What are the benefits of hair serums? Salon professional hair serums typically have a high concentration of key ingredients targeting specific scalp and hair concerns. There are hair serums for hair growth, hair serums for frizz, hair serums of curly hair, hair serums for thinning hair and all other types of hair concerns. Discover our collection of best hair serums for all hair types, scalp and hair concerns. Which serum is best for your hair? Take our hair quiz to find the best hair treatment to prime and pamper your scalp and hair.