“Replacing the oestrogen that your body is no longer producing with the versions found in conventional HRT is like replacing parts designed for a Chevvy with those made for a Mercedes,” says Dr Jonathan Wright, Medical Director of Tahoma Clinic in Washington USA, and a long-time advocate of what are known as bio-identical hormones. “They may be roughly the same, but with both engine parts and biology, very precise measurements matter.”
The idea of bio-identical hormones has been attracting a lot of attention in America, especially since actress Suzanne Somers, previously best known for her role as a ditzy blonde in the 1980s sitcom hit Three's Company, published a best-seller on their benefits.(3) However claims that they are safer or more effective has been dismissed as “marketing” by the American drugs authority, the FDA.
Here in the UK, the situation is typically much more low-key. There’s been far less publicity about them, although a small but growing number of women have been taking them. Several brands are available on the NHS, however most GPs are reluctant to prescribe them, saying there is no evidence they work. So what exactly does it mean to say that a hormone is bio-identical? A regular HRT pill contains oestrogen – the hormone that promotes growth so it’s good for skin and hair, lifts depression, controls hot flashes – along with progesterone, the hormone that’s produced to prepare your body for pregnancy.
Not all oestrogens are equal
Just to complicate matters oestrogen in the body comes in three varieties – oestrodial, oestrone and oestriol. Not only that but they come in very different proportions. Oestriol is the weakest and pre-menopausal women normally have lots of it; it makes up about 90 per cent of the total amount. The next most abundant is oestradiol, the most potent one, at around 7 per cent, followed by oestrone at 3 per cent. But in regular HRT, the oestrogen part doesn’t come in anything like those proportions. One of the most common brands is one called Premarin which actually comes from the urine of pregnant mares. Not only are the proportions very different but it also contains extra horse oestrogens. Oestrone shoots up from being the least to the most abundant at 75 per ......
MEMBERS have free access to 100's of Reports, a monthly 100% Health Newsletter, free use of the 100% Health programme with unlimited reassessments and big discounts, up to 30% off books, supplements and foods at HOLFORDirect.com.
Find out more