In my previous article I explained the overwhelming health benefits shown in the peer-reviewed scientific literature of using transdermal bio-identical estrogen and progesterone replacement therapy. In this article I’ll explain some important details of estrogen dosing and monitoring. Let me point out how to find a practitioner who understands and prescribes BHRT.
Estrogen replacement methods
There are several ways to replace low estrogen. Most importantly, it is administered via your skin somewhere, and not swallowed. You may recall, taking even natural estrogen by mouth carries some health risks. When you swallow estrogen, it is absorbed by your intestines and passes immediately via the portal vein to your liver for detoxification. It’s the unnatural metabolites of this that we worry about.
However, with creams and troches (mouth lozenges), it absorbs directly into your blood stream and then directly to your target organs needing replacement.
If sometimes get a request for vaginal transdermal estrogen to build up tissue atrophy and reverse dryness. This can be done with both estrogen and testosterone. These hormones applied to genitalia will have some systemic absorption too, and must be taken into account (if used consistently) when interpreting lab test values.
Reasons to add progesterone
Estrogen is usually taken along with progesterone in order to lower the otherwise increased risk of uterine cancer.[i] As a quick aside, the other risk factors for endometrial (uterine) cancer includes nulliparity (never been pregnant), early menarche, late menopause, polycystic ovarian syndrome, obesity since just adulthood, tamoxifen use, and a first-degree relative with uterine cancer.
Estrogen dosing can be tricky
The usual effective dose of an estrogen cream for menopausal symptoms is 1 to 5 mg daily. If there are no symptoms to reverse, then lower doses will usually work to bring estradiol blood levels back into the range of a 30-year-old woman (the goal). As with medication, less is best.
Now the tricky part. Estrogen should be given as Biest (estradiol or E2 + estriol or E3). The ration I use is from half of each, to E3 80% + E2 20%. This is effectively a 1:1 ratio or 4:1 ratio.
The timing of dosing is slightly trickier. For women who still have monthly periods, you can apply it days 5-25 of your menstrual cycle. This mimics the natural estrogen level rise during these days, and avoids too much estrogen on days when it is usually low.
Better yet is if you are menopausal. If this is the case, then you don’t have periods, which makes it even easier. Simply apply estrogen and progesterone daily in a continuous fashion, rotating application sites to avoid skin sensitivity. Then, simply take a 3-5 day break every 3 months. These two medicines are usually put into one cream or troche for menopausal women.
Important lab testing
Your doctor who manages hormone replacement will know the tests that need to be drawn to monitor your hormone levels. The easiest are taken from your blood. Saliva testing is another reliable method to follow your levels, but require specialty labs such as Access Medical Labs or Genova Diagnostics.
The normal ranges for estradiol and progesterone are quite, and minor dose adjustments seem to still keep levels in the youthful range. Therefore, I often make large dose adjustments (increases by 50%-100%) if needed to block symptoms of menopause.
Here are the important labs related to estrogen and progesterone replacement. They should be drawn as needed—yearly at a minimum.
LH (Luteinizing Hormone) – only once
FSH (Follicle Stimulating Hormone) – only once
TSH (thyroid stimulating hormone)
How to find a practitioner who prescribes BHRT
There are relatively few doctors who have taken the extra training and know how to manage bio-identical hormone therapy (BHRT). Finding one in your area may not be so easy. However, here is a link to a search engine for physicians who are trained in this:
All doctors I am aware of in my city of San Diego, CA do not accept insurance payments for such visits. One patient I met last week reported he was paying $200 per month for his testosterone replacement management. This included visits with the nurse, lab tests, and the medicine. They required lab testing every 3 months, but I think that is far too excessive once the medicine dosages and hormone blood levels are fairly stabilized.
You don’t need to pay nearly that much for hormone management! I’ve decided recently to provide this service to Californians—over the internet or phone. Stay tuned to my final article on hormone replacement therapy to come.
To optimal hormone balance for feeling good,
Michael Cutler, M.D.