What is GLP-1

Key Takeaways

• GLP-1 medications mimic a natural gut hormone that tells your brain you're full, helping regulate blood sugar and reduce appetite — originally developed for type 2 diabetes and now widely used for weight management.
• Rapid weight loss from GLP-1 use can trigger temporary hair thinning — metabolic stress and sudden changes in nutrition can disrupt the hair growth cycle, leading to breakage and reduced fullness.
• The Redken Acidic Grow Full System is a 4-step routine — Shampoo, Conditioner, Serum, and Densifying Spray — designed to reduce breakage and support fuller, denser-looking hair for GLP-1 users experiencing hair loss.

GLP-1 stands for Glucagon-like Peptide-1. It's a natural hormone your body already makes — your gut releases it every time you eat. Its job is simple: tell your brain you're full and help your body manage blood sugar levels. GLP-1 medications mimic that natural hormone.

GLP-1 work by:

Making you feel full faster — so you naturally eat less
Keeping you satisfied longer — reducing the urge to snack or overeat
Quieting food noise — the constant mental preoccupation with eating that many people experience
They were originally developed to treat type 2 diabetes but are now widely prescribed for weight management.

What exactly is a leave-in hair treatment?

At its core, a leave-in conditioner or leave-in product is formulated to remain on your strands until your next wash. Unlike traditional rinse-out conditioners that primarily focus on immediate detangling and surface smoothing in the shower, leave-in formulas provide ongoing benefits. They act as a protective shield against environmental stressors, lock in instant moisture, and often provide heat protection before styling.

Because they are lightweight, these formulas absorb seamlessly into the hair fiber without leaving a heavy or greasy residue. Whether you are dealing with chemical damage, mechanical wear and tear, or simply want to boost your hair's natural shine, a dedicated hair treatment is your first line of defense.

How to choose the right formula for your hair concerns

With so many options available, selecting the ideal product comes down to understanding what your hair needs. To help you decide which Redken leave-in treatment belongs in your routine, use this quick reference guide to compare our top leave-in treatments:

How to use leave-in treatment for maximum benefits

Applying your products correctly is just as important as choosing the right ones. Follow these simple steps for optimal results:

1. Start with clean, damp hair: Gently squeeze excess water from your hair using a microfiber towel. Your hair should be damp, not soaking wet, to allow the product to absorb properly.
2. Section your hair: For even distribution, divide your hair into manageable sections.
3. Apply the product: Spray or smooth your chosen treatment from the mid-lengths to the ends, where hair tends to be the driest and most prone to damage. Avoid applying heavy creams directly to the roots unless it is a specific scalp serum.
4. Comb through: Use a wide-tooth comb to gently detangle and ensure the product is evenly distributed.
5. Style as usual: Proceed with your regular air-drying or heat-styling routine.



FREQUENTLY ASKED QUESTIONS
Answers to Your Frequently Asked Questions
What is the best leave-in conditioner for damaged hair? ​
The best leave-in conditioner for damaged hair will contain bond-repairing ingredients to strengthen the hair fiber from the inside out. Formulas like the Acidic Bonding Leave-In Conditioner use Citric Acid to reinforce weakened bonds, making it an excellent choice for hair compromised by heat or color processing.
Can I use a leave-in hair care product every day?
Yes, you can use a leave-in treatment daily, especially if you have dry or textured hair that craves constant moisture. Lightweight options like the Acidic Bonding 24/7 Night & Day Serum can be applied to dry hair between wash days to tame frizz and refresh your style without causing buildup.
How do I know if I need a no-rinse conditioner or a deep hair treatment mask?
A no-rinse conditioner is designed for daily or post-wash maintenance to provide ongoing hydration, detangling, and protection. A deep hair treatment mask is a rinse-out product used weekly for intensive, concentrated repair. For the healthiest hair, it is highly beneficial to incorporate both into your routine.
How to use leave-in treatment if I have fine hair?
If you have fine hair, focus the application strictly on the mid-lengths and ends to avoid weighing down your roots. Opt for lightweight sprays like One United, and start with a small amount—you can always add more if your hair needs extra detangling or moisture.




SHOP LEAVE-IN HAIR TREATMENTS





STYLING BEST SELLER
ALL-IN-ONE PRIMER
ONE UNITED
Leave-in Conditioner with 25 Benefits. Prime, Protect & Treat.
Select a Size for ONE UNITED 30 ml 150 ml 400 ml
Old Price New Price $32.00
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BEST SELLER
BOND REPAIR
Acidic Bonding Concentrate 24/7 Night & Day Serum
Bond repair serum that combats daily damage overnight
Select a Size for Acidic Bonding Concentrate 24/7 Night & Day Serum 50 ml / 1.7 fl oz 100 ml / 3.4 fl oz
Old Price New Price $48.00
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NEW
SOFTEN & MOISTURIZE
All Soft Argan-6 Oil
Multi-benefit oil for moisturized, softer hair
Select a Size for All Soft Argan-6 Oil 50 ml / 1.7 fl oz 100 ml / 3.4 fl oz
Old Price New Price $40.00
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NEW
SHINE & COLOR VIBRANCY
Naked Gloss Lightweight Shine Oil
Lightweight hair oil for shine, moisture & color vibrancy
Select a Size for Naked Gloss Lightweight Shine Oil 50 ml / 1.7 fl oz 100 ml / 3.4 fl oz
Old Price New Price $48.00
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NEW
Acidic Grow Full System Scalp & Hair Serum
Densifying scalp & hair serum for thin, flat hair
Select a Size for Acidic Grow Full System Scalp & Hair Serum 45 ml / 1.5 fl oz 100 ml / 3.4 fl oz
Old Price New Price $48.00
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