We independently evaluate all recommended products and services. If you click on links we provide, we may receive compensation. Learn more. Beauty Hair Amazon Shoppers Love This Hair Shampoo for Growth — and It's 30% Off It’s a “must-have for thinning hair.” By Kayla Hui Kayla Hui Kayla Hui is an eCommerce writer at Meredith Corporation, covering all things health, wellness, and beauty. Her work appears in Travel+Leisure, Reader’s Digest UK, Matador Network, Well+Good, Verywell Health, Shape, Health, PEOPLE, Pulitzer Center, Toward Freedom, Inverse, Healthline, BRIDES, and more. Kayla graduated from the Boston University School of Public Health and currently lives in New York City. During her free time, Kayla enjoys reading, trying new restaurants, and buying plants she doesn't need. Shape's editorial guidelines Updated on November 28, 2021 Photo: Getty Images It's completely normal to lose between 50 and 100 hairs a day. However, when hair loss exceeds that amount, it can be a cause of concern, especially when it's a result of stress, illness, or lifestyle changes. While attempting to control stress levels and lifestyle factors can help, these actions aren't always enough and can require more intervention. That's why Amazon shoppers are incorporating this hair growth shampoo (Buy It, $35, was $45, amazon.com) as a part of their daily hair care regimen. And luckily, it's 30 percent off with an onsite coupon through December 5. Shapiro MD Hair Loss Shampoo was designed to achieve fuller and thicker hair thanks to the formula which consists of saw palmetto and caffeine. While hair growth generation is still being studied, a growing body of evidence shows that these ingredients improve hair growth and appearance. For example, a research study found that saw palmetto increased hair count by nearly 12 percent among study participants after four months of treatment. ( These Hair Growth Treatments Are All Over TikTok — Are They Worth Trying? "There is some evidence to show that palmetto berries can help hair growth via hormonal pathways in the skin," says Rachel Nazarian, M.D., FAAD, a board-certified dermatologist based in New York. Other research studies suggest caffeine can stimulate hair follicle growth through penetration of the skin's barrier and counteract androgenetic alopecia, a condition that causes hair follicles to decrease over time, leading to baldness in men. What's more, the shampoo is sulfate-, cruelty-, paraben-free so you can enjoy a shampoo without any toxic chemicals. Amazon Buy It: Shapiro MD Hair Loss Shampoo, $35, was $45, amazon.com According to Amazon shoppers, this shampoo is a "must-have for thinning hair." One said: "I'm going through chemotherapy and also using testosterone, thus causing my hair to thin. This product does wonders for my thinning hair and regrowth." Even a dubious customer was impressed by their results: "I was skeptical at first, but so far I'd say I'm pleased. I've tried tons of other products and [this] one has been one of the good ones. I had some patches in front that stubbornly refused to grow hair low and behold hair is growing there now." "I bought the first bottle a year ago and there is no other shampoo I have tried that gives me good results," an Amazon shopper raved. Another reviewer wrote, "I originally bought this shampoo for my husband's thinning hair and he absolutely loves it! His hair is so much thicker and much softer." Normally $45 for the bottle, Shapiro MD Hair Loss Shampoo is now available for $35. Don't miss your chance to restore thick and healthy hair. Was this page helpful? Thanks for your feedback! Tell us why! Other Submit Shop More Shape-Approved Picks Lululemon, Spanx, and Vegamour Secretly Dropped Prices Up to 70% on Shopper-Loved Finds Can’t Poop? Shoppers Say This $20 Constipation-Relieving Tool Helps Them Go ‘Quickly and Painlessly’ Shoppers Walk 20,000+ Steps a Day In These Comfy Sneakers from a Martha Stewart-Worn Brand