What it is: A thickening, brow-boosting serum that borrows the best growth-supporting ingredients from the brand's award-winning hair Density Booster.Who it's for: Anyone with sparse, thinning, overplucked brows looking to enhance brow strength and thickness and promote healthy growth.What it does: Like our hair growth cycle, increasing brow density requires patience and consistency. Thankfully, Flourish's patented and proprietary Alpha Keratin 60ku CLINICAL® protein strengthens, thickens and en