Hormones are vital chemical substances in humans and animals. They are often referred to as “chemical messengers” since they carry information and instructions from one group of cells to another.

In the human body, hormones influence almost every cell, organ and function. They regulate our growth, development, metabolism, sexual function, tissue function, reproduction, the way our bodies use food, our moods, and of course, breast growth.

Our bodies make and use lots of hormones, but the most crucial hormones for breast growth are:


Estrogen is hands down the most well-known hormone and its small wonder why – this is one important hormone. It’s called the female hormone because not only is it the main sex hormone in women, but it’s also essential the menstrual cycle and the hormone hugely responsible for growing all the body parts mentioned in My Humps.

Estrogen is first released by our ovaries sometime between 9 to 14 years old, which is when most of us experience our first growing pains. And not just the breasts, either – estrogen’s also responsible for widening the hips and increasing fat storage on the butt, thighs and hip region. It also contributes to the relative hairless-ness of women compared to men.

In essence, estrogen is what “makes” us women.

But that doesn’t mean only women produce estrogen – men do too, but it is found in higher amounts in women, especially women capable of reproducing.

It’s important to note that estrogen is actually not a single hormone – it’s an umbrella term that includes a group of chemically similar hormones, including estrone, estradiol, and estriol.

Estradiol, which is most abundant in women of reproductive age, is the strongest of the estrogen

hormones and the one most responsible for breast development.

  • Estradiol is made from the ovaries, and it gives women their curvy appearance.
  • Estrone is made from body fat.
  • Estriol is present in small amounts and is mostly made during pregnancy.


Progesterone is not as well-known as estrogen, although it’s just as important – it works alongside estrogen to maintain female reproductive health, increase fat storage and stimulates fatty tissue growth. Progesterone (along with prolactin) is also hugely responsible for the development of the mammary glands in the breast.

Our bodies start producing progesterone a little later than estrogen – it’s only once we begin ovulating – after around 2 years of menstruation (around age 14 – that progesterone levels begin to rise in our bodies.

That’s why progesterone is primarily known as the “pregnancy hormone” – it’s produced just before ovulation in order to enhance the possibility of becoming pregnant. The average levels of progesterone during the full monthly cycle are quite low – they only begin to rise two weeks before menstruation and are at their highest during the week before menstruation begins.

Men also produce a small amount of progesterone, but it is less important to sexual maturity in men than is testosterone.


Your body generally only secretes prolactin during two specific phases in your life: puberty and pregnancy. But because it plays such an important role in breast development – prolactin is one hormone you should definitely get to know.

During puberty, prolactin works alongside estrogen to develop the mammary glands while simultaneously increasing the number of estrogen receptors in the breasts (which is what make it possible for estrogen to do its thing).

But even more importantly, prolactin also stimulates your breasts to store fat by increasing the production of lipoprotein lipase (LPL) in your breasts, which is an enzyme that works to store fat. Considering the breasts are primarily composed of fat – having adequate prolactin levels is crucial to breast growth.

At the onset of pregnancy, estrogen and progesterone enlarge and develop the breast – prolactin comes into the picture around the eight week of pregnancy and peaks at birth. It is the hormone most involved in nursing since it controls the production of milk.

After that, prolactin is produced by stimulation – like, when a baby suckles at your nipple. But interestingly – you don’t have to be pregnant or nursing to produce prolactin. One fun way to get an instant boost is by having an orgasm. Another is with nipple stimulation, which you can do specifically (;)) or with breast enhancement massages.

Human Growth Hormone

HGH is aptly named – it’s the “growth” hormone because it stimulates the growth of the entire body – cells, tissues, cartilage, etc. It’s made up of 191 amino acids and is critical for everything from tissue and muscle growth to energy and metabolism. The fact that HGH is what allows our cells and tissues to grow is a huge part of why HGH is so crucial for breast growth.

It’s the hormone that’s hugely responsible for the growth spurts we went through in our younger years – especially our teens (that’s when HGH is at its peak level in our bodies).

But its function doesn’t stop there. HGH is doubly crucial for breast growth because our livers convert it into a new, more usable substance known as Insulin Growth Factor (IGF), which plays a key role in growing bigger breasts. You see, as important as HGH is, it does not last long in our bloodstream. In just a few short minutes our liver absorbs HGH and converts it into growth factors. IGF-1 is the most important growth factor that is produced and it is a hormone just like

HGH, but it is easier to measure in the body because it stays in our bloodstream longer than HGH. You can think of HGH as the hormone that gets the ball rolling, but IGF-1 does most of the work.

Growth hormone is so important that it is one of your body’s most plentiful hormones – it can be thought of as your body’s “Master Hormone” since it regulates every other hormone you’ve got.

Sadly, growth hormone levels decline as you get older and really start to plummet after the age of thirty. By the time you reach sixty, your growth hormone levels are close to 75% lower than they were when you were twenty.

You may have had plenty of it at your disposal during puberty, but if you’re older than eighteen – you’re going to have to raise it up to get your breasts growing again. The good news is that there are easy ways to boost your HGH levels and I’m going to show you exactly how to do it.


It’s commonly known as a male hormone, but just as men also have estrogen and progesterone produced in their bodies at a smaller amount than women – women also produce smaller amounts of testosterone.

Just as it’s important to keep the levels of the above, breast-growth-enhancing hormones high

– It’s equally crucial to keep levels of breast-growth-blocking testosterone low, especially if your testosterone levels are already high or if you are a biological male. Thankfully, this is easy to do

– You’ll find out all about it.

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