nutrafol

Nutrafol for Women

What it does: A special compound in these supplements helps reduce damage from free radicals, inflammation, and stress, which can contribute to a hair-growth slump.

How to use it: Take four capsules daily with a meal.

When you'll see results: Three to six months.

$88; Nutrafol.com.
Harklinikken Restorative Shampoo

Harklinikken Restorative Shampoo

What it does: A gentle proprietary complex (great for those with a dry or sensitive scalp) deep cleans, helps regulate sebum production, and creates a healthy environment for hair growth.

How to use it: Apply it to wet hair, massage it into your scalp with a decent amount of pressure, and rinse.

When you'll see results: Three to four months.

$68; Harklinikken.com.
R+Co Crown Scalp Scrub

R+Co Crown Scalp Scrub

What it does: Just as an exfoliator sloughs dead skin cells from your face, this treatment removes buildup, excess oil, and dandruff flakes as it rebalances the scalp and unclogs follicles so hair can grow unimpeded.

How to use it: Swap it in for your shampoo once a week, massaging a walnut-size amount into your scalp until the grittiness dissolves. Rinse and condition.

When you'll see results: You'll notice a fresher-feeling scalp with one use.

$38; RandCo.com.
Philip Kingsley Tricho 7

Philip Kingsley Tricho 7

What it does: Applied to the scalp, this liquid formula aims to improve circulation, ward off free-radical damage, and counteract hormonal activity that can have a slowing effect on your hair-growth cycle.

How to use it: Daily use is key. Tilt your head back and use the pipette to apply the drops evenly across the crown of your head. Comb through and do not rinse.

When you'll see results: Six to 12 weeks.

$89; PhilipKingsley.com.
Reserveage Nutrition Keratin Hair Booster Powder with Biotin

Reserveage Nutrition Keratin Hair Booster Powder with Biotin

What it does: The easy-to-ingest powder supplement contains everything hair loves—keratin (the protein that makes up your strands), biotin, and vitamins and minerals—to promote shine, strength, and healthy growth and help reduce shedding.

How to use it: Put one scoopful in a glass and add six to eight ounces of water or any hot or cold noncarbonated beverage.

When you'll see results: Three months.

$32; Amazon.com.
Briogeo Hair Cap System

Briogeo Don't Despair, Repair! Deep Conditioning Hair Cap System

What it does: The two-part weekly treatment fights damage from relaxers, heat, and color with ultrahydrating and reparative argan oil, nourishing algae extract, and moisturizing panthenol.

How to use it: After you shampoo, apply the mask to the bottom half of hair and massage for 30 seconds. Next, put on the cap coated with reparative goodness, sit for 15 to 60 minutes, and rinse.

When you'll see results: One use.

$36; Sephora.com.
ColorProof BioRepair-8 Thickening Blow Dry Spray

ColorProof BioRepair-8 Thickening Blow Dry Spray

What it does: The multipurpose solution offers color and heat protection as well as increased volume. It also nourishes the scalp and combats thinning with a fruit-derived stem cell complex.

How to use it: It's heat activated, so apply it to your clean, damp hair and scalp after shampooing and before blow-drying.

When you'll see results: You'll see the thickening benefits instantly and, with continued use, an improvement in your scalp's condition.

$32; ColorProof.com.