All of the HRT we prescribe is regulated and the oestrogen and progesterone is usually available on the NHS. We don't prescribe compounded bioidentical HRT. Here's a quick explanation of both: Regulated bioidentical hormones (rBHRT) - These are derived from plants and are available on a standard, regulated prescription - they can be prescribed by our clinic or your GP/specialist in the NHS. Compounded bioidentical hormones (cBHRT) - These are made by private clinics in a process known as compounding. Compounded bioidentical hormones are not regulated and not available on the NHS. They are marketed as precise duplicates of the hormones from your ovaries, after blood test analysis. The hormone combination is then made up by a private pharmacy. These combinations do not follow the same regulations as conventional HRT and haven't been through the same strict testing processes for effectiveness and safety. The blood tests and hormones are also very expensive - significantly more than the cost of private or NHS prescriptions. More expensive does not mean better. We don't prescribe these.