9 Best Shampoos for Thinning Hair, According to 27 Testers

To create this list, we started by consolidating dermatologist-recommended formulas and best-selling shampoos targeted at thinning hair. We assigned the shampoos to 27 Glamour testers—including both men and women with a wide range of hair types, textures, and concerns, from postpartum shedding and hormonal shifts to stress-related loss and general density changes.

Each reviewer used their assigned shampoo consistently for at least six weeks—the minimum time frame experts told us is needed to begin seeing meaningful results. Reviewers were asked to follow the product’s directions and track changes in shedding, overall fullness, and density (especially around the hairline and crown). They also evaluated the shampoo’s fragrance (Was it pleasant or overpowering?), how well it lathered and rinsed out, and overall value—factoring in how much product they needed per wash and whether the results justified the price. Their feedback helped us determine which shampoos made the final list—and how we categorized each one.

“The effectiveness [of a shampoo for thinning hair] varies depending on the reason for hair loss,” says Hardik Doshi, MD, FACS, double-board-certified lead surgeon at hair-restoration studio Ample. “They’re not a solution for hair loss, but they can assist in creating an optimal environment for the survival of existing hair follicles on the scalp.” In other words, if you’re losing hair because of pattern baldness or your hormones, a shampoo alone can’t restore your full head of hair. A multifaceted, holistic approach developed with a dermatologist or trichologist is needed, involving a personalized treatment that usually also includes medication, dietary changes, and stress reduction. “Shampoos are rarely an independent type of solution, yet, together with the treatment, they can help to support through the restoration process,” says Dr. Doshi.

What a shampoo can do is help maintain a healthy scalp environment that’s needed for hair growth and to prevent buildup and irritation that could get in the way of that growth, says Shab Caspara, a board-certified New York–based trichologist and founder of hair care brand Leona. They can also add more volume and density, which make hair appear fuller.

“The most common cause is androgenetic alopecia, also called male- or female-pattern hair loss,” says Brooke Jeffy, MD, a board-certified dermatologist who specializes in hair loss and skin care. “This causes a widening of the part in women and a receding hairline or bald spot in men.” This kind of hair loss is a result of a hormone called dihydrotestosterone (DHT) attacking the hair follicle, says Friese. “When this happens, the follicle starts to minimize and grow thinner and thinner hair, until it closes and the hair stops growing out of that follicle.”

Other hair-loss causes include:

• Hormonal imbalances
• Autoimmune disorders
• Nutrition deficiencies
• Ongoing stress
• Pregnancy
• Dandruff
• Rapid weight loss
• Rough handling of hair (like very tight ponytails)
• Cosmetic treatments
• Shunts (a small patch that might be shaved on the head during a medical procedure)
• Menopause (this isn’t an “official” menopause symptom since it’s not related to estrogen loss, but it’s commonly reported at the beginning of menopause, and studies show that more than half of postmenopausal women over age 50 will have thinning hair)

“Hair thinning is one of those things that can sneak up on you without you realizing the warning signs,” says Dr. Doshi. “Normal daily shedding is no cause for alarm, but thick clumps of hair loss for sudden reasons, loss concentrated in one place, dryness, brittleness, or new cowlicks forming all indicate that something is going on.”

“Thinning hair is a slow, gradual process where individual hairs lose circumference,” says Mark Townsend, a celebrity hairstylist. This is not to be confused with hair breakage or loss, which is when strands fall out from the root. This thinning usually begins with the shrinking of hairs around the front hairline, the nape of the neck, or at the crown of the head. Women usually experience it as a widening of their parts.

“If your hair is feeling less dense (like your ponytail seems to have less girth), or you are seeing more scalp than hair, more hair in your brush, or more on the shower floor when you shampoo, then you may be experiencing some hair thinning,” says Friese.

These ingredients crop up most commonly in shampoos for hair growth and thinning hair:

• Ketoconazole: A drug that can help lessen scalp irritation and encourage growth by reducing fungus caused by dandruff and acne
• Minoxidil: An FDA-approved medication that can potentially reverse hair-follicle miniaturization by increasing blood circulation. It needs to be able to penetrate the scalp in order to be effective, however, which a shampoo can’t do alone as it’s rinsed off.
• Rogaine: A topical medication licensed by the FDA that has demonstrated efficacy in stimulating hair growth by bringing blood and nutrients to the scalp. It comes in a range of formulations and strengths, says Dr. Doshi.
• Biotin: A B vitamin that potentially “supports keratin production to increase hair volume and density, and strengthen the hair shaft,” says Michele Green, MD, a board-certified cosmetic dermatologist in New York City.
• Niacin: An antioxidant with anti-inflammatory properties that can strengthen hair follicles and promote overall scalp health
• Saw palmetto: A natural plant extract that may potentially slow hair loss
• Rosemary, caffeine, peppermint: Natural ingredients that stimulate blood flow to the scalp

• Take into account the cause of your hair loss. If your loss is genetic, a shampoo will not be the one-stop solution, though it may be helpful if you have dandruff. This cause will be best determined by talking to a dermatologist or trichologist.
• Figure out your hair type and texture. “Fine, thin strands need ultra-lightweight formulas, while thick, coarse hair can withstand richer products,” says Dr. Doshi. If you have curly, coily hair, some shampoos for thinning hair may leave you feeling drier than normal, so look for ones with hydrating ingredients. You should avoid heavy ingredients, which may clog follicles.
• Avoid harsh sulfates and parabens. “Gentle cleansing agents are very important in a shampoo specifically for thinning hair, as the scalp needs to be protected with special care,” says Caspara. “Harsher cleansing agents such as sodium laureth/lauryl sulfate can strip the microbiome of healthy bacteria and irritate the scalp, ultimately hindering healthy hair growth. Stimulating ingredients that can increase blood circulation at the scalp can also benefit those who suffer from thinning hair. Thickeners that can instantly plump up the hair shaft and provide a gratifying feeling of thicker and fuller hair can help ease the stress of dealing with hair thinning.”
• Be patient. Using a shampoo alone may not yield the exact results you want if you’re experiencing serious thinning. For that, you’ll want to talk to a derm or trichologist to develop an overall routine that is suitable for you, possibly including medication and dietary changes. That said, if you don’t have intense thinning, after six to eight weeks, watch for more volume and fullness in the appearance of your hair.

Most shampoos for thinning hair take at least six to eight weeks of consistent use to show results. “They can assist in creating an optimal environment for the survival of existing hair follicles,” says Dr. Doshi. Early signs of progress may include less shedding, a healthier-feeling scalp, and slightly fuller-looking hair.

Many hair-loss shampoos for men focus on thickening and scalp health, which can support hair density over time. Ingredients like ketoconazole, caffeine, and saw palmetto may be beneficial, especially for male-pattern hair loss. Our tester liked Rogaine’s 2-in-1 Thickening Shampoo + Conditioner for its simplicity and noticeable results after consistent use.

Alpecin’s caffeine-infused shampoo may support scalp and hair health, particularly in cases of early-stage thinning, according to Dendy Engelman, MD, FACMS, FAAD, a board-certified cosmetic dermatologist and Mohs surgeon at the Shafer Clinic in New York City. “Caffeine has been shown in some lab studies to stimulate hair follicles and potentially help with hair shedding,” she says. Though research is still emerging and more studies are needed to confirm its effectiveness, caffeine shampoos like this one can be a moisturizing complement to a larger hair fall regimen. For more advanced or persistent hair loss, Dr. Engelman suggests speaking with a dermatologist about clinically backed treatments such as minoxidil or prescription options.

• Hardik Doshi, MD, FACS, a double-board-certified lead surgeon at hair-restoration studio Ample
• Brooke Jeffy, MD, an Arizona-based board-certified dermatologist who specializes in hair loss and skin care
• Caroline Robinson, MD, FAAD, a board-certified medical and cosmetic dermatologist
• Dendy Engelman, MD, FACMS, FAAD, a board-certified cosmetic dermatologist and Mohs surgeon at the Shafer Clinic in New York City
• Gretchen Friese, a certified trichologist at hair-restoration company BosleyMD
• Shab Caspara, a board-certified New York–based trichologist and founder of hair care brand Leona
• Michele Green, MD, a New York–based board-certified cosmetic dermatologist
• Mandy Buechner, a hair-loss practitioner and certified trichologist
• Mark Townsend, a celebrity hairstylist