Friends, family members and even strangers often turn to me for advice on how to grow hair longer and stronger. Many are searching for miracle oils or leave-in treatments, but one of the most effective changes often starts at the very beginning of a hair routine: shampoo. While it may seem like a minor step, switching to a targeted formula such as Redken’s Extreme Length Shampoo can have a noticeable impact.
Redken’s Extreme Length range includes four products — a shampoo, conditioner, leave-in conditioner and treatment mask. While each product is designed to support hair growth and strength, the shampoo stands out as the most popular option, boasting more than 7,000 five-star reviews. For shoppers choosing just one product from the line, the shampoo is widely considered the best place to start.
The core goal of Redken Extreme Length Shampoo is to support healthier hair growth, a claim many users say it delivers on. The formula features key ingredients including salicylic acid, citric acid and biotin. Salicylic acid and citric acid belong to the BHA and AHA families of chemical exfoliants, which help gently exfoliate the scalp.
This process can boost circulation, remove product buildup and reduce excess oil — all factors that contribute to a healthier scalp environment and stronger hair strands. Biotin, while debated in terms of its effectiveness, is generally considered safe and supportive of overall hair health.
Customer reviews highlight striking results. One shopper reported their hair “grew eight inches” after a year of consistent use, while several others noted visible gains of multiple inches. A user in their 50s said hair that had been receding at their temples began to grow back, and a 47-year-old reviewer claimed they “did not lose a single strand of hair” during showers after switching to the shampoo. Another customer described seeing “significant hair growth in five months.”
Redken Extreme Length Shampoo is available through Amazon, where it continues to attract strong reviews. For those looking to maximize results, shoppers may also consider pairing it with other products from the Extreme Length line for added support.
