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The Importance of Progesterone

I must say that it feels somewhat crazy to be writing 2015 on my documents. How is that possible?

And how are you doing in this New Year? We can come up with many great intentions, but the important ones are those that stick – the intentions that we make into habits and life style changes that really benefit us. A patient recently noted that we know that we need to do certain things and yet have to ask ourselves “Why don’t I put this in place?”

Here’s to putting in place in 2015 the top actions that will create the best health and vitality we can. Now let me talk about one specific factor.



This hormone is primarily made in the ovaries of women and testicles and adrenals of men. It has several important functions for each sex.

For women, one of the important roles of progesterone is in balancing estrogen effects on the uterus, keeping the lining from overgrowing and causing the shedding during the menstrual cycle.

During the first 2 weeks after menses, progesterone is produced in very small amounts. When an egg is released at ovulation (about 2 weeks into the cycle), progesterone production really begins and continues for approximately 2 weeks while estrogen is high, exerting a balancing effect. Near the end of that time, both hormones begin declining, sometimes rapidly (causing more symptoms) and other times more gradually until they are both at very low levels and the next menses ensue.

Progesterone is essential for creating a thickened uterine lining that can receive a fertilized egg, thus creating a viable pregnancy. One of its important jobs is to prevent excess estrogen, and inadequate progesterone can result in a miscarriage. Any young woman planning to get pregnant should make sure that she has healthy progesterone levels. It is one important factor in determining fertility.


Progesterone also has a major effect on mood.

During the 2 weeks leading up to a menstrual cycle it is extremely important that the body is producing adequate amounts. Low progesterone can lead the way to estrogen dominance, which creates PMS symptoms and emotional imbalance. The more infrequently a woman ovulates, the less progesterone she is producing.


But progesterone plays other important roles in our bodies, too.

Progesterone is a critical factor in maintaining brain function including good cognition and memory. In both sexes, progesterone has positive effects on neurons and helps to regulate neurotransmitters, such as dopamine and GABA (associated with learning, memory and a sense of calmness. It is a natural anti-depressant. Scientists are currently looking at progesterone replacement to aid in the prevention of memory loss.


Progesterone has shown beneficial effects when administered immediately after strokes and heart attacks to help reduce global cerebral ischemia.

In these events, the lack of oxygen to the brain has negative effects on memory and cognitive function. The use of progesterone in these circumstances has been demonstrated to reduce the narrowing of the brain’s memory center, the hippocampus.

Furthermore, progesterone is required for healthy bone development and preservation, and plays a significant role in the prevention of osteoporosis. Healthy sleep patterns also depend on progesterone levels to a major degree with its effects on neurotransmitters of several types.

It also plays a direct role in maintaining good bladder function, acting as a natural diuretic to regulate fluid balance. Progesterone provides healthiness to hair, skin, and nails, and helps prevent hair loss. It protects against endometrial cancer, prostate cancer, and fibrocystic breast disease. Blood sugar and insulin levels are better regulated in both men and women when progesterone is optimal. The thyroid function is directly affected by progesterone levels, so it naturally follows that temperature regulation is supported by this hormone.


It is a misconception that a hysterectomy eliminates the need to give progesterone even when estrogen is replaced through hormone therapy.

Although this surgery clearly makes the effect of progesterone on the now missing uterus lining irrelevant, it fails to take into consideration all the other functions of progesterone in the body. During a hysterectomy, the receptors for progesterone on every cell of the body are not removed! They are still there and need progesterone to create the physiologic balance they influence.

In short, progesterone affects nearly every part of our body. It can be taken as capsules orally without negative effects by most people, under the tongue in the form of rapid dissolve tablets, or as suppositories or creams in the vagina. Because of specific molecular aspects of progesterone and the variation in patients’ skin absorption, topical application may not be the best delivery method for consistency in dosing.


All said, progesterone affects nearly every part of your body and is a very important hormone in ensuring our well-being.

In balance and good health in 2015!