Get this SEPHORA COLLECTION Strengthening Hair Serum with Biotin and Phytoprotiens on sale for $9 (Retail $18).
The Sephora Collection Strengthening Hair Serum leaves hair dense and thick. In as little as two months of use, hair is denser and thicker and hair fiber is strengthened and more resistant. This formula is enriched with biotin to improve support hair and plant-based proteins to help nourish hair, making it an ideal ally for achieving dense and thick hair. Its leave-in formula is particularly pleasant to use and does not leave a greasy film on hair.