From the NHS website and for anyone else who might be confused by some posts here.
"Vaginal oestrogen-Brand names: Vagifem, Gina, Ovestin, Vagirux
Vaginal oestrogen is a hormone replacement therapy (HRT) medicine that contains the hormone oestrogen. It's used to treat the vaginal dryness and irritation that can happen during the menopause".
You are correct, Jules. Any estrogen is of course hormone replacement therapy.