Beauty Hair This $8 Shampoo Makes Hair Grow 'Faster Than Ever Before,' According to Amazon Shoppers It’s infused with caffeine to make your hair longer, thicker, and shinier. By Caroline Harris Caroline Harris Caroline Harris is San Francisco-based writer, editor, and environmental activist. She currently is an Editorial Associate at the San Francisco Museum of Modern Art. InStyle's editorial guidelines Published on March 4, 2021 @ 10:00PM Pin Share Tweet Email We independently research, test, review, and recommend the best products—learn more about our process. If you buy something through our links, we may earn a commission. Photo: Courtesy Many people have been struggling with hair loss since the coronavirus pandemic started almost a year ago. A December 2020 study published in the Journal of the American Academy of Dermatology found a 400 percent increase in hair shedding in New York City patients visiting dermatology clinics, especially among the Hispanic and Latinx population, this past summer. Last month, The New York Times reported on a surge in stress-related hair loss among adults. The problem has hit Hollywood, too: Actress Alyssa Milano uploaded a video in August 2020 demonstrating how much of her hair falls out while using a detangler brush after showering. So if you've noticed that your hair looks sparser than usual lately, it's not just you. Fortunately, biotin shampoo may be able to help by strengthening strands to encourage growth over time. "Biotin helps nourish the hair follicles and stimulate the growth of existing hair," board-certified dermatologist Dr. Debra Jaliman, MD, previously told InStyle. If you want to give it a try, Amazon shoppers recommend the $8 Marc Anthony Grow Long Biotin Shampoo for reviving dry, brittle, and damaged hair in as little as two weeks. "My hair is growing back faster than ever before, and being restored to healthy, too," one said, while another said their hair "has never looked or felt better." In addition to biotin, the affordable shampoo is formulated with caffeine, ginseng, keratin, grapeseed oil, and vitamin E. This powerful, sulfate-free blend is designed to prevent breakage, combat split ends, and leave hair feeling both softer and stronger with every wash. Sure enough, the hair growth shampoo — which one shopper said "halts shedding" — has earned over 3,400 five-star ratings on Amazon and is a best-seller. Courtesy Shop now: $8; amazon.com "After using this shampoo, my hair is fuller, softer, bouncier, and growing fast," a reviewer wrote. "I got complimented about my hair by two older women at the grocery store the other day, so that validated for me that this product definitely works." Those with bleached, over-processed strands are calling the shampoo a "miracle" that's made their hair much smoother and more manageable, while others claim their brittle hair was "falling out terribly" until they discovered the popular treatment. The rave reviews include testimonials from both men and women who can't get enough (some even go as far as saying they'll "never use another shampoo again"). The hair growth shampoo only costs $8, but has been called "salon-quality" because of how effectively it rejuvenates limp, lifeless strands into fuller, healthier-looking hair over time. Shop the Marc Anthony Grow Long Biotin Shampoo on Amazon today to see for yourself why so many others are buying it again and again.