The ZRT Laboratory Blog

The ZRT Blog is an extensive resource for patients and health care providers searching for health and hormone testing information. Here, you can read about ZRT’s cutting edge research, advances in testing, wellness advice, and health industry highlights.

Posted by Dr. Alison McAllister on Wednesday, 11 March 2015

Navigating the Challenges of Hormone Replacement Therapy Dosing

Woman confused by different types of medicineOver 25 million women a year worldwide will enter menopause and make a decision about hormone replacement therapy. For healthcare practitioners, what dosage and what formulation these hormones take is open to debate.

After many years of teaching and talking to practitioners, I’ve learned that: there are many strategies for approaching dosages, everyone thinks that theirs is the best, most of them work well for many patients but not all, and that we really, really need more research.

There is very little to no research on different dosing strategies.

Standard bioidentical hormones have research behind them, but they are looking at serum testing and usually compare themselves to placebos rather than each other. When you look at the doses of some of these products, you can see the large variation all used to treat the same condition.

For instance, in estrogens we have estradiol patches which dose from 0.025mg to 0.1mg a day. At the same time we have Estrasorb™ 4.35mg/packet with 2 packets, commonly used for a total of 8.625mg per day. There is also compounded supplementation at dosages as low as the patches, to one protocol that doses hormones at twice the dose of Estrasorb™ (16mg daily).

How can all of these doses be for the same symptoms? How can they all have the same side effects? How can the manufacturers come up with these doses and why are they so different from each other? The answer lies in the testing methods and the delivery pharmacodynamics.

The testing methods are clear.

If you only test in serum, you will tend to overdose your topical creams. But, because serum tests have been used for most of the research on hormone replacement therapy, you find that most topical creams cite absorption rates of only around 10%, which is frankly, a pretty poor product if it was true.

At ZRT, we believe that absorption rates of most topical creams are closer to 90% or above. However, when you dose topical creams, the delivery is not a steady state delivery, but is instead a “bolus” effect. Topical creams seem to absorb very quickly and release their hormones very quickly. Saliva and bloodspot testing catches these levels rather than show the baseline levels or barely elevated seen in serum values.

We need more research in how topical hormones are being delivered to tissues.

We know that serum, saliva, bloodspot and urine can all tell us different things because we test in all these mediums (serum only for our research clients). But, no one is really looking at how these hormones are passing into the different mediums through the body.

When we compound hormones, we introduce dosages, topical formulations of creams and troches and combinations that have not been well studied. We need to look at not only our dosages, but also the pharmacodynamics of our delivery system, as well as the patient’s lab results in a helpful lab matrix to determine if we are getting the optimal results for our patient.

I’m excited to hear Dr Paul Savage talk about physiological dosing in this webinar. I generally advocate for physiologic dosing trying to get good lab work within range as well as using hormones dosages as close to what the body makes as possible. It will be interesting to hear his take on this topic.

In the meantime – yay for Polonini et al, who actually looked at Biest and progesterone and how it delivered through the skin. Interestingly enough, they found approximately 90% absorption of hormone. 

Related Resources

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