Peptide Prep Detox Shampoo — Reddit Reviews
by K18
Updated November 5, 2026
Salicylic acid clarifier tackles buildup and hard-water residue; scalp irritation is common.
What the community says
A strong clarifying shampoo with salicylic acid, charcoal powder, and SH-Oligopeptide-78 for periodic buildup removal. It suits fine or high-porosity hair dealing with hard-water deposits, but sensitive scalps may itch, flake, or feel stripped afterward.
What this means for you
What people love
- Salicylic acid clarifies scalp buildup
- Cuts through hard-water residue
- Leaves fine hair clean without straw texture
Watch out for
- Too strong for sensitive scalps; itching, flaking, soreness, and shedding show up
- Strips toner and dries highlighted lengths
- Can leave hair flat or film-coated
Product details
Concerns
Use caution
Key Ingredients
Hair Type
How to use it
From Reddit routinesHow Reddit uses it
Where to buy
Real Reddit threads — 87 mentions across 30 threads
K18 Peptide Prep Detox Shampoo on Reddit, in one place — 30 threads from r/Haircare, r/curlyhair and 6 more, summarized.
“I start off with a detox shampoo (currently the K18 as I have t on hand)”
Mentioned
“I forgot to put on that i use k18 detox shampoo when I do the bond treatment every 4 weeks.”
Mentioned
“As its also a chleating shampoo I founds its helped with the hard water in my area.”
Mentioned
“Once a week use the K18 detox shampoo and follow it up with the Ouai hair mask.”
Mentioned
“I had K18 shampoo and conditioner in my Amazon cart.”
Mentioned
“Not anymore.”
Mentioned
“It is too hard to tell whether you’re dealing with a third party seller or a brand page.”
Mentioned
“The peptide prep detox shampoo is very strong, too strong for my scalp.”
Cautionary
“The shampoo and conditioner were meh for me, didn't compare to the redken all soft”
Cautionary
“Has anyone tried K18 shampoo/conditioner?”
Mentioned
