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The 8 Best men shampoos of 2024

Are you trying to find men shampoos among various brands on the market but aren’t sure where to begin? To assist you in finding the right one, we’ve put together a list of the 7 best to help you pick the perfect one!

We investigated and evaluated a number of the top-selling men shampoos on the market in order to create our list of the best. Making a decision among the many options available is never simple. There are an infinite number of models available, each with a distinct price. And as you’ll find out, the best options aren’t usually the ones you imagine! This comparison is rich and relevant because of the numerous factors that were employed. You will find products featured in this ranking not only based on their pricing but also on their features and other customers reviews. To write this review, we completed 20 hours of research and did 64 men shampoos tests. You won’t need to pick products at random any more. If you’re unsure of what to look for, browse our list and consult the buying guide!

An overview of our top picks

Table of contents

The best men shampoos you can buy today

No. 1
Tea Tree Special Shampoo, Deep Cleans, Refreshes Scalp, For All Hair Types, Especially Oily Hair, 10.14 fl. oz.
  • Get a head start every morning and experience the invigorating tingle
  • Contains special ingredients and tea tree oil to help wash away impurities, leaving hair fresh, clean, and full of vitality and luster
  • Tea tree oil, peppermint, and lavender refresh the scalp and leave hair smelling great
  • Ideal for All Hair Types
SaleNo. 2
American Crew Shampoo for Men, Daily Deep Moisturizer, Naturally Derived, Vegan Formula, Citrus Mint Fragrance, 8.45 Fl Oz
  • DEEP MOISTURIZING SHAMPOO: A hair and scalp wash rich in conditioning emollients that leaves hair feeling soft all day without causing build-up or greasy hair.
  • HAIR CARE FOR MEN: The ultra-hydrating formula cleanses while the naturally certified American Crew Citrus Mint signature fragrance energizes and invigorates.
  • KEY BENEFITS: Infused with moisturizing Vitamin B5 to promote healthy looking hair, this vegan, silicone-free shampoo is suitable for daily use on normal to dry hair.
  • HOW TO USE: Wet hair thoroughly. Massage a small amount into hair and scalp. Rinse well.
  • WHO WE ARE: American Crew is a leader in, Men's Grooming for HAIR, BODY, BEARD, SHAVE, STYLE categories. American Crew's ongoing commitment is to elevate men's style and enhance their personal image.
  • English (Publication Language)
SaleNo. 3
Method Men 2-in-1 Shampoo + Condtioner, Juniper + Sage, 14 Ounces.
  • Contains (1) 14 ounce bottle of men's 2 in 1 shampoo + conditioner
  • Combined shampoo + conditioner with plant-based cleansers and conditioners.
  • Made without parabens or phthalates.
  • Infused with argan + jojoba oil.
  • Bottle (minus cap) made with 65% recycled plastic
No. 4
Rocky Mountain Barber Company Men's Shampoo - Tea Tree Oil, Peppermint & Eucalyptus for All Hair Types
  • Simple Ingredients - Feel good about what you’re using on your hair
  • No Artificial Fragrances – Our shampoo uses essential oils for its scent and contains no artificial fragrance.
  • Lathers Easily – Our shampoo can be used daily and lathers quickly
  • Forest Mint Scent - Our signature scent features a blend of Peppermint Oil, Tea Tree Oil and Eucalyptus Oil
  • Made In Small Batches - Means a fresher shampoo with fresher ingredients.
SaleNo. 5
Keeps Hair Regrowth Treatment Mens Shampoo for Fuller, Thicker Looking Hair, 8 oz - Thinning and Hair Growth Shampoo for Men - DHT Blocker - Infused with Biotin, Caffeine, & Saw Palmetto
  • Thickening Shampoo for Men: Better hair is just a rinse away with Keeps Thickening Shampoo. Our shampoo is formulated to make thinning hair look thicker and fuller. It also works great to complement and enhance results of male hair loss treatment. Includes one 8 oz bottle.
  • Thicker & Fuller Hair: Every day, sweat, dirt, and styling products gather on your scalp, clog up your hair follicles, and weigh down your locks. Left unaddressed, they can damage follicles. Keeps Thickening Shampoo was developed by experts to help keep your follicles clean and healthy, resulting in thicker, fuller hair.
  • Natural Ingredients: We only use natural, science-backed ingredients in our hair products including biotin, caffeine, green tea and saw palmetto. The Keeps formula is paraben-free, which means no harmful ingredients that will irritate your scalp or contribute to shedding.
  • Promotes Healthy Hair Growth: Take action to keep your hair and feel your best. Use this thickening shampoo with the Keeps Thickening Conditioner to complete your hair care routine.
  • Hair Loss Stops with Us: If you've gone from barely noticing your hairline to obsessing over it every day, you know better than anyone: Losing your hair sucks. We built Keeps to give guys across the country an affordable, expert-backed plan to make hair loss a thing of the past.
No. 6
Every Man Jack 2-in-1 Tea Tree + Cedar Shampoo + Conditioner - Thicken, Cleanse, and Hydrate Hair with Coconut, Tea Tree Oil - Notes of Fresh Cedar - Naturally Derived and No Harmful Chemicals -24oz
  • QUICKNESS AND THICKNESS: Simplify your hair cleansing routine with naturally derived formula that cleanses, hydrates, and boosts volume.
  • SMELL REFRESHED AND RENEWED: Tea Tree and Cedar oils combine to leave you smelling like a Viking on a spa day.
  • TRUSTED BY MORE THAN 5 MILLION MEN: Born at the base of Mt. Tam, CA. Proudly made in the US and B Corp Certified. Loved by millions of men the world over.
  • NATURALLY DERIVED INGREDIENTS: Every bottle is packed with Coconut-Derived Surfactants for a deep clean, Glycerin for moisture, and Soy Protein to help boost and strengthen your luscious locks.
  • THE DREAM TEAM: From body to beard, lotion to deodorant, we’ve got everything you need. Stick with your favorite scent across every product or mix and match to make it your own.
No. 7
Old Spice Fiji 2-in-1 Shampoo and Conditioner Set for Men, Coconut & Tropical Wood Scent, Get Up To 80% Fuller-Looking Hair, Barbershop Quality, Fresh & Clean Hair, 21.9 Fl Oz Each, 2 Pack
  • 2 BENEFITS, ONE BOTTLE: Old Spice Fiji 2in1 conditions and cleanses for legendary freshness from start to finish
  • BE ISLAND FRESH, MAN: Smell like vacation with the scent of coconut and tropical wood
  • BARBERSHOP QUALITY: Inspired by barbers and crafted for barbershop quality results
  • SO FRESH, SO CLEAN: Leaves hair with a fresh, attractive scent, a mansome look, and a sand-free feel
  • BE AMAZING: Feel like you just left an oceanside barbershop
No. 8
Old Spice Reinvigorate Shampoo for Men with Tea Tree Oil, 21.9 Oz Each, Twin Pack
  • COOL, IT COOLS: This shampoo invigorates hair and cleans the scalp with a cooling matched only by a skiing Mt. Kilimanjaro
  • MANLY SCENTS FOR COOL DUDES: The arctic tundra is smelled often by polar bears and now by you in your shower, daily
  • BARBERSHOP QUALITY: Inspired by barbers and crafted for barbershop quality results
  • SO FRESH, SO CLEAN: Leaves your mansome mane clean, incredibly fresh, and unmistakably minty tea tree
  • BE AMAZING: Feel like you just left the absolute coolest (double meaning!) barbershop
SaleNo. 9
DOVE MEN + CARE Fortifying 2 in 1 Shampoo and Conditioner for Normal to Oily Hair Fresh and Clean with Caffeine Helps Strengthen Thinning Hair 3 oz
9,226 Consomer Reviews
DOVE MEN + CARE Fortifying 2 in 1 Shampoo and Conditioner for Normal to Oily Hair Fresh and Clean with Caffeine Helps Strengthen Thinning Hair 3 oz
  • 2-IN-1 SHAMPOO AND CONDITIONER: this Dove 2 in 1 shampoo and conditioner is designed to deeply clean and invigorate hair for men with active lifestyles
  • CLARIFYING MENS SHAMPOO AND CONDITIONER 2-IN-1: Dove Men+Care 2-in-1 Fresh and Clean functions both as a shampoo and conditioner, simultaneously cleaning and conditioning hair in one step
  • STRENGTHENS AND THICKENS THINNING HAIR IN MEN: This effective two-in-one formula also helps strengthen hair, leaving it visibly thicker, healthier, and more resilient against hair breakage
  • HEALTHY HAIR SHAMPOO AND CONDITIONER: Infused with a blend of caffeine and menthol, this shampoo and conditioner 2 in 1 washes away dirt and grease and leaves hair feeling refreshed
  • MEN'S THICKENING SHAMPOO AND CONDITIONER: this 2 in 1 Shampoo and Conditioner is specially engineered for men and suitable for daily use for stronger, more resilient hair for an active lifestyle
No. 10
Head & Shoulders 2-In-1 Shampoo And Conditioner, Anti Dandruff Treatment And Scalp Care, Lemon-Lime Scent Of Old Spice Pure Sport, 31.4 Fl Oz Each, Twin (Packaging May Vary)
  • Clinically Proven. Up to 100% Dandruff Protection*. (*visible flakes, with regular use)
  • Head & Shoulders Old Spice Pure Sport Anti-Dandruff 2 in 1 Shampoo fights flakes and leaves your scalp smelling great
  • From the scalp care experts; the makers of America's #1 dandruff shampoo* (*based on volume sales)
  • Multi-symptom relief offers proven protection from flakes, itch* and dryness (*flakes and itch associated with dandruff)
  • Convenient 2 in 1 formula nourishes hair and scalp while cleansing and hydrating
No. 11
Harry's Men's 2 in 1 Shampoo and Conditioner for All Hair Types | Gentle & Refreshing | 14 Fl Oz, 3 Count
  • Cleans hair without stripping important natural oils
  • Cruelty free, Paraben-free, Sulfate-free, and dermatologist tested
  • Hydrating and conditioning enough for daily use
  • Good for all hair types
  • Lather. Rinse. You know the drill. Includes notes of peppermint, eucalyptus, and lavender essential oils
No. 12
Old Spice Swagger 2-in-1 Shampoo and Conditioner Set for Men, Cedarwood Lime Scent, Get Up To 80% Fuller-Looking Hair, Barbershop Quality, 29.2 Fl Oz Each, 2 Pack
3,347 Consomer Reviews
Old Spice Swagger 2-in-1 Shampoo and Conditioner Set for Men, Cedarwood Lime Scent, Get Up To 80% Fuller-Looking Hair, Barbershop Quality, 29.2 Fl Oz Each, 2 Pack
  • 2 BENEFITS, ONE BOTTLE: Old Spice Swagger 2in1 conditions and cleanses for legendary freshness from start to finish
  • SMELL LIKE A MAN: Smell shockingly self-assured with the scents of cedarwood and lime
  • BARBERSHOP QUALITY: Inspired by barbers & crafted for barbershop quality results
  • SO FRESH, SO CLEAN: Leaves hair with a fresh, attractive scent and a mansome look
  • BE AMAZING: Feel like you just left the barbershop
SaleNo. 13
American Crew Shampoo for Men, Daily Cleanser, Naturally Derived, Vegan Formula, Citrus Mint Fragrance, 8.45 Fl Oz
  • CLEANSING SHAMPOO: Enriched with Vitamin B5 for moisture, our silicone-free Daily Cleansing Shampoo is ideal for an everyday haircare routine.
  • HAIR CARE FOR MEN: The nondrying vegan formula washes away excess oil, leaving hair more manageable, looking healthy, and feeling soft.
  • KEY BENEFITS: Infused with our energizing, naturally certified American Crew Citrus Mint signature fragrance. Best for men with normal to oily hair and scalp.
  • HOW TO USE: Wet hair thoroughly. Massage a small amount into hair and scalp. Rinse well.
  • WHO WE ARE: American Crew is a leader in, Men's Grooming for HAIR, BODY, BEARD, SHAVE, STYLE categories. American Crew's ongoing commitment is to elevate men's style and enhance their personal image.
No. 14
DOVE MEN + CARE Shampoo Charcoal + Clay 3 Count For Healthy-Looking Hair Naturally Derived Plant Based Cleansers 25.4 oz
  • Designed for men seeking for naturally derived & sustainable shampoo
  • This best men’s shampoo is 90% naturally derived, with plant-based cleansers
  • For cleaner, healthier, purified hair
  • This men shampoo is enriched with purifying Charcoal and earthy notes of Nutmeg + Clay
  • Hair care for stronger, healthy hair every day
  • 100% recycled & recyclable plastic bottle. Cruelty-free shampoo. Globally, Dove does not test on animals
No. 15
Viking Revolution Biotin Mens Shampoo - Eucalyptus and Peppermint Shampoo with Jojoba Oil and Mint Oil - Hair Loss Shampoo for Men with Biotin - Mens Shampoo for Thinning Hair (17 Oz)
  • No Itching or Irritation - With the Eucalyptus and Peppermint men's Shampoo say goodbye to itchy irritated skin and get rid of dandruff. Wash your hair, look and feel great.
  • Eucalyptius and Peppermint Oil - This natural shampoo is made with excellent quality Jojoba Oil and Olive Oil to give you the deepest moisturization and leave your hair smelling great. With its key ingredients, Eucalyptus and Peppermint oil, this mint shampoo will make you feel an unmatched freshness in every shower.
  • Solution for Thinning Hair - Our natural eucalyptus shampoo also has a powerful ingredient to fight back thinning and loosing hair: Biotin. Our set is formulated to work in all types of hair and be color safe, while promoting fresh and clean hair.
  • Easy to Use Pump - When connecting the pump to our shampoo bottle, make sure that the pump is tightly screwed onto the bottle. Turn the spout counterclockwise, a few rotations, and the dispenser will pop open. In just a few pumps, you will have the best shower of your life!
  • The Viking Promise: If for any reason, you’re not completely satisfied, simply contact us, and we’ll take care of it.
SaleNo. 16
OGX Hydrating + Tea Tree Mint Shampoo, Nourishing & Invigorating Scalp Shampoo with Tea Tree & Peppermint Oil & Milk Proteins, Paraben-Free, Sulfate-Free Surfactants, 13 fl oz
  • HELP HYDRATE & NOURISH YOUR HAIR with our shampoo for damaged, oily, & frizzy hair that needs extra moisturizing & nourishing love. Our daily use formula helps to smooth hair, reducing appearance of split ends for a healthy-looking glow
  • NOURISH & DETANGLE: OGX's Tea Tree Mint formula is for straight hair, curly hair, thick hair, thin hair. Gentle enough for fine hair & fierce enough for thick or coarse hair. Helps to nourish, rejuvenate & detangle hair as it works deep into every strand
  • BEAUTY PURE AND SIMPLE: OGX hair care products are inspired by nature. We don’t try to make hair look “perfect” because we’d rather make hair look fuller, smoother, straighter, curlier, or bouncier & smell irresistible while we’re at it.
  • ROCK WHAT YOU'VE GOT: OGX hair care products are designed to bring out the best in your hair, no matter what type or texture. Whether you need quenching moisture for curly hair, protection for colored hair, blowout cream, or matte pomade--we've got you.
  • REAL QUALITY, REAL BEAUTY: Unattainable looks don't inspire us but originality does. OGX hair & skin care product collections are here to help you look your best. We’re beauty, pure & simple.
No. 17
YICTEK Empty Plastic Travel Bottles Containers for Toiletries, TSA Approved Travel Size Toiletries Bottles Kit for Liquids Shampoo Conditioner Lotion, Carry-On Set for Women/Men
  • 🎁WHAT VACATION ESSENTIALS DO YOU USUALLY KEEP in your carry-on when you are traveling? This mini travel size toiletries bottles containers set may help you a lot, there are 1*2oz refillable silicone squeeze bottles,1*1.7oz plastic pump bottle, 1*2oz plastic sprayer bottles, 2*2oz empty hard plastic bottle, 2*0.33 ounce cream jars and one spoon, pipette and one funnel, and pre-printed label, perfect for your business trip or on vacations.
  • ✈PORTABLE TRAVEL ACCESSORIES WITH WIDE OEPNING MOUTH – Yictek empty travel tubes and toiletry bag meet the requirements for carry-on essentials at the airports worldwide for domestic and international travel. And these travel bottles are featured with a wide opening mouth, which could help you to fill shampoo, lotion and conditioner easily.
  • 🌳DURABLE CLEAR TOILETRY BAG,STAY ORGANIZED: This quart clear zip top toiletry bag is transparent , made of premiere clear material, portable to hold all your travel sized kit when you are on airplane, perfect for keeping your shampoo and conditioner, cosmetics, small toiletries, and liquids in one place.
  • 💧Durable, Leakproof – The quart clear toiletry bag is made from clear durable material, reinforced with stitches to last for ages. and the small bottles in travel toiletries holder are made of plastic and one of these travel bottles kit is made of squzzable silcone, which are reusable and leak proof.
  • 🎁 STYLISH GIFT – This to go travel kit is ideal for carry-on luggage, travel, business trips, gym, camping, picnic, beach, cosmetics.Stylish and compact design of containers toiletry holder suits well for women men of all ages.
No. 18
MANSCAPED® 2 In 1 Shampoo & Conditioner, UltraPremium Formula Infused with Sea Kelp, Coconut Water, Aloe for Nourishing and Hydrating Hair (16 oz)
504 Consomer Reviews
MANSCAPED® 2 In 1 Shampoo & Conditioner, UltraPremium Formula Infused with Sea Kelp, Coconut Water, Aloe for Nourishing and Hydrating Hair (16 oz)
  • 2 IN 1 SHAMPOO & CONDITIONER: Our UltraPremium 2-In-1 Shampoo + Conditioner cleanses and nourishes in just one step. With coconut water, green tea, aloe, turmeric, and sage, this non-greasy daily nourishing formula is naturally hydrating and rich in antioxidants to revitalize the look and feel of your hair.
  • HOW TO USE: Hop in the shower, get a good soak. Apply a generous amount to your hair and lather up. Massage your scalp while singing your favorite song (debatably the most crucial step). And rinse thoroughly.
  • MADE FOR MEN: For the jack-of-all-trades, master of efficiency who wants to cut their shower time in half, this one-and-done duo was made just for you. Our 2-in-1 Shampoo + Conditioner is full of natural hydrators that lock in your hair’s natural moisture. No more bed head or bad hair days or being inconvenienced by long showers that aren’t by choice.
  • DUAL-ACTION FORMULA: With the perfect balance of cleansing and moisturizing, this formula will keep your locks looking lustrous. Made with authentic Refined cologne, step out of the shower smelling like light citrus, a hint of sambac jasmine, vetiver, and light woods.
  • INGREDIENTS: Our UltraPremium 2-In-1 Shampoo + Conditioner is infused with ingredients like sea kelp, coconut water, saw palmetto, aloe, green tea, turmeric, and sage to provide multiple benefits in just one bottle.
No. 19
DOVE MEN + CARE 2 in 1 Shampoo & Conditioner Eucalyptus & Birch 4 Count For Healthy-Looking Hair Naturally Derived Plant Based Cleansers 12 oz
  • Designed for men seeking for naturally derived & sustainable shampoo
  • This best men’s shampoo is 90% naturally derived, with plant-based cleansers
  • Dove Men most natural 2 in 1 Shampoo and Conditioner cleans & revitalize for healthy hair
  • This 2 in 1 Shampoo & Conditioner is enriched with revitalizing Eucalyptus and crispy Pine & Birch scents
  • Hair care for stronger, healthy hair every day
  • 100% recycled & recyclable plastic bottle. Cruelty-free shampoo. Globally, Dove does not test on animals
No. 20
Viking Revolution Spiced Vanilla Mens Shampoo and Conditioner Set with Biotin and Jojoba Oil - Natural Hair Shampoo and Hair Conditioner for Men with Vitamin B5 - Mens Shampoo for Thinning Hair (17Oz)
  • No Itching or Irritation: With the Spiced Vanilla Men's Shampoo and Conditioner, say goodbye to itchy irritated skin and get rid of dandruff. Wash and condition your hair, and look and feel great.
  • Spiced Vanilla Scent: This shampoo and conditioner set is made with excellent quality Jojoba and Olive oil to give you the deepest moisturization and leave your hair smelling great and feeling an unmatched freshness in every shower.
  • Mens Shampoo for Thinning Hair - Our natural biotin shampoo and conditioner set also has a powerful ingredient to fight back thinning and loosing hair: Biotin. Our biotin shampoo and conditioner set is formulated to work in all types of hair and be color safe, while promoting fresh and clean hair.
  • Easy to Use Pump - When connecting the pump to our mens body wash bottle, make sure that the pump is tightly screwed onto the bottle. Turn the spout counterclockwise, a few rotations, and the dispenser will pop open. In just a few pumps, you will have the best shower of your life!
  • The Viking Promise: If for any reason, you’re not completely satisfied, simply contact us, and we’ll take care of it.

How to choose a good men shampoos

Does the idea of finding a fantastic men shampoos make you anxious? When it comes to purchasing this product, specifically when deciding which model to select, has your head been spinning between options? You are not alone if that is the case. We are aware of the pressure involved in the purchasing process!

Your presence here indicates that you are interested in men shampoos. Before choosing which product would be the best for your needs after being inundated with information, locate a reliable source with genuine selections. You can get that information from a variety of sources, including buying guides and rating websites, word-of-mouth recommendations from friends and family, online discussion forums where users can share their own experiences, product reviews that can be found all over the internet, and YouTube channels. You can only get the right product through exhaustive analysis. But you realize that’s not always simple. In order to ease your concerns, we have taken the time to develop a list of the top men shampoos products available right now. You might be wondering how we came up with the list. How was this buying guide developed?

First, we used our algorithms to gather as much reliable data as we could about these products. To verify all the data gathered, we used both artificial intelligence and a lot of algorithms.
Then, our experts used criteria that are recognized in the business to evaluate them according to their quality to price ratio, allowing us to choose the top men shampoos on the market right now!

The selection of the goods is not arbitrary. Before creating a list, we take into account a number of factors. Below are some of the criteria discussed:

Brand Value: What happens if you choose a dubious brand just because it appears to be a good deal? So the likelihood of receiving a product with a short shelf life increases. That is due to the fact that well-known brands have a reputation to uphold, while others do not. Top men shampoos brands strive to provide some distinctive traits that set them apart from the competition. So, hopefully one or more of the items on our list will be perfect for you.

Features: Useful features are all you need, not tons of them. We consider the important aspects and select the top men shampoos based on those.

Specifications: Numbers always help you measure the quality of a product in a quantitative way. We try to find products with higher specifications, but with the right balance.

Quality: A product’s quality may always be quantified with the aid of numbers. We look for goods with better standards that strike the proper balance. The best quality product that gets highly appreciated and recommended by experienced users.

Customer ratings:  Would it be accurate to suggest that the men shampoos were used by hundreds of customers before you? Superior ratings indicate that many customers had better service.

Customer Reviews: Like ratings,  provide you with accurate and reliable information about the product from genuine customers. Customer ratings are very important to all of us because they contain accurate and reliable information about the customer service we received from several hundred customers.

Seller Rank: This is very intriguing! Not only do you need a good men shampoos, you also need a product with rising sales that is trendy. It accomplishes two goals. First, the expanding user base proves the quality of the product. Second, given that number, producers must be able to offer greater quality and after-sales support.

Value: You get what you pay for, they say, so consider the value. Cheap isn’t always good and expensive isn’t always bad. However, that does not imply that spending a lot of money on a product that is flashy but underwhelming is a good idea. Before adding them to the list, we make an effort to evaluate how much value you can get for your money from your men shampoos.

Durability: Durability and reliability are closely related concepts. You will benefit from a strong and long-lasting men shampoos for months and years to come.

Product availability: Products come and go, and new ones replace the old ones. Most likely, a few new features and required changes were made. What use is it to use a supposedly good product if the maker no longer supports it? We make an effort to highlight products that are current and offered by one or more trustworthy sellers, if not more.

Negative Reviews: Yes, we do take that into account as well! The goods with the majority of bad reviews are filtered out and disregarded when we choose the best-rated one on the market.

These are the standards by which we selected our men shampoos. Do we end our process there? Hell no. The most crucial fact about us that you should be aware of is that we regularly update our website with current and pertinent information. We have one more layer of filtration since we place the greatest importance on reader satisfaction. Please let us know if any product included here is incorrect, irrelevant, subpar, or simply out of date. We always value your opinions, and we’ll work hard to make any necessary corrections to our list in response to them.

Why should you believe us?

There are now thousands of possibilities for these products on Amazon, but choosing the best one can be difficult and time-consuming. And what men shampoos should you purchase in 2022?

This guide is the result of more than 10 years of experience in researching, testing and writing about many topics. Each member of our team is an authority in their area. We read every article we could find online and every consumer review on every retail website for seven hours. Additionally, we discovered a ton of websites that offered helpful resources, including buying tips and thorough information on men shampoos.