Dienogest is really in a category of it's own when it comes to progestins- it acts directly on the ovaries rather than at the level of the hypothalamic pituitary axis.
It is anti-inflammatory and probably does provide some degree of direct ovarian suppression. It also exists in a combined oral HRT preparation which is not available in the UK.
However as the main point of me being on ovarian suppression is to reduce my risk of familial ovarian cancer as well as syncope reduction through having stable hormone levels and no bleeding, none of the evidence I have seen points to dienogest being as capable as the typical progestins for this, hence it is not for me.
I believe you can buy it as a standalone online from private pharmacies. This is a treatment for endometriosis only, you cannot say it is for contraception (again this points away from reliable ovarian suppression).
What would you like to know about Zoely? My experience of it has been extremely positive - I take take the active pills only and throw away the 4 dummy pills, because the clue's in the name.
I don't even know I am on a pill other than the fact I have no periods and every day hormonally for me is the same 😁