Shampoo · Redken

Redken Acidic Grow Full System Densifying Shampoo for Thin Hair, Strengthens & Thickens 300ml

£27.50 at Boots
4.6 / 5
★★★★★★★★★★
179 reviews across 1 retailer
91% rate it 4 or 5 stars
5★
126
4★
37
3★
14
2★
2
1★
0
Boots4.60★★★★★★★★★★179 reviews

Summary. Reviewers are very positive: 91% give it 4 or 5 stars.

+Positives

  • Scent. Reviewers often single out how it smells. 88 reviews
  • Volume. Hair looks fuller, with more body. 81 reviews
  • Clean feel. Leaves hair and scalp feeling properly clean. 77 reviews
  • Lather. Foams up readily, so each wash needs only a little product. 58 reviews
  • Softness. Hair is described as softer and smoother afterwards. 48 reviews

−Negatives

  • Can be drying. Some find it leaves hair dry, rough or stripped. 6 reviews
  • Residue. Some say it leaves hair greasy, heavy or coated. 5 reviews
Last 12 months: 4.6 from 179 reviews, in line with the all-time score.

Reviews from 1 Jun 2026 to 18 Aug 2026.