Redken Extreme Length Biotin Shampoo Delivers Stronger, Bouncier Hair

The jumbo-sized shampoo is an incredible value compared to salon-grade options.

Published on Feb. 6, 2026

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New York Post commerce journalist Victoria McDonnell tested the Redken Extreme Length Biotin Shampoo and found it delivered on its promises, providing gentle cleansing, strengthening damaged ends, and adding volume and bounce without weighing hair down. The jumbo 33.8 fl oz bottle, which costs around $56 on Amazon, is an exceptional value compared to many salon-grade shampoos.

Why it matters

With medium-thick hair that struggles with damaged ends, McDonnell was impressed that this shampoo was able to reinforce and add life back into her strands without the typical downsides of strength-focused formulas, making it a smart buy for those with similar hair types.

The details

McDonnell was initially skeptical of the shampoo's claims, but after several weeks of use, she noticed her ends looked more resilient and less frazzled. The formula also provided a subtle boost in volume and bounce, without weighing hair down. A little of the product goes a long way, so the jumbo size should last a long time, justifying the salon-level price point.

  • McDonnell has been testing the shampoo for several weeks.

The players

Victoria McDonnell

A New York Post commerce journalist and content strategist who has spent countless hours researching, testing, and comparing the latest beauty products.

Redken

A professional haircare brand that produces the Extreme Length Biotin Shampoo.

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What they’re saying

“If you've been chasing a shampoo that actually feels like it's strengthening and adding life back into your strands, this Redken Extreme Length Biotin Shampoo is one worth trying.”

— Victoria McDonnell, New York Post Commerce Journalist & Content Strategist (New York Post)

The takeaway

For those with medium-thick hair that struggles with damaged ends, the Redken Extreme Length Biotin Shampoo offers an effective and affordable solution, providing gentle cleansing, strengthening, and volumizing benefits without the typical downsides of strength-focused formulas.