Bio-identical Hormones

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07 Dec Bio-identical Hormones

Bio-identical Hormones: WHAT YOU NEED TO KNOW

There seems to be a lot of confusion around the definition of “natural” versus “bio-identical versus “synthetic” hormones. One thing to remember when making this distinction is that “bio-identical” refers to the shape of the molecule itself rather than the source of the hormone. By this, I mean that hormones can be marketed as “natural” or “plant-based,” yet not come near to being “bio-identical” to native human female hormones or performing as such in the body. Examples of this are the numerous proprietary HRT options being marketed as “plant-based” and “natural,” as well as purely yam-based creams.

Our bodies are literally swimming in hormones that act somewhat analogous to keys in a lock, or pieces to a puzzle. Though this analogy presents a less than complete picture, it can be helpful toward a basic understanding of their action. The puzzle to which I refer makes up the big picture of who we are as human beings and how we operate. When we take in hormonal replacement therapy that doesn’t fit the original design that our cells have evolved to recognize, the end result simply may not feel or act quite right. Hence all those side effects, ranging from annoying and uncomfortable to downright dangerous.

Many pharmaceutical companies are capitalizing on women’s quest for “natural” hormone replacement therapy by marketing proprietary hormone products that are “plant-based.” Yes, many of these hormonal molecules may have been derived from plant sources, but no, the molecules themselves do not always match those found in human females. Moreover, they are often not effectively converted or used in the body and sometimes have actions that are more deleterious than the symptoms they purport to quell or stave off.

Our hormones are comprised of a solid steroid base (yes—cholesterol!), decorated with “arms,” “legs,” and “tails” pinned on here and there. These attachments are what turn hormones into specialized molecules, allowing them to plug in to receptor molecules throughout the body, turning on and off much of the cellular behavior that makes us tick.

Pretty slick! Bio-identical hormones are those whose biochemical structure exactly duplicates those found “naturally” in the human body—that is, the ones whose structure has evolved for millenia. Why mess with a good thing?

True Natural Hormones

The molecules naturally produced in the human female body for which we most often seek replacement include the following: a) the three basic types of estrogen: estrone (E1), estradiol (E2), and estriol (E3); b) progesterone; c) testosterone and d) DHEA, an adrenal precursor to testosterone. These truly “natural” hormones are available by prescription (or, in the case of progesterone and DHEA in the U.S., over-the-counter in low doses), and can also be readily titrated to a woman’s individual needs. Though many health care practitioners are still not trained in prescribing them, the opportunity is there for them to learn, and health care providers are becoming increasingly aware of their patients’ preferences.

Bear in mind that most of the mainstream studies have been performed on conventional HRT. In addition, pharmaceutical companies cannot take out a patent on what the majority of human women make effortlessly on a daily basis and, therefore, cannot generate large sums of money by packaging and selling them. This may explain why women are commonly offered prescriptions for non bio-identical forms of HRT, while their efforts to obtain a prescription for bio-identical HRT can be met with varying degrees of skepticism. On the other hand, unique delivery systems for HRT are patentable, and for this reason options for HRT delivered via transdermal skin patches abound, some of which are bio-identical. Examples include many of the estrogen patches, including Vivelle, Estraderm, and Climara.

Most women know that Premarin, Prempro, and Provera are not bio-identical. Dr. Joel Hargrove says, “Premarin is a natural hormone—if your native food is hay!” (It’s made from conjugated mare urine.) Provera was developed as a substitute for bio-identical progesterone (the kind found in the human female body) because you cannot patent a naturally-occurring hormone. Prempro is a combination of Premarin and Provera.

If you are in doubt as to whether a particular product offered to you by prescription is natural, check the label—if it lists anything other than the above ingredients, including “esterified estrogens,” “progestins,” or “progestogens,” the product is essentially not bio-identical. You can also look the product up in the most up-to-date Physician’s Desk Reference or product monograph, many proprietary products also have their own site.

Many patients over the years have expressed their confusion to me about the use of progesterone creams, particularly regarding the efficacy of yam-based or other plant-based creams. Wild yam (Dioscorea barbasco) cannot be converted into progesterone in the body.

The conversion can occur in a laboratory setting, however, and therefore, wild yam is sometimes used to synthesize the progesterone found in progesterone creams. The cream may technically be yam-based, but its active ingredient is not the wild yam itself but the USP progesterone that has been added. Results of research on oral and topical applications of wild yam extract have not detected a significant change in progesterone levels in the blood.

If you want the beneficial effects of bio-identical progesterone, make sure the ingredients on the label include United States Pharmacopoeia (U.S.P.) progesterone. U.S.P. progesterone is available in over-the-counter 2% creams (in the U.S.) as well as by prescription.

Here are the salient points to know:

  • Our native human hormones can be synthesized in laboratories to exactly duplicate those found in our bodies.
  • Bio-identical hormone therapy has been prescribed by doctors for many years and is readily available through formulary pharmacies.
  • Bio-identical hormone therapy is easily titrated to suit women’s individual needs, is readily absorbed and utilized, and effective.
  • Bio-identical hormones are the ones we want to use as replacement therapy, if and when we decide they are necessary.

If you’re searching for a comprehensive evaluation of your unique hormone needs and feel natural medicine may be of benefit, feel free to book an appointment, I’d love to help you.



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