Haha! I'm assuming it is the coolness that helps and cabbage leaf because it's the right shape to cup nicely round boobs
Re herbal remedies and HRT - it is some of the herbal preparations notably phyto-oestrogens that can interact with oestrogen and other receptors, so are not recommended to mix with HRT - particuarly St John's Wort. EPO is a plant-derived oil supplement - containing one of the Omega group of fatty acids - so I would say just like taking cod liver oil in a sense - so not to worry about any interference.
EPO was prescribed on NHS in the past (I was prescribed it many years ago for breast pain) but was removed from NICE approval due to insufficient data reagrding efficacy. I did take it but I can't say whether it worked or not!
Hurdity x