Hi Berto
as Dotty says - ALL HRT patches contain bio-identical oestrogen, including estraderm. All bio-identical oestrogens are synthetic in the sense that they are manufactured in a lab in a pure form, from other raw ingredients and bear no resemblance to the raw ingredients used. The HRT pharmaceutical companies will all buy in the synthesised, pure estradiol (to all intents and purposes a "chemical" powder or crystals) from a company that manufactures it from the raw ingredients - yams or soy I think?
Fear not, that site you quoted does not say Estraderm is not bio-identical. If you look at the wording, it just gives examples of some that are! ("includes" is the word that gives this away!).
If you want the complete list of patches then best look at a site like this one - here they are:
https://www.menopausematters.co.uk/treatafter.phpScroll down for patches.
I have used Estraderm and now on Evorel, originally on Estradot. Estradot are tiny, Estraderm are HUGE. Personally I didn't get on with them due to the sixe and it was like having a polythene bag stuck to my butt!! I'm very happily settled on Evorel and yes you can ask for that if it is your preference though if youve already got the prescrption from the chemist then by all means use them but ask for Evorel next time?
Hope this helps
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Hurdity x