Prime Day's Best Hair Growth Secrets for Thick Tresses Start at $6

Made with biotin, rosemary oil, salicylic acid and niacinamide, this moisturizing solution exfoliates, cleanses and hydrates the scalp to promote stronger and fuller hair. Use this in the shower as a second step after your Dr. Groot shampoo, which is also on sale right now.

Recommended for daily use, this is a gentle formula that is designed to promote denser, fuller hair. It’s a gentle formula made with rosemary, plant proteins and ceramides to stimulate the hair shaft while reducing breakage.

Reduce signs of shedding thanks to this serum, made with plant-based phytoactives to improve hair wellness, soothe the scalp and increase the appearance of hair density and thickness.

Got a dry scalp? Regenerate the protective moisture barrier to strengthen your roots and provide a healthy foundation for hair growth.

Paige DeSorbo swears that regularly combing her scalp with a lice pick has resulted in thicker, fuller hair. "I have been picking my scalp with a lice [comb] once a week for like six months and I’m not kidding, I really think it’s helped my hair grow and be thicker," she told E!.

Unlock the secret to fuller, thicker hair with this nighttime serum by Nioxin. It strengthens and protects, energizing the scalp with essential nutrients for improved growth.

Fast-absorbing and non-greasy, this serum reduces shedding thanks to a bio-tanical blend that keeps your scalp hydrated and roots boosted.

This affordable gem is loved by celebs including Kenya Moore, Madison LeCroy and Kandi Burruss. "All you have to do is, when you have shampoo in, just run this through your hair to remove product build-up and anything else. You've got to get one of these because, guess what, that's what's gonna make the hair grow," said LeCroy.

Formulated with ingredients including tea tree, gentle lactic acid, lipids, and peptides, Nutrafol's fast-absorbing serum reduces breakage that starts at the root and supports a healthy scalp microbiome. With consistent use, you'll notice fuller, thicker hair.

This celeb-loved oil features a nutrient-rich blend of biotin, mint, and essential oils to support your scalp and strands from root to tip. The formula encourages natural thickness and infuses moisture into your scalp.

Keep breakage at bay with Tangle Teezer's original detangling brush, that protects vulnerable strands in and out of the shower.

Not only does this serum work to improve the appearance of thinning hair, it also nourishes the scalp and combats dryness and product buildup. It’s non-greasy and lightweight, leaving no residue behind.

Made with caffeine, plant-based peptides, copper tri-peptide-1, and more powerhouse key ingredients, this lightweight serum refreshes the scalp while improving vitality, without weighing you down.

Minoxidil is the only FDA-approved ingredient for hair growth, and helps to maintain hair density, treat thinning hair and hereditary hair loss, and support fuller regrowth. This four-month, unscented foam supply has clinically proven results.

Revitalize your scalp to produce thicker hair with this therapeutic elixir that provides root lift and volume. This concentrated serum stimulates hair follicles while keeping the scalp nourished.

Made with apple stem cells, aloe and sodium hyaluronate, this serum supports a healthy environment for hair follicle health and hydrates the scalp.

This serum is formulated with a blend of botanicals and studied ingredients to support healthier-looking hair from root to tip, improving the look of density without weighing hair down or leaving a greasy look/residue behind.