- Firstly, use a gum such as xanthan gum, it is completely natural. I cover how in this blog:
What Is Xanthan Gum? How Do I Thicken A DIY Shampoo With It?
- Secondly, use a liquid thickener such as crothix. I could not find it in the UK so I imported it from the US. I found it at a place called the herbarie. I demonstrate me using it in the video below.
I used to use xanthan gum but it can be hard to work with so I upgraded to crothix.
Your shampoo should have a pH between 5.5 and 6.0. To achieve this use citric acid. Add 0.5% (0.5g for a 100g recipe) at a time until you reach your desired pH. Citric acid is very widely available because it's used commercially to adjust the pH of food and cosmetics.
How To Adjust Shampoo pH With Citiric
How To Make A Shampoo Thicker: Xanthan Gum vs. Crothix Vs. Salt
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