains focused on protecting the hair from the potentially harmful effects of heat, making option C the most accurate choice.