Equol and menopause: the soy compound half of us can't make
If you are somewhere in your forties or fifties and the heat arrives out of nowhere, at your desk, at two in the morning, that is not you being dramatic. Your estrogen is dropping away and your body is noticing.
The advice you will hear is to eat more soy. That is not bad advice, but it skips a step, and the step turns out to be the whole story.
What is equol?
Equol is not something you eat. It is something your gut makes.
When you eat tofu, soy milk or natto, which is Japan's fermented soybean breakfast staple, certain bacteria in your gut can take one of the compounds in soy and turn it into equol. Equol is closely related to the natural compounds in soy, and it is the form researchers have looked at most closely when studying women going through menopause. That is why it comes up so often in this conversation.
So when people talk about the soy habit, a lot of what they are really talking about is equol. And it depends on a conversion happening inside you.
Why can't everyone make it?
Because it depends on having the right gut bacteria, and not everyone does.
In Asian populations, research puts equol producers at roughly half to sixty percent of adults. In Western populations it is closer to a quarter to a third. Researchers point mostly to gut bacteria, shaped by diet, though genes appear to play a part too.
Which means two women can eat exactly the same tofu and get different results, and neither would ever know why. If you are not a producer, the soy passes through and the equol never arrives. That is what the eat-more-soy advice misses. You cannot eat your way to a compound your gut will not make.
This is also why equol supplements exist at all. They skip the gut bacteria and give you the finished compound directly.
What does the research actually show?
Honest answer: promising, and not settled.
Most of the research looks at women who cannot make their own equol and gives it to them directly. The published work is what it is: some of it comes from authors affiliated with the company that sells it, the studies are mostly small, and nobody serious calls the picture settled. (Aso et al., Journal of Women's Health.)
It is not a replacement for talking to your doctor, and if this is affecting your life, that is the conversation worth having first.
How much equol do you actually need?
The trials that found anything used 10mg of equol a day, or more. Higher amounts have been tested too, and on some measures they did better. 10mg is the floor, not the target.
The one study that compared amounts head to head gave women 2mg, 6mg or 10mg a day. Only the 10mg group showed the effect. It was a small study, so it cannot prove that 2mg does nothing. What it does mean is that nobody has shown a smaller amount doing anything at all.
So the number on the label is worth your attention. Equol supplements vary a great deal, and some carry a small fraction of what the research was built on. A pack can be perfectly genuine and perfectly well made, and still be a very different amount from what was studied.
If you try equol, turn the pack over and find the milligrams. If it does not say, that is an answer too.
One to look for
Otsuka EQUELLE
From Otsuka, a Japanese pharmaceutical company. Soy germ is fermented with lactic acid bacteria, which does outside your body what your gut may not do inside it.
Four tablets a day gives you 10mg of S-equol, which is the form your gut would otherwise have made. That is the amount the studies were built on. One bottle holds 112 tablets, which is 28 days.
Contains soy. Otsuka is careful about its own wording, and so are we: the company says its clinical work was used to set the daily amount, not to prove a benefit.
The plain version
Roughly half of us can turn soy into equol. The other half cannot, and no amount of tofu changes that. If you are in the second group, the only way to get equol is to take it directly. And if you do, take the amount the research used, because the one study that compared amounts only saw an effect at 10mg.
Want EQUELLE from Japan? We buy it new in Japan and ship it to you. One bottle is 28 days. Message us with the word EQUELLE and we will quote you. Note that Otsuka sells the 120 tablet pouch only through clinics and pharmacies, and has published a warning about counterfeit pouches on marketplaces. The 112 tablet bottle we source is ordinary retail stock, bought from Japan.
This is a food supplement, not medicine. Follow the serving on the pack. It contains soy. Not for pregnant or breastfeeding women. If you are on medication or seeing a doctor about hormones, ask them first.
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