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Hello.

Thank you for all the interesting replies I've received! It's difficult to
sum it it up but I'll try:

Most people wrote that shampoos are no problem unless you are DH.

A few people wrote that gluten from a shampoo could go through the skull and
into the body.

Most people wrote that things you don't swallow can hurt you, BUT that you
have to be careful with toothpaste (since you can accidently swallow it) and
lip gloss (since you have it on your lips a long time and you lick your
lips).

Thank you all!

Ragnar