Daidzein supplement information, health benefit, anti cancer effect - does it influence DHT levels? Conversion into equol and review of published clinical trials by Ray Sahelian, M.D.
Daidzein is an isoflavone found in soy.
Isoflavones are types of
flavonoids found in plants. The main sources for
isoflavones are soy products, beans, peas, nuts, grain products, coffee, tea and certain
herbs such as red clover.
Genistein is one of the best known and studied isoflavones.
Other isoflavones include aglycon, glucoconjugate and
equol. A plant in the news
lately that
has daidzein is Kudzu which has been found to have beneficial effects in those who drink alcohol more than
they should. There is also a prostate
formula with daidzein, for more information regarding this formula see
Prostate Power Rx.
Daidzein has been shown in laboratory studies to have several
properties:
Anti-tumor
activity, including prostate, colon, pancreas, cervix, and breast.
Weak
pro-estrogen and anti-estrogen activity which may be helpful in
postmenopausal women.
It is metabolized in the
colon by bacteria to equol, another isoflavone.
Purchase Daidzein and Genistein
pills, Isoflavones, 1000 mg each pill
Source Naturals

Studies have shown that genistein and daidzein can bind to the same receptor sites as estrogen.
Soybeans are significant dietary source of isoflavones; however, the
amount of soy foods necessary to meet the body's needs can be difficult to
incorporate into today's diet. In Asia, where soy is a staple, the daily
intake of isoflavones can be up to 20 times that of a Western diet. Source
Naturals Genistein and Daidzein are made from isoflavone-rich soybean
powder that yields a consistent standardized isoflavone content. This
unique chemical-free process requires approximately 400 pounds of soybeans
to yield just one pound of finished product.
Purchase Daidzein Genistein, or Prostate Power Rx
Supplement Facts:
Serving Size 2 Tablets
Amount Per Serving:
Calories 10
Sodium 5 mg
Total Carbohydrates 1 g
Protein 1 g
Isoflavone Rich powder 2 grams
Soybean Powder (Soylife) Yielding:
Daidzein - 34 mg
Glycitein - 20 mg
Genistein - 8 mg
Total Isoflavones - 62 mg
Suggested Use: Two daidzein - genistein tablets, twice daily with a meal, or as recommended by
your health care professional.
Prostate Power
Rx

With saw palmetto, pygeum, stinging
nettle, quercetin, daidzen extract and several key Ingredients for support of optimal prostate health. This
formula has been designed to support:
• Normal prostate size
• Cellular support against oxidants in the prostate
Ingredients:
Saw Palmetto
extract (standardized to contain 45% fatty acids - serenoa repens fruit)
Stinging Nettle
4:1 extract (urtica diocia root)
Quercetin
flavonoid
Rosemary 4:1 extract (Rosemarinus officinales leaf)
Beta Sitosterol
Pygeum 4:1 bark extract (Pygeum Africanum)
Daidzein (standardized to contain 40% isoflavones)
Genistein (standardized to contain 40% isoflavones)
Lycopene (Lycoperscion escatatum fruit)
Benefit
Future research is likely to uncover various benefits of this substance.
Breast cancer
Daidzein induces MCF-7 breast cancer cell apoptosis via the mitochondrial
pathway.
Ann Oncol. 2010
We demonstrated that daidzein-induced
apoptosis in MCF-7 cells was initiated by the generation of reactive oxygen
species (ROS). Furthermore, we showed that this
was accompanied by disruption of mitochondrial transmembrane potential,
down-regulation of bcl-2, and up-regulation of bax, which led to the release of
cytochrome C from the mitochondria into the cytosol, which, in turn, resulted in
the activation of caspase-9 and caspase-7, and ultimately in cell death. Daidzein could induce breast cancer cell apoptosis through the
mitochondrial caspase-dependent cell death pathway.
The soy isoflavone daidzein improves the capacity of tamoxifen to
prevent mammary tumours.
Eur J Cancer. 2005.
This study conclusively shows for the first time the
combination of daidzein with tamoxifen produces increased protection
against mammary carcinogenesis, while the combination of genistein with
tamoxifen produces an opposing effect when compared with tamoxifen alone.
Hair growth?
Does daidzein help with
hair growth?
Theoretically it may since it converts into equol
but what actually happens when ingested by humans for prolonged periods is
difficult to predict.
Chemistry
Side effects, safety, risk,
danger
No major adverse effects have been mentioned in the medical literature.
Daidzein research studies
Gut bacterial metabolism of the soy isoflavone
daidzein: exploring the relevance to human health.
Exp Biol Med. 2005.
Fred Hutchinson Cancer Research Center,
Seattle, WA
The indigenous intestinal microflora are involved in a variety of
processes within the human body, and are important for maintaining host
health. As such, interindividual differences in the ability to harbor
certain intestinal bacteria might be associated with interindividual
differences in health and/or disease susceptibility. Daidzein, an isoflavone phytoestrogen found in soy, is
metabolized to equol and O-desmethylangolensin (O-DMA) by intestinal
bacteria. The specific bacterium/bacteria responsible for equol and O-DMA
production in humans have yet to be identified definitively, but in vitro
and animal studies have suggested that equol and O-DMA are more
biologically active than their precursor daidzein. Interestingly,
substantial interindividual differences in daidzein metabolism exist;
following soy or daidzein consumption, approximately 30%-50% of the human
population produce equol, and approximately 80% to 90% produce O-DMA.
Observational and intervention studies in humans have suggested that the
ability to produce equol and O-DMA may be associated with reduced risk of
certain diseases including breast and prostate cancers.
Soy isoflavone phyto-pharmaceuticals in interleukin-6 affections;
Multi-purpose nutraceuticals at the crossroad of hormone replacement,
anti-cancer and anti-inflammatory therapy.
Biochem Pharmacol. 2004.
Interleukin-6 is a cytokine which plays a crucial role in
immune physiology and is tightly controlled by hormonal feedback
mechanisms. After menopause or andropause, loss of the normally inhibiting
sex steroids (estrogen, testosterone) results in elevated IL6 levels that
are further progressively increasing with age. Interestingly, excessive
IL6 production promotes tumorigenesis (breast, prostate, lung, colon,
ovarian), and accounts for several disease-associated pathologies and
changes of advanced age, such as osteoporosis, rheumatoid
arthritis, multiple myeloma, neurodegenerative diseases and frailty. In
this respect, pharmacological modulation of IL6 gene expression levels may
have therapeutic benefit in preventing cancer progression, ageing
discomforts and restoring immune homeostasis. Over the last few decades,
various immune-modulating nutrients have been identified, which interfere
with IL6 gene expression. Currently, a broad range of phyto-pharmaceuticals
with a claimed hormonal activity, called "phyto-estrogens", is recommended
for prevention of various diseases related to a disturbed hormonal balance
(i.e. menopausal ailments and/or prostate/breast cancer). In this respect,
there is a renewed interest in soy isoflavones (genistein, daidzein,
biochanin) as potential superior alternatives to the synthetic selective
estrogen receptor modulators (SERMs), which are currently applied in
hormone replacement therapy.
Equol, a metabolite of daidzein, inhibits bone
loss in ovariectomized mice.
J Nutr. 2004.
Our
results suggest that equol inhibits bone
loss apparently without estrogenic activity in the reproductive organs of
mice without ovaries.
Effect of daidzein on cell growth, cell cycle, and telomerase activity of
human cervical cancer in vitro.
Int J Gynecol Cancer. 2004.
Phytoestrogens are some plant compounds exhibiting estrogen-like
activities. However, some studies have shown that they also affect the
growth of some nonhormone-dependent diseases. In this study, daidzein--one
of the most common phytoestrogens--was used to investigate its effects on
human cervical cancer cells HeLa in vitro. The inductive effects of
apoptosis were more obviously observed in low-concentration groups. After
HeLa cells were treated with daidzein, the expression of human telomerase
catalytic subunit mRNA decreased. These meant that daidzein affected human
nonhormone-dependent cervical cancer cells in several ways, including cell
growth, cell cycle, and telomerase activity in vitro.
Daidzein together with high calcium preserve bone
mass and biomechanical strength at multiple sites in ovariectomized mice.
Department of Nutritional Sciences, Faculty of Medicine, University of
Toronto, Toronto, ON
The objective of this study was to determine the
effects of purified daidzein in combination with high calcium (Ca) on
preserving femur and lumbar vertebrae (LV1-LV4) bone mineral density (BMD)
and biomechanical bone strength at three different sites (femur midpoint,
femur neck and LV3) in ovariectomized mice. The results from this study
suggest that the combination of daidzein and high Calcium favorably affect
cortical and trabecular bone as indicated by femur and lumbar vertebrae
BMD and biomechanical strength but much of this effect is mediated by the
high Calcium diet. Further investigation is required to determine optimal
dietary levels of daidzein and Ca with the long-term goal of developing a
dietary strategy to prevent postmenopausal osteoporosis and related
fragility fractures.
Clinical Characteristics and Pharmacokinetics of
Purified Soy Isoflavones: Multiple-Dose Administration to Men with
Prostate Neoplasia.
Nutr Cancer. 2004.
A phase I clinical trial was conducted to determine the safety,
pharmacokinetic parameters, and efficacy of orally administered
isoflavones (genistein and daidzein, potential cancer chemotherapeutic
agents) over a 3-mo period in men with prostate neoplasia. Twenty men,
ages 40 and above, with stage B, C, or D adenocarcinoma of the prostate
were treated with a multiple-dose regimen of a soy isoflavone formulation
(delivering approximately 300 or 600 mg/day genistein and half this much
daidzein) for 84 days. The delivered dose of isoflavones was more than
10-fold higher than that typically taken by prostate cancer patients. In
men with prostate cancer, relatively minor side effects of chronic
isoflavone treatment were observed including some estrogenic effects
(breast changes, increased frequency of hot flashes). Serum
dehydroepiandrosterone was decreased by 31.7% (P = 0.0004) at the end of
treatment. Except for those subjects whose prostate-specific antigen (PSA)
values were below 0.4 ng/ml, subjects had a history of increasing PSA
levels prior to the trial. This increase continued during the trial both
while on soy isoflavones and after treatment was discontinued. On average
the rate of rise accelerated after soy isoflavones were discontinued, but
that difference did not attain statistical significance. Genistein and
daidzein were rapidly cleared from plasma and excreted in urine.
Pharmacokinetic data for chronic dose administration were similar to
single-dose administration for the isoflavones investigated except that we
observed slightly longer circulation time for daidzein.
Metabolism of daidzein by intestinal bacteria
from rhesus monkeys (Macaca mulatta).
Comp Med. 2004.
The metabolism
of daidzein by the fecal bacteria of nine monkeys was investigated.
Daidzein was incubated anaerobically with fecal bacteria, and the
metabolites were analyzed by use of liquid chromatography and mass
spectrometry. The fecal bacteria of all of the monkeys
metabolized daidzein to various extents. Dihydrodaidzein was found in
cultures of fecal bacteria from two monkeys; dihydrodaidzein and equol
were found in cultures from four monkeys; dihydrodaidzein, equol, and an
unknown metabolite (MW = 244) were found in cultures from one monkey; and
dihydrodaidzein and the unknown metabolite were found in cultures from two
monkeys. Similar to that in humans, variation was evident in
the metabolism of isoflavonoids by fecal bacteria from rhesus monkeys.
Some metabolites produced by fecal bacteria from monkeys were the same as
those produced by fecal bacteria from humans.
Dietary phytoestrogen intake and premenopausal
breast cancer risk in a German case-control study.
Int J Cancer. 2004.
A diet high in isoflavonoids is associated with lower breast cancer
risk in Asian populations. Due to the low soy intake, dietary lignans may
be the more important phytoestrogen class in Western populations. We used
a population-based case-control study of breast cancer by age 50 in
southern Germany to evaluate the association between dietary intake of
different phytoestrogens and premenopausal breast cancer risk. Our results suggest an important role of dietary
intake of daidzein and genistein, despite low levels, as well as of
matairesinol and mammalian lignans to reduce premenopausal breast cancer
risk in this study population.
Emails
Q. Is there a way to test if you are an equol producer? I'm
an average Joe taking red clover twice a day (for hair loss) but also for
prostate health. I would like to know if it's beneficial to me to keep
taking this. Also, after reading a couple of the daidzein articles, I
believe I have experienced my first "hot flash" the other night. It felt
as though I was going to be sick, I got real hot then sweat on my
forehead. I just thought I had caught a touch of the flu. Anyhow, I'm now
thinking that I had a hot flash, because I'm taking too much daizden? hard
to say, there aren't any guidelines for how much to take. Are the "herbal"
drug companies any closer to creating an over the counter equol supplement
so us thinning hair people can combat male pattern baldness?
A. You ask good questions and we just don't have enough knowledge at this
time to make any firm recommendations.
I would like to purchase isoflavone supplements. Just
diagnosed with low grade prostate cancer but how do I know If I can metabolize
diadzin to equol? Are there labs that can do this?
This kind of evaluation is not routinely available to a
patient, it is still specialized study mostly used by researchers.
Kudzu Recovery, 750 mg, 120 Tabs
Planetary Formulas
Botanical Support for Alcohol Cessation
Kudzu Recovery
herbal supplement
features the roots and flowers of kudzu (Pueraria lobata), which
have long been used in Chinese herbal medicine to help lessen the desire for
alcohol. Researchers have identified two constituents in kudzu responsible for
this activity, puerarin, daidzein and daidzin, which in animal research have
been found to cause a similar effect. These are combined with coptis, a primary
cleansing and liver-supporting herb from Chinese herbalism, and other key
botanicals to support botanicals historically used to reduce cravings.
Lifestyle Recommendations: To decrease cravings, maintain adequate caloric
intake by eating regularly scheduled meals, avoid simple sugar, and supplement
with chromium and B-complex vitamin. Avoid excess stress, exercise regularly,
and promote a calm mental state of well-being.
Kudzu root, Kudzu flower, Hovenia fruit,
Coptis chinensis root,
Poria Cocos sclerotium,
Grifola sclerotium, Atractylodes root,
Codonopsis root, Saussurea root, Shen
Qu-Massa Fermentata extract, Green Citrus peel,
Cardamom fruit and
Ginger root.