Shampoo · Redken

REDKEN Extreme Length Shampoo Biotin, For Longer Stronger Hair 300ml

£23.50 at Boots
Only 3 reviews so far, which is too few for a reliable score.
Boots–3 reviews

Summary. The 3 reviews so far average 3.7 stars. Treat this as an early read.

+Positives

  • Growth. Some longer-term users feel their hair is growing better. 2 reviews

−Negatives

No complaints mentioned in the written reviews so far.

Reviews from 7 May 2024 to 4 Jan 2026.