Dioscorea villosa, commonly known as wild yam, is a tuberous vine native to North America and parts of Central America. It was used by the Mayan and Aztec civilizations for pain relief and birth control and has also been given the names colic root and rheumatism root, demonstrating this early use of the plant. However, whether it is nature's progesterone or not is another question that requires close analysis.

These Central American civilizations, of course, did not understand the reason why they were effective. Some of the symptoms treated can be caused by the menopause, and the wild yam is believed to contain natural forms of progesterone that can alleviate some of the adverse effects of the menopause on the body. Like most plants, they also likely act as anti-inflammatories, so relieving the pain of rheumatoid arthritis and other inflammatory conditions.

Like any natural remedy, wild yam had its adherents and its detractors, though in recent years the plant has been used as the raw material for the production of cortisone and a form of progesterone: or at least so it is claimed, so let's have a closer look at these claims and determine whether or not wild yam is indeed nature's progesterone.

The human body uses organic compounds called hormones to regulate many of the chemical activities of the body. The hormones catalyze the chemical reactions and changes needed for the proper functioning of our bodies. Hormones are produced in small chemical factories dotted throughout our body called glands. Each gland is devoted to producing a specific hormone, or a range of them, and each hormone is designed for a specific purpose.

Each has an associated hormone 'receptor' at their targeted destination that fits the hormone like a jigsaw piece. When it turns up, the hormone attaches to the receptor and the reaction proceeds. That might be the initiation of energy production in cells, the activation of certain genes or even the stimulation of hair growth by the follicles or of the libido and the natural desire to procreate.

Hormones are manufactured from only three constituents: proteins, amino acids and cholesterol, and the steroidal sex hormones are created from cholesterol. Therefore, don't reduce your cholesterol level too much!

Prior to puberty, all of the sex hormones are manufactured by the adrenal glands, and after puberty by the ovaries in women and the testes in men. Progesterone is produced initially, and is then used as the building block for all the other sex hormones (hence the prefix 'pro'). In women these are the estrogens and in males the androgens. Progesterone is made from the start of the menstrual cycle, and after day 12 they have reached a high enough level to halt ovulation. Progesterone levels continue to rise for about 8 days, and then if fertilization has not occurred, the progesterone levels trigger menstruation, and the lining of the womb is detached and expelled.

During certain phases of the menstrual cycle, the levels of the hormones estrogen and progesterone drop off, although the exact reason for the many and varied symptoms of pre-menstrual syndrome (PMS) are still unknown to a large extend. There appear to be several contributing factors, though estrogen and progesterone certainly appear to be two of the major ones. We shall concentrate here on the progesterone factor because that is what wild yam is claimed to address.

Although the main function of progesterone is to generate estrogen and testosterone, to restore the libido after menstruation, and maintain the integrity of the lining of the uterus and aid in gestation, it has many other purposes such as in thermogenesis (burning of body fats), protection against osteoporosis and is also believed to have a natural anti-depressant action. These are all supported by the symptoms that appear when the body is low in progesterone levels: depression, sudden increase in body fat, mood swings, loss of sex drive and a susceptibility to weak bones if the deficiency is long-term.

In other words, women that usually suffer from PMS, also generally suffer low progesterone levels. It is believed in some quarters that a progesterone deficiency causes an excess of estrogen that leads to these symptoms in addition to heart disease. No one really knows for sure, but a deficiency of progesterone seems to be the determining factor.

Women with menstrual problems continue to be issued with prescribed synthetic progesterone even though they do not have the same effect as natural progesterone. They can also lead to some unpleasant side effects such as fluid retention, strokes, jaundice, blood clots and depression: some of the symptoms it is intended to alleviate. Some take borage or evening primrose oil for the GLA that helps some of the effects, but this is taken to counter the over-production of the hormone prolactin in some women prior to menstruation, not a deficiency of progesterone.

Wild yam does not cause these symptoms, and is claimed by many to be very effective in alleviating the symptoms of PMS. The problem with the artificial forms of progesterone is that the liver's job is to destroy foreign hormones, and send them to the digestive tract for expulsion. Natural hormones are not affected in this way, even if they come from a non-human source.

The chemical diosgenin in wild yam is very similar in structure to progesterone, and is believed to be the active principle. It is claimed that it can be used to produce not only progesterone but also other related hormones. However, some medical authorities and practitioners dispute this claim, and there is still a question as to how wild yam works. Because it does work, many people swear by it and claim that they could not live without it.

This is especially true of those that suffer from the more severe effects of PMS, and since wild yam does not work for everybody, it could be connected with the severity of the condition and the symptoms. Whichever is true, there appears to be little doubt in the eyes of those that use it as a cream that wild yam is indeed nature's progesterone.