A nurse selling MLM products to a patient?

[Splats]

Someone I know on FB is a nurse, they do private support work for a child patient (under 10) with high medical needs (and also still work for NHS)

She (my FB friend) sells temple spa on the side.

Patients mum is now doing Facebook posts about how a temple spa product gives her young daughter beautiful skin (and tagging my FB friends temple spa business)

It doesn't feel right to me but I am not sure what the rules are ?

I think any site where people never disagreed would be a very insincere one

Maybe there is no charge involved.

I agree it's crossing a massive boundary. I have a friend whose GP of all people was selling DoTerra essential oils in surgery.
MLM or not, someone who has responsibility for someone else's heathcare is in a position of responsibility, and they are exploiting that relationship if they are then selling things on the side to their patients.
Whilst it doesn't matter what the product is, the likelihood of it being MLM is always going to be high as the reps are always "encouraged" to sell to literally anyone and everyone they know.