If you've been noticing your hair feels thinner, weaker, or just not as full as it used to, you're not alone. Hair changes over time. Hormones, stress, heat styling, color treatments, and even just aging can all affect thickness and strength.
From the brand that champions Advanced pH Science comes the new Acidic Grow Full System. Redken's density & strength system, formulated with with Azelaic Acid plus Caffeine and Prebiotics, instantly provides fuller and thicker looking hair, a healthy feeling and rebalanced scalp.
Who it's for
- Thinning or fine hair
- Breakage from heat styling or color treatments
- Hair that feels weaker or more fragile than it used to
- A desire for fuller, healthier-looking hair
These products are formulated with Redken's Densifying Complex including caffeine which supports the look and feel of denser hair and prebiotics which rebalance the scalp with moisture, plus azelaic acid which supports scalp health.
What Makes It Different
The Acidic Grow Full system is designed to strengthen hair from the inside out while creating the ideal environment for healthier growth by supporting scalp health.
It uses acidic bonding technology to help fortify weakened strands and reduce breakage. When your hair is stronger, you keep more length and fullness.
The system also includes ingredients that support the scalp, because healthy hair starts at the root.
What's Included
The Acidic Grow Full system includes:
- Shampoo to cleanse and prepare the scalp
- Conditioner to strengthen and detangle
- Scalp & Hair Serum works with the shampoo and conditioner to support growth and reduce breakage providing strength to the hair fiber
- Instant Densifying Spray is a lightweight leave-in treatment spray formulated with 5% Densifying Complex that delivers instant fullness and root lift while protecting hair from heat styling up to 450°F.
Try It at Signature Salon & Spa 20% Off!
We're introducing the Acidic Grow Full system at 20% off through March 28. It's a great time to start if you've been thinking about a growth-focused routine.
Promotion valid March 9–28, 2026. No stacking offers. Rain checks available.