What % of argan oil to use in shampoo?

[AliOop]

The OP also mentioned getting a CPSR and shows his/her location as Exeter - meaning that s/he is selling in the UK. My understanding is that the UK has pretty strict rules about the pH of shampoos formulated for sale, which rules would eliminate the possibility of lye-based liquid soap being sold as "shampoo."

 

[Zany_in_CO]

What kind of shampoo are you making? Syndet bar or liquid? Or lye based soap shampoo?

My apologies to @violets2217 ! Good for you to ask the key question!

Because when we all started discussing detergent shampoo, the OP went along with it as if it was helpful information.

True. I think that's because, as a Newbie, she didn't know there is a difference. Maybe?