How natural hormones differ from normal HRT

BIO-IDENTICAL hormones, also known as ‘natural’ hormones, are a form of HRT used mainly to alleviate the symptoms of the menopause.

They work by boosting levels of hormones such as oestrogen and progesterone, which decline as we age.

Bio-identicals are derived from plants: the oestrogen comes from soy and yam oils; the progesterone from yams.

They have the same chemical structure as human hormones, which is why they are called bio-identical.

According to experts such as Dr Erika Schwartz, this means they are gentler and safer to use. However, others say more evidence is needed.

There are two types of bio-identical products available in Britain. Some are made by drug companies and provide a standard dose; these can be prescribed by your GP. You can also get prescriptions for bio-identical products that are mixed specially for you by so- called ‘ compounding’ pharmacies. T hese are available only via a private doctor or clinic.

Critics suggest ‘compounded’ hormones are expensive and unnecessary.

The oestrogen used in most conventional hormone replacement therapy is derived from pregnant mares’ urine; the progesterone is created in a laboratory.

These synthetic hormones are similar to our own, but do not have t he same chemical structure.

This is why they may cause side-effects, such as bloating and mood swings, suggest proponents of natural HRT.

Mostly in Britain, women are prescribed synthetic HRT.