What it is: A hair serum that is enriched with biotin and plant-based proteins to nourish and strengthen hair.

Hair Type: Straight, Wavy, Curly, and Coily

Hair Texture: Fine and Medium

Hair Concerns:
- Straightening/Smoothing
- Thinning
- Damage/Split Ends/Breakage

Highlighted Ingredients:
- Biotin of Synthetic Origin: Helps nourish hair.
- Plant-Based Proteins: Help make hair more resistant.

Ingredient Callouts: Free of parabens, formaldehydes, formaldehyde-releasing agents, phthalates, mineral oil, retinyl palmitate, oxybenzone, coal tar, hydroquinone, sulfates SLS & SLES, triclocarban, triclosan, and contains less than one percent synthetic fragrance. It is also vegan, gluten-free, cruelty-free, and comes in recyclable packaging.

What Else You Need to Know: 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.

Clinical Results: In a satisfaction test performed on 20 volunteers, after using product for 56 days:
- 95% felt their hair was more resistant
- 85% felt their scalp had been fortified